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Shell Programming and Scripting

How to tell which shell is running a script

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Top Forums Shell Programming and Scripting How to tell which shell is running a script
# 8  
Old 10-23-2009
Quote:
Originally Posted by Scrutinizer
Code:
ps -p$$ | xargs -n1 | tail -1

linux:
Code:
ps p$$ ocomm h

Both of these return the name of the script. If I have a script named test.sh:
Code:
#!/bin/sh
ps -p$$ | xargs -n1 | tail -1

or

Code:
#!/bin/sh
ps p$$ ocomm h

both return "test.sh". I'm on RHEL 5.3.

I'm hoping to find somethat that will tell me "sh" or "ksh" or whatever shell is actually interpreting the script.
# 9  
Old 10-23-2009
Quote:
Originally Posted by sbaker
I'm hoping to find somethat that will tell me "sh" or "ksh" or whatever shell is actually interpreting the script.

It's better to test whether the current shell has the features your script needs.
# 10  
Old 10-23-2009
a variation on a theme (tested on Solaris):
Code:
#!/bin/ksh

echo "myShell->[$(ps -o 'pid,comm' -p "${$}" | xargs -n1 | tail -1)]"
# OR
# echo "myShell->[$(ps -o comm -p "$$" | { read; read comm; echo "$comm"; })]"

Last edited by vgersh99; 10-23-2009 at 07:45 PM..
# 11  
Old 10-23-2009
Quote:
Originally Posted by vgersh99
a variation on a theme (tested on Solaris):
Code:
#!/bin/ksh
 
echo "myShell->[$(ps -o 'pid,comm' -p "${$}" | xargs -n1 | tail -1)]"

This works for me on AIX, but on Linux it always returns:

myShell->[test.sh]
# 12  
Old 10-23-2009
I don't have linux in front of me, but most likely it should be a combination of what you do on above with what 'Scrutinizer' suggested previously.
Maybe others could 'port' this to linux for you.
# 13  
Old 10-23-2009
This should work in RHEL 5.3:
Code:
#!/bin/sh
comm=$(ps -p $$ -o command h|cut -d' ' -f1)
shell=${comm##*/}
echo $shell
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