Sample Script

[Ajin_1]

Hi

What does the below said Scrips Explanation.

ps -ex | grep -v grep | grep "self test" > /dev/null 2>&1

if [ "$?" -eq 0 ]; then
    echo "0"
else
    echo "1"
fi

[Duncan Edmonstone · Accepted solution]

Are you asking what this script snippet does?

If so, it will print "0" to stdout if it finds a process in the system process table that contains the string "self test". If it doesn't find a process that contains the string "self test" it will print a "1" to stdout

[Dennis Handly]

You can optimize this so you only have one grep:

ps -ex | grep -q "[s]elf test"

Also you might want to change the echoes to something more meaningful:

echo "Found process: 0"