scripts with locking

read-lock.sh

#!/bin/bash
set -xeuo pipefail

(
flock -s -w 6 200
cat /tmp/x
echo read
sleep 5
) 200>/tmp/pidlock

write-lock.sh

#!/bin/bash
set -xeuo pipefail

(
flock -w 6 200
echo "abc" > /tmp/x
echo write
sleep 5
) 200>/tmp/pidlock