Linux shell scripting

[Ragni Singh]

Hello, all, I have this script with a whole bunch of "if" statements.

How is it possible to make it into a nested "if' statement or if there is such a thing.

Does anyone else have any idea how to make this a better script?

[Stuart Browne]

Well, nested is exactally as you think it should be:

if [ condition ]
then
if [ nextcondition ]
then
if [ anothercondition ]
then
code
fi
fi
fi

Or in-line:

if [ condition -a nextcondition -a anothercondition ]
then
code
fi

Or perhaps you'd prefer a case:

case value in
value1) code ;;
value2) code ;;
*) defaultcode ;;
esac

[Gopi Sekar]

case is ideal for these kind of situation.

if that is not possible you can use if-elif-fi

eg:
if
then

elif
then

else

fi


Regards,
Gopi

[Steve_160]

Maybe a "case" statement might work better for you. It's hard to say without seeing the script.

[Steve_160]

Oops. Sorry, Gopi. :-/ I didn't mean to repeat what you said. When the question first came up on the screen there were no replies shown.

[Gopi Sekar]

steve,
for that matter i indeed repeated stuart's suggestion :)

if you are not able to see the replies, then raise it as an issue to moderators

[Ross Minkov]

See the Advanced Bash-Scripting Guide at http://www.tldp.org/LDP/abs/html/testconstructs.html for more examples.

-Ross