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#!/bin/bash
declare cur_tty=$(ps -o tty= |head -n1)
declare cur_uid=($(ps -o ruser= n |head -n1))
declare cur_user=$(grep "[^:]\+:[^:]*:${cur_uid[0]}:" /etc/passwd \
| cut -d ':' -f 1)
declare -a ulist=( $(ps -a -o args,tty,ruser n \
| grep '^newgrp quaggavty' | cut -c 29-) )
for (( i = 0; i < ${#ulist[@]}; i += 2 )); do
utty=${ulist[i]}
if [ "$utty" == "$cur_tty" ]; then
continue
fi
user=$(grep "[^:]\+:[^:]*:${ulist[i+1]}:" /etc/passwd | cut -d ':' -f 1)
sudo write $user $utty <<EOF
Active configuration has been changed by user '$cur_user' on '$cur_tty'.
Please make sure you do not have conflicting changes. You can also discard
the current changes by issuing 'exit discard'.
EOF
done
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