How to run shell script in silent mode

x057373 · #1 (**permalink**) 12-03-2005

Hi,

I have a AIX shell script that normally runs in an interactive mode. Now there is a need to it in silent mode and take all default answers.

How do I do that?

Thanks.

grahamb · #2 (**permalink**) 12-04-2005

Hi!

Try this idea;

If a script needs to test whether it is running in an interactive shell, it is simply a matter of finding whether the prompt variable, $PS1 is set. (If the user is being prompted for input, then the script needs to display a prompt.)

Code:

if [ -z $PS1 ] # what no prompt?
then
  # non-interactive;   ...
else
  # interactive;   ...
fi

There are other ideas there in this link: http://www.tldp.org/LDP/abs/html/intandnonint.html

One more is that if in background/foreground there is a tty-variable that is set or not set. You could also do something like put a special variable in "~./.profile" that shows that the user is online, eg: $PS1 above. (Just ideas: got no references or clearer ideas on these last ones!)

Hope that was helpful
GrahamB

bakunin · #3 (**permalink**) 12-04-2005

A Korn shell in interactive mode has the "-i" flag set, hence:

Code:

if [ $(print - "$-" | grep -c "i") -gt 0 ] ; then
     print - "shell is interactive"
else
     print - "shell is non-interactive"
fi

bakunin

zazzybob · #4 (**permalink**) 12-04-2005

My two cents....

Code:

case $- in
   *i*) echo "Yay" ;;
   *  ) echo "Nay" ;;
esac

Cheers
ZB

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