redirect stderr to dev/null in bash env. - Shell Programming and Scripting

Sniper Pixie · #1 03-07-2006

Working in a bash environment, in the following example, how do I direct the error message that putting in an invalid flag (-j for example) would normally produce to dev/null?

while getopts "abcd" opt
do
case "$opt" in
i) a etc ;;
r) b etc ;;
f) c etc ;;
v) d etc ;;
\?) direct actual error message to dev/null

exit 1 ;;
esac
done

vino · #2 03-07-2006

Quote:

Originally Posted by Sniper Pixie

Working in a bash environment, in the following example, how do I direct the error message that putting in an invalid flag (-j for example) would normally produce to dev/null?

while getopts "abcd" opt
do
case "$opt" in
i) a etc ;;
r) b etc ;;
f) c etc ;;
v) d etc ;;
\?) direct actual error message to dev/null

exit 1 ;;
esac
done

Code:

while getopts "abcd" opt
do
    case "$opt" in
      i) a etc ;;
      r) b etc ;;
      f) c etc ;;
      v) d etc ;;
      *) exit 1 ;;
    esac
done

Just exit.

Sniper Pixie · #3 03-07-2006

That doesn't work. It still outputs that -j is an invalid option

matrixmadhan · #4 03-07-2006

if you are so particular about the error messages from bash...
then this would do..

Code:

bash <yourscript> 2>/dev/null

vino · #5 03-07-2006

Playing around...

Code:

while getopts "abcd" opt
do
    case "$opt" in
      i) a etc ;;
      r) b etc ;;
      f) c etc ;;
      v) d etc ;;
      \?) echo "$opt" 2>/dev/null ; exit 1 ;;
    esac
done

vino · #6 03-07-2006

Else see this link - . Handling Command Line Arguments

Sniper Pixie · #7 03-07-2006

I'm afraid neither of those two solutions work. Both still print the error message, with the added bonus of yours producing a question mark as well, Vino.

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