Shell if "-z"

If -z in bash

The -z flag causes test to check whether a string is empty. 
Returns true if the string is empty, false if it contains something.

Shell if "-z"

# Returns true if string empty.
# E.G: file.txt does not exist

EXISTS=$(cat file.txt 2> /dev/null)

if [ -z "${EXISTS}" ]; then
	echo "Does not exist"
else
    echo "Exist!"
fi

# Output: 
# Does not exist

Similar codes

89 votes281 views6 answers
Kill process on port
Shell/Bash
0 vote284 views2 answers
Remove xampp from ubuntu
Shell/Bash
0 vote295 views2 answers
Kube allow pod deployment on master node
Shell/Bash
1 vote281 views1 answer
Resolusi layar ubuntu
Shell/Bash
-1 vote303 views6 answers
Show ip in docker
Shell/Bash
-1 vote295 views1 answer
The requested nginx plugin does not appear to be installed certbot
Shell/Bash
1 vote290 views1 answer
Browserrouter react not working install
Shell/Bash
1 vote293 views2 answers
Awk split on comma
Shell/Bash
0 vote296 views1 answer
Docker-compose ps
Shell/Bash
0 vote280 views1 answer
Git how to archive a branch
Shell/Bash