running multiple bash commands with subprocess

Question

If I run echo a  echo b in bash the result will be that both commands are run  However if I use subprocess then the first command is run  printing out the whole of the rest of the line  The code below echos a  echo b instead of a b  how do I get it to run both commands   import subprocess  shlex def subprocess cmd command       process   subprocess Popen shlex split command   stdout subprocess PIPE      proc stdout   process communicate   0  strip        print proc stdout  subprocess cmd  echo a  echo b

User · Answer

gt  gt  gt  command    echo a  echo b   gt  gt  gt  shlex split command         echo    a  echo    b     so  the problem is shlex module do not handle

User · Answer

I just stumbled on a situation where I needed to run a bunch of lines of bash code  not separated with semicolons  from within python  In this scenario the proposed solutions do not help  One approach would be to save a file and then run it with Popen  but it wasn t possible in my situation   What I ended up doing is something like   commands       echo  a  echo  b  echo  c  echo  d       process   subprocess Popen   bin bash   stdin subprocess PIPE  stdout subprocess PIPE  out  err   process communicate commands  print out   So I first create the child bash process and after I tell it what to execute  This approach removes the limitations of passing the command directly to the Popen constructor

User · Answer

You have to use shell True in subprocess and no shlex split   def subprocess cmd command       process   subprocess Popen command stdout subprocess PIPE  shell True      proc stdout   process communicate   0  strip       print proc stdout  subprocess cmd  echo a  echo b     returns   a b

User · Answer

Join commands with   amp  amp     os system  echo a  gt  outputa txt  amp  amp  echo b  gt  outputb txt

User · Answer

If you re only running the commands in one shot then you can just use subprocess check output convenience function   def subprocess cmd command       output   subprocess check output command  shell True      print output

User · Answer

import subprocess cmd    quot vsish -e ls  vmkModules lsom disks     cut -d     -f 1    while read diskID    do echo  diskID  vsish -e cat  vmkModules lsom disks  diskID virstoStats   grep -iE  Delete pending  trims currently queued     echo                         done   quot    def subprocess cmd command       process   subprocess Popen command stdout subprocess PIPE  shell True      proc stdout   process communicate   0  strip       for line in proc stdout decode   split   n            print  line   subprocess cmd cmd

[python] running multiple bash commands with subprocess

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