How do I pipe a subprocess call to a text file

Question

subprocess call    home myuser run sh     tmp ad xml      tmp video xml      RIght now I have a script that I run  When I run it and it hits this line  it starts printing stuff because run sh has prints in it   How do I pipe this to a text file also   And also print  if possible

User · Answer

The options for popen can be used in call  args   bufsize 0   executable None   stdin None   stdout None   stderr None   preexec fn None   close fds False   shell False   cwd None   env None   universal newlines False   startupinfo None   creationflags 0   So      subprocess call    home myuser run sh     tmp ad xml      tmp video xml    stdout myoutput    Then you can do what you want with myoutput  which would need to be a file btw    Also  you can do something closer to a piped output like this   dmesg   grep hda   would be       p1   Popen   dmesg    stdout PIPE  p2   Popen   grep    hda    stdin p1 stdout  stdout PIPE  output   p2 communicate   0    There s plenty of lovely  useful info on the python manual page

User · Answer

If you want to write the output to a file you can use the stdout-argument of subprocess call   It takes None  subprocess PIPE  a file object or a file descriptor  The first is the default  stdout is inherited from the parent  your script   The second allows you to pipe from one command process to another  The third and fourth are what you want  to have the output written to a file   You need to open a file with something like open and pass the object or file descriptor integer to call   f   open  blah txt    w   subprocess call    home myuser run sh     tmp ad xml      tmp video xml    stdout f    I m guessing any valid file-like object would work  like a socket  gasp      but I ve never tried   As marcog mentions in the comments you might want to redirect stderr as well  you can redirect this to the same location as stdout with stderr subprocess STDOUT  Any of the above mentioned values works as well  you can redirect to different places

User · Answer

You could also just call the script from the terminal  outputting everything to a file  if that helps  This way     path to the script py  gt  output txt  This will overwrite the file  You can use  gt  gt  to append to it  If you want errors to be logged in the file as well  use  amp  gt  gt  or  amp  gt

[python] How do I pipe a subprocess call to a text file?

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