­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ #!/bin/bash if ! ls -l /dev/null|grep -q crw.rw.rw.;then echo "/dev/null permissions - NOT OK" exit 2 else echo "/dev/null permissions - OK" exit 0 fi