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+{{tag>[linux lock script]}}
+~~TOC~~
+=====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>