How is Paramiko segregating output and error message?

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If I execute jdksjdkd in terminal from one machine to another machine using paramiko I am getting stderr.readlines() as Command not found.




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  • That "command not found" is usually printed by the shell to its stderr. That's probably how.
    – muru
    Jun 27 at 6:40














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0
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If I execute jdksjdkd in terminal from one machine to another machine using paramiko I am getting stderr.readlines() as Command not found.




linux




share|improve this question





















  • That "command not found" is usually printed by the shell to its stderr. That's probably how.
    – muru
    Jun 27 at 6:40












up vote
0
down vote

favorite









up vote
0
down vote

favorite











If I execute jdksjdkd in terminal from one machine to another machine using paramiko I am getting stderr.readlines() as Command not found.




linux




share|improve this question













If I execute jdksjdkd in terminal from one machine to another machine using paramiko I am getting stderr.readlines() as Command not found.





linux





share|improve this question












share|improve this question




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edited Jun 27 at 11:13









Anthony Geoghegan

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7,14233651









asked Jun 27 at 5:55









Abdulvakaf K

294




294











  • That "command not found" is usually printed by the shell to its stderr. That's probably how.
    – muru
    Jun 27 at 6:40
















  • That "command not found" is usually printed by the shell to its stderr. That's probably how.
    – muru
    Jun 27 at 6:40















That "command not found" is usually printed by the shell to its stderr. That's probably how.
– muru
Jun 27 at 6:40




That "command not found" is usually printed by the shell to its stderr. That's probably how.
– muru
Jun 27 at 6:40










1 Answer
1






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oldest

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up vote
2
down vote













The PATH environment variable indicates that where the commands resides.
So in your case , since "jdksjkdk" is not found in the $PATH , it throws error on STDERR file descriptor and hence you are getting stderr.readiness() as Command not found





Explanation: There are 3 standard file descriptors, every running program in linux opens the following file descriptors



  1. STDIN (0) => for standard input

  2. STDOUT(1) => for standard output

  3. STDERR (2) => for standard error



So when the command was not found, the error was written to STDERR (
file desciptor => 2 ) , if it was successful, then output would had
been written to STDOUT ( file descriptor => 1 ) . Since paramiko is
reading result from STDERR and not STDOUT , this is how it is
verifying it is error not output







share|improve this answer





















  • I believed the above statement. but in one of my case I am getting stdout(output) as stderr message. The data got swapped between this two. So that I raised this question.
    – Abdulvakaf K
    Jun 27 at 6:31










  • Maybe then it must be checking the return status of your process to check if it failed or not
    – Arushix
    Jun 27 at 6:35










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1 Answer
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active

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1 Answer
1






active

oldest

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active

oldest

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active

oldest

votes








up vote
2
down vote













The PATH environment variable indicates that where the commands resides.
So in your case , since "jdksjkdk" is not found in the $PATH , it throws error on STDERR file descriptor and hence you are getting stderr.readiness() as Command not found





Explanation: There are 3 standard file descriptors, every running program in linux opens the following file descriptors



  1. STDIN (0) => for standard input

  2. STDOUT(1) => for standard output

  3. STDERR (2) => for standard error



So when the command was not found, the error was written to STDERR (
file desciptor => 2 ) , if it was successful, then output would had
been written to STDOUT ( file descriptor => 1 ) . Since paramiko is
reading result from STDERR and not STDOUT , this is how it is
verifying it is error not output







share|improve this answer





















  • I believed the above statement. but in one of my case I am getting stdout(output) as stderr message. The data got swapped between this two. So that I raised this question.
    – Abdulvakaf K
    Jun 27 at 6:31










  • Maybe then it must be checking the return status of your process to check if it failed or not
    – Arushix
    Jun 27 at 6:35














up vote
2
down vote













The PATH environment variable indicates that where the commands resides.
So in your case , since "jdksjkdk" is not found in the $PATH , it throws error on STDERR file descriptor and hence you are getting stderr.readiness() as Command not found





Explanation: There are 3 standard file descriptors, every running program in linux opens the following file descriptors



  1. STDIN (0) => for standard input

  2. STDOUT(1) => for standard output

  3. STDERR (2) => for standard error



So when the command was not found, the error was written to STDERR (
file desciptor => 2 ) , if it was successful, then output would had
been written to STDOUT ( file descriptor => 1 ) . Since paramiko is
reading result from STDERR and not STDOUT , this is how it is
verifying it is error not output







share|improve this answer





















  • I believed the above statement. but in one of my case I am getting stdout(output) as stderr message. The data got swapped between this two. So that I raised this question.
    – Abdulvakaf K
    Jun 27 at 6:31










  • Maybe then it must be checking the return status of your process to check if it failed or not
    – Arushix
    Jun 27 at 6:35












up vote
2
down vote










up vote
2
down vote









The PATH environment variable indicates that where the commands resides.
So in your case , since "jdksjkdk" is not found in the $PATH , it throws error on STDERR file descriptor and hence you are getting stderr.readiness() as Command not found





Explanation: There are 3 standard file descriptors, every running program in linux opens the following file descriptors



  1. STDIN (0) => for standard input

  2. STDOUT(1) => for standard output

  3. STDERR (2) => for standard error



So when the command was not found, the error was written to STDERR (
file desciptor => 2 ) , if it was successful, then output would had
been written to STDOUT ( file descriptor => 1 ) . Since paramiko is
reading result from STDERR and not STDOUT , this is how it is
verifying it is error not output







share|improve this answer













The PATH environment variable indicates that where the commands resides.
So in your case , since "jdksjkdk" is not found in the $PATH , it throws error on STDERR file descriptor and hence you are getting stderr.readiness() as Command not found





Explanation: There are 3 standard file descriptors, every running program in linux opens the following file descriptors



  1. STDIN (0) => for standard input

  2. STDOUT(1) => for standard output

  3. STDERR (2) => for standard error



So when the command was not found, the error was written to STDERR (
file desciptor => 2 ) , if it was successful, then output would had
been written to STDOUT ( file descriptor => 1 ) . Since paramiko is
reading result from STDERR and not STDOUT , this is how it is
verifying it is error not output








share|improve this answer













share|improve this answer



share|improve this answer











answered Jun 27 at 6:21









Arushix

9968




9968











  • I believed the above statement. but in one of my case I am getting stdout(output) as stderr message. The data got swapped between this two. So that I raised this question.
    – Abdulvakaf K
    Jun 27 at 6:31










  • Maybe then it must be checking the return status of your process to check if it failed or not
    – Arushix
    Jun 27 at 6:35
















  • I believed the above statement. but in one of my case I am getting stdout(output) as stderr message. The data got swapped between this two. So that I raised this question.
    – Abdulvakaf K
    Jun 27 at 6:31










  • Maybe then it must be checking the return status of your process to check if it failed or not
    – Arushix
    Jun 27 at 6:35















I believed the above statement. but in one of my case I am getting stdout(output) as stderr message. The data got swapped between this two. So that I raised this question.
– Abdulvakaf K
Jun 27 at 6:31




I believed the above statement. but in one of my case I am getting stdout(output) as stderr message. The data got swapped between this two. So that I raised this question.
– Abdulvakaf K
Jun 27 at 6:31












Maybe then it must be checking the return status of your process to check if it failed or not
– Arushix
Jun 27 at 6:35




Maybe then it must be checking the return status of your process to check if it failed or not
– Arushix
Jun 27 at 6:35












 

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