{{tag>[linux lock script]}}
=====flock - locking from shell scripts=====
Example
<code># stop on errors
set -e
 
scriptname=$(basename $0)
pidfile="/var/run/${scriptname}"
 
# lock it
exec 200>$pidfile
flock -n 200 || exit 1
pid=$$
echo $pid 1>&200
 
## Your code:</code>