Execute command when a file changes

The name of the pictureThe name of the pictureThe name of the pictureClash Royale CLAN TAG#URR8PPP












9















I have a scenario where I am uploading .csv files to a specific folder, /tmp/data_upload, every day, and the old files are replaced by the new one.



I need to run a Python script once the data is uploaded. For this, I have an idea to create a cron job and monitor the changes in the file. I tried using inotify, but I am not much into the Unix domain. How can I do that?



I need to execute the script test.py once there is a date change of a file in the upload folder, for example, /tmp/data_upload.










share|improve this question
























  • Have you looked at eradman.com/entrproject , haven't tried it myself but it looks like it may be related.

    – O.O.
    Jan 7 at 11:57











  • FYI, Python has inotify libraries available. See one of my answers here for an example: askubuntu.com/a/939392/295286

    – Sergiy Kolodyazhnyy
    Jan 8 at 2:11















9















I have a scenario where I am uploading .csv files to a specific folder, /tmp/data_upload, every day, and the old files are replaced by the new one.



I need to run a Python script once the data is uploaded. For this, I have an idea to create a cron job and monitor the changes in the file. I tried using inotify, but I am not much into the Unix domain. How can I do that?



I need to execute the script test.py once there is a date change of a file in the upload folder, for example, /tmp/data_upload.










share|improve this question
























  • Have you looked at eradman.com/entrproject , haven't tried it myself but it looks like it may be related.

    – O.O.
    Jan 7 at 11:57











  • FYI, Python has inotify libraries available. See one of my answers here for an example: askubuntu.com/a/939392/295286

    – Sergiy Kolodyazhnyy
    Jan 8 at 2:11













9












9








9


2






I have a scenario where I am uploading .csv files to a specific folder, /tmp/data_upload, every day, and the old files are replaced by the new one.



I need to run a Python script once the data is uploaded. For this, I have an idea to create a cron job and monitor the changes in the file. I tried using inotify, but I am not much into the Unix domain. How can I do that?



I need to execute the script test.py once there is a date change of a file in the upload folder, for example, /tmp/data_upload.










share|improve this question
















I have a scenario where I am uploading .csv files to a specific folder, /tmp/data_upload, every day, and the old files are replaced by the new one.



I need to run a Python script once the data is uploaded. For this, I have an idea to create a cron job and monitor the changes in the file. I tried using inotify, but I am not much into the Unix domain. How can I do that?



I need to execute the script test.py once there is a date change of a file in the upload folder, for example, /tmp/data_upload.







linux unix cron automation inotify






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Jan 7 at 17:45









Peter Mortensen

2,11742124




2,11742124










asked Jan 7 at 8:29









AlexAlex

463




463












  • Have you looked at eradman.com/entrproject , haven't tried it myself but it looks like it may be related.

    – O.O.
    Jan 7 at 11:57











  • FYI, Python has inotify libraries available. See one of my answers here for an example: askubuntu.com/a/939392/295286

    – Sergiy Kolodyazhnyy
    Jan 8 at 2:11

















  • Have you looked at eradman.com/entrproject , haven't tried it myself but it looks like it may be related.

    – O.O.
    Jan 7 at 11:57











  • FYI, Python has inotify libraries available. See one of my answers here for an example: askubuntu.com/a/939392/295286

    – Sergiy Kolodyazhnyy
    Jan 8 at 2:11
















Have you looked at eradman.com/entrproject , haven't tried it myself but it looks like it may be related.

– O.O.
Jan 7 at 11:57





Have you looked at eradman.com/entrproject , haven't tried it myself but it looks like it may be related.

– O.O.
Jan 7 at 11:57













FYI, Python has inotify libraries available. See one of my answers here for an example: askubuntu.com/a/939392/295286

– Sergiy Kolodyazhnyy
Jan 8 at 2:11





FYI, Python has inotify libraries available. See one of my answers here for an example: askubuntu.com/a/939392/295286

– Sergiy Kolodyazhnyy
Jan 8 at 2:11










4 Answers
4






active

oldest

votes


















10














You might need incrond (inotify cron daemon) which will monitors changes on files and then execute scripts.



Incrond can monitor add new file, modify, delete and many more. This is an article shows what event incrond can monitor with some example.



Example for your case, you might create the file /etc/incron.d/data_upload with the contents



/tmp/data_upload IN_CREATE,IN_MODIFY /path/to/test.py 





share|improve this answer




















  • 2





    Whilst this may theoretically answer the question, it would be preferable to include the essential parts of the answer here, and provide the link for reference.

    – Gerald Schneider
    Jan 7 at 9:10











  • Thanks for reminding me, I have added the context for the link.

    – victoroloan
    Jan 7 at 9:19












  • Thanks for the answer, just to verify the steps after installing incrontab shoudl execute incrontab -e as root then include this line /tmp/data_upload IN_CREATE,IN_MODIFY test.py ? so that to check once I upload a new file it should execute the test.py file ? where should I place the test.py file ? should i need to provide absolute path for this ?

    – Alex
    Jan 7 at 9:56






  • 1





    I think, It will be better to put the absolute path for your script. You can also check cron or system log if the script seems not working

    – victoroloan
    Jan 7 at 10:18












  • Can you also document what file you are referring to with your code block, people who are not familiar with the syntax of Incrond (like me) may think are referring to a command that you have to execute on the command line

    – Ferrybig
    Jan 7 at 15:08


















1














You could use entr to automatically run the script everytime a file changes by running ls /tmp/data_upload | entr -p script.py once at startup.



Project website: http://eradman.com/entrproject/



Online man page: https://www.systutorials.com/docs/linux/man/1-entr/






share|improve this answer






























    0














    The watchexec (https://crates.io/crates/watchexec) command line utility sounds like exactly what you need, although I believe to install it you'd need to have the Rust build tools installed on your machine, so that may be a dealbreaker






    share|improve this answer























    • I love using software written in rust because you know it wasn't abandoned in 2004 or something. It almost has to be new.

      – Nathaniel Pisarski
      Jan 8 at 2:25


















    0














    My general approach would be to fiddle with the classical Unix find utility. For example, the command



    find /tmp/upload_data/*.csv -mtime -1 -exec /home/myname/test.py


    will find any .csv files in /tmp/upload_data that have been modified less than one day ago, and run your test.py if it finds any. Of course, if your test.py file is in some other directory, you want to update your path to it accordingly.



    If you run your cron job more often than once a day, you can use the mmin option to find to specify the maximal time since modification in minutes. For example,



    find /tmp/upload_data/*.csv -mmin -60 -exec /home/myname/test.py


    will search for .csv files that were modified less than 60 minutes ago -- useful if cron runs the job hourly.



    Two fair warnings are in order: First, this won't catch .csv files that you entirely deleted. You may want to check for these separately. Second, I did not have time to test any of this. Expect typos in my code that you'll have to debug by yourself.






    share|improve this answer




















    • 1





      What is the -cmd syntax? IIRC find takes -exec cmd ;...

      – D. Ben Knoble
      Jan 8 at 4:28











    • I have tried this one before posting this question ,this is not working properly on 2nd 3rd consecutive run of cron jobs

      – Alex
      Jan 8 at 7:31











    • @D. Ben Knoble: You're right. I mixed up find-internal commands with shell commands. Fixed. Thanks for the correction!

      – Thomas Blankenhorn
      Jan 8 at 8:37











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    4 Answers
    4






    active

    oldest

    votes








    4 Answers
    4






    active

    oldest

    votes









    active

    oldest

    votes






    active

    oldest

    votes









    10














    You might need incrond (inotify cron daemon) which will monitors changes on files and then execute scripts.



    Incrond can monitor add new file, modify, delete and many more. This is an article shows what event incrond can monitor with some example.



    Example for your case, you might create the file /etc/incron.d/data_upload with the contents



    /tmp/data_upload IN_CREATE,IN_MODIFY /path/to/test.py 





    share|improve this answer




















    • 2





      Whilst this may theoretically answer the question, it would be preferable to include the essential parts of the answer here, and provide the link for reference.

      – Gerald Schneider
      Jan 7 at 9:10











    • Thanks for reminding me, I have added the context for the link.

      – victoroloan
      Jan 7 at 9:19












    • Thanks for the answer, just to verify the steps after installing incrontab shoudl execute incrontab -e as root then include this line /tmp/data_upload IN_CREATE,IN_MODIFY test.py ? so that to check once I upload a new file it should execute the test.py file ? where should I place the test.py file ? should i need to provide absolute path for this ?

      – Alex
      Jan 7 at 9:56






    • 1





      I think, It will be better to put the absolute path for your script. You can also check cron or system log if the script seems not working

      – victoroloan
      Jan 7 at 10:18












    • Can you also document what file you are referring to with your code block, people who are not familiar with the syntax of Incrond (like me) may think are referring to a command that you have to execute on the command line

      – Ferrybig
      Jan 7 at 15:08















    10














    You might need incrond (inotify cron daemon) which will monitors changes on files and then execute scripts.



    Incrond can monitor add new file, modify, delete and many more. This is an article shows what event incrond can monitor with some example.



    Example for your case, you might create the file /etc/incron.d/data_upload with the contents



    /tmp/data_upload IN_CREATE,IN_MODIFY /path/to/test.py 





    share|improve this answer




















    • 2





      Whilst this may theoretically answer the question, it would be preferable to include the essential parts of the answer here, and provide the link for reference.

      – Gerald Schneider
      Jan 7 at 9:10











    • Thanks for reminding me, I have added the context for the link.

      – victoroloan
      Jan 7 at 9:19












    • Thanks for the answer, just to verify the steps after installing incrontab shoudl execute incrontab -e as root then include this line /tmp/data_upload IN_CREATE,IN_MODIFY test.py ? so that to check once I upload a new file it should execute the test.py file ? where should I place the test.py file ? should i need to provide absolute path for this ?

      – Alex
      Jan 7 at 9:56






    • 1





      I think, It will be better to put the absolute path for your script. You can also check cron or system log if the script seems not working

      – victoroloan
      Jan 7 at 10:18












    • Can you also document what file you are referring to with your code block, people who are not familiar with the syntax of Incrond (like me) may think are referring to a command that you have to execute on the command line

      – Ferrybig
      Jan 7 at 15:08













    10












    10








    10







    You might need incrond (inotify cron daemon) which will monitors changes on files and then execute scripts.



    Incrond can monitor add new file, modify, delete and many more. This is an article shows what event incrond can monitor with some example.



    Example for your case, you might create the file /etc/incron.d/data_upload with the contents



    /tmp/data_upload IN_CREATE,IN_MODIFY /path/to/test.py 





    share|improve this answer















    You might need incrond (inotify cron daemon) which will monitors changes on files and then execute scripts.



    Incrond can monitor add new file, modify, delete and many more. This is an article shows what event incrond can monitor with some example.



    Example for your case, you might create the file /etc/incron.d/data_upload with the contents



    /tmp/data_upload IN_CREATE,IN_MODIFY /path/to/test.py 






    share|improve this answer














    share|improve this answer



    share|improve this answer








    edited Jan 8 at 8:43









    Jenny D

    23.5k116094




    23.5k116094










    answered Jan 7 at 9:09









    victoroloanvictoroloan

    1664




    1664







    • 2





      Whilst this may theoretically answer the question, it would be preferable to include the essential parts of the answer here, and provide the link for reference.

      – Gerald Schneider
      Jan 7 at 9:10











    • Thanks for reminding me, I have added the context for the link.

      – victoroloan
      Jan 7 at 9:19












    • Thanks for the answer, just to verify the steps after installing incrontab shoudl execute incrontab -e as root then include this line /tmp/data_upload IN_CREATE,IN_MODIFY test.py ? so that to check once I upload a new file it should execute the test.py file ? where should I place the test.py file ? should i need to provide absolute path for this ?

      – Alex
      Jan 7 at 9:56






    • 1





      I think, It will be better to put the absolute path for your script. You can also check cron or system log if the script seems not working

      – victoroloan
      Jan 7 at 10:18












    • Can you also document what file you are referring to with your code block, people who are not familiar with the syntax of Incrond (like me) may think are referring to a command that you have to execute on the command line

      – Ferrybig
      Jan 7 at 15:08












    • 2





      Whilst this may theoretically answer the question, it would be preferable to include the essential parts of the answer here, and provide the link for reference.

      – Gerald Schneider
      Jan 7 at 9:10











    • Thanks for reminding me, I have added the context for the link.

      – victoroloan
      Jan 7 at 9:19












    • Thanks for the answer, just to verify the steps after installing incrontab shoudl execute incrontab -e as root then include this line /tmp/data_upload IN_CREATE,IN_MODIFY test.py ? so that to check once I upload a new file it should execute the test.py file ? where should I place the test.py file ? should i need to provide absolute path for this ?

      – Alex
      Jan 7 at 9:56






    • 1





      I think, It will be better to put the absolute path for your script. You can also check cron or system log if the script seems not working

      – victoroloan
      Jan 7 at 10:18












    • Can you also document what file you are referring to with your code block, people who are not familiar with the syntax of Incrond (like me) may think are referring to a command that you have to execute on the command line

      – Ferrybig
      Jan 7 at 15:08







    2




    2





    Whilst this may theoretically answer the question, it would be preferable to include the essential parts of the answer here, and provide the link for reference.

    – Gerald Schneider
    Jan 7 at 9:10





    Whilst this may theoretically answer the question, it would be preferable to include the essential parts of the answer here, and provide the link for reference.

    – Gerald Schneider
    Jan 7 at 9:10













    Thanks for reminding me, I have added the context for the link.

    – victoroloan
    Jan 7 at 9:19






    Thanks for reminding me, I have added the context for the link.

    – victoroloan
    Jan 7 at 9:19














    Thanks for the answer, just to verify the steps after installing incrontab shoudl execute incrontab -e as root then include this line /tmp/data_upload IN_CREATE,IN_MODIFY test.py ? so that to check once I upload a new file it should execute the test.py file ? where should I place the test.py file ? should i need to provide absolute path for this ?

    – Alex
    Jan 7 at 9:56





    Thanks for the answer, just to verify the steps after installing incrontab shoudl execute incrontab -e as root then include this line /tmp/data_upload IN_CREATE,IN_MODIFY test.py ? so that to check once I upload a new file it should execute the test.py file ? where should I place the test.py file ? should i need to provide absolute path for this ?

    – Alex
    Jan 7 at 9:56




    1




    1





    I think, It will be better to put the absolute path for your script. You can also check cron or system log if the script seems not working

    – victoroloan
    Jan 7 at 10:18






    I think, It will be better to put the absolute path for your script. You can also check cron or system log if the script seems not working

    – victoroloan
    Jan 7 at 10:18














    Can you also document what file you are referring to with your code block, people who are not familiar with the syntax of Incrond (like me) may think are referring to a command that you have to execute on the command line

    – Ferrybig
    Jan 7 at 15:08





    Can you also document what file you are referring to with your code block, people who are not familiar with the syntax of Incrond (like me) may think are referring to a command that you have to execute on the command line

    – Ferrybig
    Jan 7 at 15:08













    1














    You could use entr to automatically run the script everytime a file changes by running ls /tmp/data_upload | entr -p script.py once at startup.



    Project website: http://eradman.com/entrproject/



    Online man page: https://www.systutorials.com/docs/linux/man/1-entr/






    share|improve this answer



























      1














      You could use entr to automatically run the script everytime a file changes by running ls /tmp/data_upload | entr -p script.py once at startup.



      Project website: http://eradman.com/entrproject/



      Online man page: https://www.systutorials.com/docs/linux/man/1-entr/






      share|improve this answer

























        1












        1








        1







        You could use entr to automatically run the script everytime a file changes by running ls /tmp/data_upload | entr -p script.py once at startup.



        Project website: http://eradman.com/entrproject/



        Online man page: https://www.systutorials.com/docs/linux/man/1-entr/






        share|improve this answer













        You could use entr to automatically run the script everytime a file changes by running ls /tmp/data_upload | entr -p script.py once at startup.



        Project website: http://eradman.com/entrproject/



        Online man page: https://www.systutorials.com/docs/linux/man/1-entr/







        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered Jan 7 at 13:48









        jln-hojln-ho

        111




        111





















            0














            The watchexec (https://crates.io/crates/watchexec) command line utility sounds like exactly what you need, although I believe to install it you'd need to have the Rust build tools installed on your machine, so that may be a dealbreaker






            share|improve this answer























            • I love using software written in rust because you know it wasn't abandoned in 2004 or something. It almost has to be new.

              – Nathaniel Pisarski
              Jan 8 at 2:25















            0














            The watchexec (https://crates.io/crates/watchexec) command line utility sounds like exactly what you need, although I believe to install it you'd need to have the Rust build tools installed on your machine, so that may be a dealbreaker






            share|improve this answer























            • I love using software written in rust because you know it wasn't abandoned in 2004 or something. It almost has to be new.

              – Nathaniel Pisarski
              Jan 8 at 2:25













            0












            0








            0







            The watchexec (https://crates.io/crates/watchexec) command line utility sounds like exactly what you need, although I believe to install it you'd need to have the Rust build tools installed on your machine, so that may be a dealbreaker






            share|improve this answer













            The watchexec (https://crates.io/crates/watchexec) command line utility sounds like exactly what you need, although I believe to install it you'd need to have the Rust build tools installed on your machine, so that may be a dealbreaker







            share|improve this answer












            share|improve this answer



            share|improve this answer










            answered Jan 7 at 15:31









            Ben SandeenBen Sandeen

            1011




            1011












            • I love using software written in rust because you know it wasn't abandoned in 2004 or something. It almost has to be new.

              – Nathaniel Pisarski
              Jan 8 at 2:25

















            • I love using software written in rust because you know it wasn't abandoned in 2004 or something. It almost has to be new.

              – Nathaniel Pisarski
              Jan 8 at 2:25
















            I love using software written in rust because you know it wasn't abandoned in 2004 or something. It almost has to be new.

            – Nathaniel Pisarski
            Jan 8 at 2:25





            I love using software written in rust because you know it wasn't abandoned in 2004 or something. It almost has to be new.

            – Nathaniel Pisarski
            Jan 8 at 2:25











            0














            My general approach would be to fiddle with the classical Unix find utility. For example, the command



            find /tmp/upload_data/*.csv -mtime -1 -exec /home/myname/test.py


            will find any .csv files in /tmp/upload_data that have been modified less than one day ago, and run your test.py if it finds any. Of course, if your test.py file is in some other directory, you want to update your path to it accordingly.



            If you run your cron job more often than once a day, you can use the mmin option to find to specify the maximal time since modification in minutes. For example,



            find /tmp/upload_data/*.csv -mmin -60 -exec /home/myname/test.py


            will search for .csv files that were modified less than 60 minutes ago -- useful if cron runs the job hourly.



            Two fair warnings are in order: First, this won't catch .csv files that you entirely deleted. You may want to check for these separately. Second, I did not have time to test any of this. Expect typos in my code that you'll have to debug by yourself.






            share|improve this answer




















            • 1





              What is the -cmd syntax? IIRC find takes -exec cmd ;...

              – D. Ben Knoble
              Jan 8 at 4:28











            • I have tried this one before posting this question ,this is not working properly on 2nd 3rd consecutive run of cron jobs

              – Alex
              Jan 8 at 7:31











            • @D. Ben Knoble: You're right. I mixed up find-internal commands with shell commands. Fixed. Thanks for the correction!

              – Thomas Blankenhorn
              Jan 8 at 8:37
















            0














            My general approach would be to fiddle with the classical Unix find utility. For example, the command



            find /tmp/upload_data/*.csv -mtime -1 -exec /home/myname/test.py


            will find any .csv files in /tmp/upload_data that have been modified less than one day ago, and run your test.py if it finds any. Of course, if your test.py file is in some other directory, you want to update your path to it accordingly.



            If you run your cron job more often than once a day, you can use the mmin option to find to specify the maximal time since modification in minutes. For example,



            find /tmp/upload_data/*.csv -mmin -60 -exec /home/myname/test.py


            will search for .csv files that were modified less than 60 minutes ago -- useful if cron runs the job hourly.



            Two fair warnings are in order: First, this won't catch .csv files that you entirely deleted. You may want to check for these separately. Second, I did not have time to test any of this. Expect typos in my code that you'll have to debug by yourself.






            share|improve this answer




















            • 1





              What is the -cmd syntax? IIRC find takes -exec cmd ;...

              – D. Ben Knoble
              Jan 8 at 4:28











            • I have tried this one before posting this question ,this is not working properly on 2nd 3rd consecutive run of cron jobs

              – Alex
              Jan 8 at 7:31











            • @D. Ben Knoble: You're right. I mixed up find-internal commands with shell commands. Fixed. Thanks for the correction!

              – Thomas Blankenhorn
              Jan 8 at 8:37














            0












            0








            0







            My general approach would be to fiddle with the classical Unix find utility. For example, the command



            find /tmp/upload_data/*.csv -mtime -1 -exec /home/myname/test.py


            will find any .csv files in /tmp/upload_data that have been modified less than one day ago, and run your test.py if it finds any. Of course, if your test.py file is in some other directory, you want to update your path to it accordingly.



            If you run your cron job more often than once a day, you can use the mmin option to find to specify the maximal time since modification in minutes. For example,



            find /tmp/upload_data/*.csv -mmin -60 -exec /home/myname/test.py


            will search for .csv files that were modified less than 60 minutes ago -- useful if cron runs the job hourly.



            Two fair warnings are in order: First, this won't catch .csv files that you entirely deleted. You may want to check for these separately. Second, I did not have time to test any of this. Expect typos in my code that you'll have to debug by yourself.






            share|improve this answer















            My general approach would be to fiddle with the classical Unix find utility. For example, the command



            find /tmp/upload_data/*.csv -mtime -1 -exec /home/myname/test.py


            will find any .csv files in /tmp/upload_data that have been modified less than one day ago, and run your test.py if it finds any. Of course, if your test.py file is in some other directory, you want to update your path to it accordingly.



            If you run your cron job more often than once a day, you can use the mmin option to find to specify the maximal time since modification in minutes. For example,



            find /tmp/upload_data/*.csv -mmin -60 -exec /home/myname/test.py


            will search for .csv files that were modified less than 60 minutes ago -- useful if cron runs the job hourly.



            Two fair warnings are in order: First, this won't catch .csv files that you entirely deleted. You may want to check for these separately. Second, I did not have time to test any of this. Expect typos in my code that you'll have to debug by yourself.







            share|improve this answer














            share|improve this answer



            share|improve this answer








            edited Jan 8 at 8:48

























            answered Jan 8 at 1:12









            Thomas BlankenhornThomas Blankenhorn

            1012




            1012







            • 1





              What is the -cmd syntax? IIRC find takes -exec cmd ;...

              – D. Ben Knoble
              Jan 8 at 4:28











            • I have tried this one before posting this question ,this is not working properly on 2nd 3rd consecutive run of cron jobs

              – Alex
              Jan 8 at 7:31











            • @D. Ben Knoble: You're right. I mixed up find-internal commands with shell commands. Fixed. Thanks for the correction!

              – Thomas Blankenhorn
              Jan 8 at 8:37













            • 1





              What is the -cmd syntax? IIRC find takes -exec cmd ;...

              – D. Ben Knoble
              Jan 8 at 4:28











            • I have tried this one before posting this question ,this is not working properly on 2nd 3rd consecutive run of cron jobs

              – Alex
              Jan 8 at 7:31











            • @D. Ben Knoble: You're right. I mixed up find-internal commands with shell commands. Fixed. Thanks for the correction!

              – Thomas Blankenhorn
              Jan 8 at 8:37








            1




            1





            What is the -cmd syntax? IIRC find takes -exec cmd ;...

            – D. Ben Knoble
            Jan 8 at 4:28





            What is the -cmd syntax? IIRC find takes -exec cmd ;...

            – D. Ben Knoble
            Jan 8 at 4:28













            I have tried this one before posting this question ,this is not working properly on 2nd 3rd consecutive run of cron jobs

            – Alex
            Jan 8 at 7:31





            I have tried this one before posting this question ,this is not working properly on 2nd 3rd consecutive run of cron jobs

            – Alex
            Jan 8 at 7:31













            @D. Ben Knoble: You're right. I mixed up find-internal commands with shell commands. Fixed. Thanks for the correction!

            – Thomas Blankenhorn
            Jan 8 at 8:37






            @D. Ben Knoble: You're right. I mixed up find-internal commands with shell commands. Fixed. Thanks for the correction!

            – Thomas Blankenhorn
            Jan 8 at 8:37


















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