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

22 votes279 views6 answers
Use nvm to install latest node
Shell/Bash
0 vote322 views2 answers
Removing letstencrypt from domain
Shell/Bash
1 vote285 views1 answer
Bash set -x
Shell/Bash
0 vote302 views1 answer
Reattach to screen
Shell/Bash
0 vote271 views1 answer
How to install turtle module la bibliotheque turtle
Shell/Bash
-2 votes282 views1 answer
Linux wget command
Shell/Bash
0 vote275 views1 answer
Install caprine linux
Shell/Bash
2 votes292 views2 answers
Find total commit in git by specific user
Shell/Bash
0 vote291 views1 answer
Package manager dotnet 5.0 frameworks
Shell/Bash
0 vote346 views1 answer
Portainer instal
Shell/Bash