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

0 vote111 views1 answer
Ubuntu youtube download playlists
Shell/Bash
0 vote104 views1 answer
Vagrant init ubuntu/trusty64
Shell/Bash
3 votes107 views3 answers
Git branch change remote
Shell/Bash
1 vote109 views1 answer
Ge in shell script
Shell/Bash
0 vote124 views1 answer
Update nodejs centos
Shell/Bash
1 vote65 views1 answer
Linux, get host user
Shell/Bash
0 vote104 views1 answer
Pacman export package list
Shell/Bash
9 votes101 views4 answers
Install pyenv
Shell/Bash
0 vote104 views1 answer
Git ls files sort by date
Shell/Bash
0 vote106 views1 answer
Export github branch from one repository to another
Shell/Bash