Running bash script from within python

Question

I have a problem with the following code   callBash py   import subprocess print  start  subprocess call  sleep sh   print  end    sleep sh   sleep 10   I want the  end  to be printed after 10s   I know that this is a dumb example  I could simply sleep within python  but this simple sleep sh file was just as a test

User · Answer

Make sure that sleep sh has execution permissions  and run it with shell True      usr bin python  import subprocess print  start  subprocess call    sleep sh   shell True  print  end

User · Answer

Actually  you just have to add the shell True argument   subprocess call  sleep sh   shell True    But beware -      Warning Invoking the system shell with shell True can be a security hazard if combined with untrusted input  See the warning under Frequently Used Arguments for details    source

User · Answer

Making sleep sh executable and adding shell True to the parameter list  as suggested in previous answers  works ok  Depending on the search path  you may also need to add    or some other appropriate path    Ie  change  sleep sh  to    sleep sh     The shell True parameter is not needed  under a Posix system like Linux  if the first line of the bash script is a path to a shell  for example     bin bash

User · Answer

If sleep sh has the shebang    bin sh and it has appropriate file permissions  -- run chmod u rx sleep sh to make sure and it is in  PATH then your code should work as is   import subprocess  rc   subprocess call  sleep sh     If the script is not in the PATH then specify the full path to it e g   if it is in the current working directory   from subprocess import call  rc   call    sleep sh     If the script has no shebang then you need to specify shell True   rc   call    sleep sh   shell True    If the script has no executable permissions and you can t change it e g   by running os chmod  sleep sh   0o755  then you could read the script as a text file and pass the string to subprocess module instead   with open  sleep sh    rb   as file      script   file read   rc   call script  shell True

User · Answer

If chmod not working then you also try  import os os system  sh script sh    you can also use bash instead of sh   test by me thanks

User · Answer

Adding an answer because I was directed here after asking how to run a bash script from python  You receive an error OSError   Errno 2  file not found if your script takes in parameters  Lets say for instance your script took in a sleep time parameter  subprocess call  sleep sh 10   will not work  you must pass it as an array  subprocess call   sleep sh   10

User · Answer

If someone looking for calling a script with arguments   import subprocess  val   subprocess check call    script sh   s     arg  shell True    Remember to convert the args to string before passing  using str arg    This can be used to pass as many arguments as desired   subprocess check call    script ksh  s  s  s     arg1  str arg2   arg3   shell True

[python] Running bash script from within python

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