The output message "Permission denied" comes from STDERR not from STDIN.
You should redirect stderr to stdin on your command, to make it work.
ifconfig wlan0 down 2>&1 | grep -i denied
On Sun, Oct 25, 2009 at 2:42 PM, Eugeneapolinary Ju <
eugeneapolinar...@yahoo.com> wrote:
> I just wrote a li
I just wrote a little script, that will echo a message to the user, if it
doesn't have enough permission:
$ if ! [ "$(env LC_MESSAGES=C ifconfig wlan0 down | grep -i denied)" == "" ];
then echo "no permission"; fi
SIOCSIFFLAGS: Permission denied
$ sudo su
[sudo] password for USER:
# if !
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