Redirect stdout / stderr output to log file with timestamp

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0
down vote

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I'm trying to redirect the stdout and stderr to a log file. The filename should be created dynamically with current timestamp.



I can create the filename with the following command:



$ date +%Y-%m-%d_%H-%M-%S.txt
2018-04-10_16-55-55.txt


So I want to do something like this:



mycommand &> (date +%Y-%m-%d_%H-%M-%S.txt)


But this doesn't work (-bash: syntax error near unexpected token('`)




io-redirection timestamps




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  • Similar (no dupe): unix.stackexchange.com/questions/436800/…
    – Kusalananda
    Apr 10 at 17:03














up vote
0
down vote

favorite












I'm trying to redirect the stdout and stderr to a log file. The filename should be created dynamically with current timestamp.



I can create the filename with the following command:



$ date +%Y-%m-%d_%H-%M-%S.txt
2018-04-10_16-55-55.txt


So I want to do something like this:



mycommand &> (date +%Y-%m-%d_%H-%M-%S.txt)


But this doesn't work (-bash: syntax error near unexpected token('`)




io-redirection timestamps




share|improve this question




















  • Similar (no dupe): unix.stackexchange.com/questions/436800/…
    – Kusalananda
    Apr 10 at 17:03












up vote
0
down vote

favorite









up vote
0
down vote

favorite











I'm trying to redirect the stdout and stderr to a log file. The filename should be created dynamically with current timestamp.



I can create the filename with the following command:



$ date +%Y-%m-%d_%H-%M-%S.txt
2018-04-10_16-55-55.txt


So I want to do something like this:



mycommand &> (date +%Y-%m-%d_%H-%M-%S.txt)


But this doesn't work (-bash: syntax error near unexpected token('`)




io-redirection timestamps




share|improve this question












I'm trying to redirect the stdout and stderr to a log file. The filename should be created dynamically with current timestamp.



I can create the filename with the following command:



$ date +%Y-%m-%d_%H-%M-%S.txt
2018-04-10_16-55-55.txt


So I want to do something like this:



mycommand &> (date +%Y-%m-%d_%H-%M-%S.txt)


But this doesn't work (-bash: syntax error near unexpected token('`)





io-redirection timestamps





share|improve this question











share|improve this question




share|improve this question










asked Apr 10 at 14:01









Caner

1033




1033











  • Similar (no dupe): unix.stackexchange.com/questions/436800/…
    – Kusalananda
    Apr 10 at 17:03
















  • Similar (no dupe): unix.stackexchange.com/questions/436800/…
    – Kusalananda
    Apr 10 at 17:03















Similar (no dupe): unix.stackexchange.com/questions/436800/…
– Kusalananda
Apr 10 at 17:03




Similar (no dupe): unix.stackexchange.com/questions/436800/…
– Kusalananda
Apr 10 at 17:03










2 Answers
2






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up vote
2
down vote



accepted










Yes, you will need to use a command substitution:



mycommand &> "$(date +%Y-%m-%d_%H-%M-%S.txt)"


Which is bash-speak for



mycommand >"$(date +%Y-%m-%d_%H-%M-%S.txt)" 2>&1


Which is the same as



mycommand >"$(date +%F_%H-%M-%S.txt)" 2>&1


(%F is the same as %Y-%m-%d)



A command substitution, $(...), will be replaced by the output of the command inside.



What you used was a sub-shell, (...). A sub-shell can't accept redirections like that.






share|improve this answer





























    up vote
    1
    down vote













    Try this:



    today=`date +%Y-%m-%d_%H-%M-%S`; mycommand > $today.txt 2>&1





    share|improve this answer




















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      2 Answers
      2






      active

      oldest

      votes








      2 Answers
      2






      active

      oldest

      votes









      active

      oldest

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      active

      oldest

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      up vote
      2
      down vote



      accepted










      Yes, you will need to use a command substitution:



      mycommand &> "$(date +%Y-%m-%d_%H-%M-%S.txt)"


      Which is bash-speak for



      mycommand >"$(date +%Y-%m-%d_%H-%M-%S.txt)" 2>&1


      Which is the same as



      mycommand >"$(date +%F_%H-%M-%S.txt)" 2>&1


      (%F is the same as %Y-%m-%d)



      A command substitution, $(...), will be replaced by the output of the command inside.



      What you used was a sub-shell, (...). A sub-shell can't accept redirections like that.






      share|improve this answer


























        up vote
        2
        down vote



        accepted










        Yes, you will need to use a command substitution:



        mycommand &> "$(date +%Y-%m-%d_%H-%M-%S.txt)"


        Which is bash-speak for



        mycommand >"$(date +%Y-%m-%d_%H-%M-%S.txt)" 2>&1


        Which is the same as



        mycommand >"$(date +%F_%H-%M-%S.txt)" 2>&1


        (%F is the same as %Y-%m-%d)



        A command substitution, $(...), will be replaced by the output of the command inside.



        What you used was a sub-shell, (...). A sub-shell can't accept redirections like that.






        share|improve this answer
























          up vote
          2
          down vote



          accepted







          up vote
          2
          down vote



          accepted






          Yes, you will need to use a command substitution:



          mycommand &> "$(date +%Y-%m-%d_%H-%M-%S.txt)"


          Which is bash-speak for



          mycommand >"$(date +%Y-%m-%d_%H-%M-%S.txt)" 2>&1


          Which is the same as



          mycommand >"$(date +%F_%H-%M-%S.txt)" 2>&1


          (%F is the same as %Y-%m-%d)



          A command substitution, $(...), will be replaced by the output of the command inside.



          What you used was a sub-shell, (...). A sub-shell can't accept redirections like that.






          share|improve this answer














          Yes, you will need to use a command substitution:



          mycommand &> "$(date +%Y-%m-%d_%H-%M-%S.txt)"


          Which is bash-speak for



          mycommand >"$(date +%Y-%m-%d_%H-%M-%S.txt)" 2>&1


          Which is the same as



          mycommand >"$(date +%F_%H-%M-%S.txt)" 2>&1


          (%F is the same as %Y-%m-%d)



          A command substitution, $(...), will be replaced by the output of the command inside.



          What you used was a sub-shell, (...). A sub-shell can't accept redirections like that.







          share|improve this answer














          share|improve this answer



          share|improve this answer








          edited Apr 10 at 14:36

























          answered Apr 10 at 14:20









          Kusalananda

          102k13200317




          102k13200317






















              up vote
              1
              down vote













              Try this:



              today=`date +%Y-%m-%d_%H-%M-%S`; mycommand > $today.txt 2>&1





              share|improve this answer
























                up vote
                1
                down vote













                Try this:



                today=`date +%Y-%m-%d_%H-%M-%S`; mycommand > $today.txt 2>&1





                share|improve this answer






















                  up vote
                  1
                  down vote










                  up vote
                  1
                  down vote









                  Try this:



                  today=`date +%Y-%m-%d_%H-%M-%S`; mycommand > $today.txt 2>&1





                  share|improve this answer












                  Try this:



                  today=`date +%Y-%m-%d_%H-%M-%S`; mycommand > $today.txt 2>&1






                  share|improve this answer












                  share|improve this answer



                  share|improve this answer










                  answered Apr 10 at 14:20









                  L.Ray

                  1967




                  1967






















                       

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