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Test for interactive vs non-interactive shell

Posted on 2008-10-20
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Last Modified: 2013-12-26
I am trying to incorporate a test into my bash scripts which will select different code depending on whether or not it runs in an interactive or a non-interactive mode.

Given the following two programs:

File: qk.sh
---------------
#!/bin/bash

plen=${#PS1}
if [ -z "$PS1" ]; then
        echo -e "This shell is interactive:$plen :$PS1"
else
        echo -e "This shell is non-interactive:$plen :$PS1"
fi


File2: qk2.sh
-------------
#!/bin/bash
./qk.sh > ckit
cat ./ckit



When I run qk.sh during and interactive session, it prints

"This shell is interactive:0 : "

When I run qk2.sh, which I assume means I am running qk.sh non-interactively, I get the same output.

Any insights would be appreciated.

-G



if [ -z "$PS1" ]; then
        echo This shell is not interactive
else
        echo This shell is interactive
fi
0
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Question by:gmanpert
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3 Comments
 
LVL 84

Assisted Solution

by:ozo
ozo earned 2000 total points
ID: 22760692
if ps -p $PPID | grep -- '-[a-z]*$' ; then
  echo -e "This shell is interactive:$plen :$PS1"
else
          echo -e "This shell is non-interactive:$plen :$PS1"
fi
0
 
LVL 84

Accepted Solution

by:
ozo earned 2000 total points
ID: 22760762
if perl -e 'exit -t STDOUT' ; then
        echo -e "This shell is non-interactive:$plen :$PS1"
else
        echo -e "This shell is interactive:$plen :$PS1"
fi

0
 

Author Closing Comment

by:gmanpert
ID: 31507915
The first method did not work for me. The output was "This shell is non-interactive:0 : " when I ran it from the bash command line.  

The second one works wonders. - Thanks.
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