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Shell Programming and Scripting

need help in IF condition!!

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Top Forums Shell Programming and Scripting need help in IF condition!!
# 15  
Old 02-02-2009
Code:
test -s file66.txt || { mailx -s "file66.txt size zero" you@example.net </dev/null; exit 99; }
echo "Shell Script Worked"

The braces are used when there are multiple commands you want to execute after || but you could also write this as an "if then else" if that's more convenient. Then it's easier to add commands, too.

Code:
if test -s file66.txt
then
    mailx -s "file66.txt size zero" you@example.net </dev/null
    exit 99
fi
echo "Shell script worked"

The braces and the semicolons are not necessary here, because everything up to "fi" (or "else") is executed when the condition matches. The || { stuff; } syntax is just basically a shorthand for when you want to cram stuff into a one-liner.
# 16  
Old 02-07-2009
Just need a quick info on this . if we need to break exit 1 or exit 0 will work instead of exit 99

Thanks!!
# 17  
Old 02-08-2009
This should also work

Code:
test -s file66.txt && echo "Shell Script Worked" || exit 99

or


Code:
[ -s file66.txt ] && echo "Shell Script Worked" || exit 99

Last edited by ddreggors; 02-08-2009 at 01:00 AM..
# 18  
Old 02-09-2009
Thanks .. But just need to confirm whether exit 0 or exit 1 will work ..

I dont want to use exit 99 ..

Please let me know exit 0 or exit 1 will work instead of exit 99.

Thanks!!
# 19  
Old 02-09-2009
"exit" will always exit, the number is the result code returned by the script from which you exited. An exit code of zero conventionally means "no error", any other number is treated as an error. This doesn't really matter if you are simply ignoring the exit code; but returning a meaningful exit code is useful so that you can use the script from another script.

Code:
if yourscripthere; then
  # your script did "exit" or "exit 0"
else
  # your script did "exit 1" or some other nonzero number
  # the precise number will be in $?
fi

The maximum number is 255 (as per POSIX, etc).
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