How to use only a sub shell to execute many commands in python

Reedick, Andrew jr9445 at ATT.COM
Fri Jan 18 18:39:55 CET 2008


> -----Original Message-----
> From: python-list-bounces+jr9445=att.com at python.org [mailto:python-
> list-bounces+jr9445=att.com at python.org] On Behalf Of raocheng
> Sent: Friday, January 18, 2008 6:31 AM
> To: python-list at python.org
> Subject: How to use only a sub shell to execute many commands in
python
> 
> Please see the following code.
> Suppose I have many shell commands to be executed. And I don't want to
> fork a sub shell for each command(eg: status,output =
> commands.getstatusoutput(cmd)) because it is too expensive. I want to
> use only one sub shell to execute all these commands and want to get
> each command's output. How can I accomplish this task ? Thanks in
> advance.
> 
> ===========================================
> #!/usr/bin/env python
> import os
> fi, fo = os.popen2(
> '''
> while read line
> do
>   eval $line
> done
> ''',   't')
> 
> #Suppose I have many commands to execute, but I don't want to fork a
> sub shell for each command
> cmds = ['date','uptime','pwd','ls -rltF','who']
> 
> for cmd in cmds:
>     #pseudocode
>     fi.executeCmd(cmd)
>     output = fo.readResult()
> 
>     print output


Have each command write to a unique temp file.  
	Create temp files in python
	cmd = 'date > /tmp/date_temp 2>&1 ; uptime > /tmp/uptime_temp
2>&1; ...'
	execute cmd
	for file in tempfiles:
		...
	
You can also get the return value of each command
	cmd = 'date > /tmp/date_temp 2>&1; echo $? >> /tmp/date_temp;
uptime > /tmp/uptime_temp 2>&1; echo $? >> ...'




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