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 vote131 views1 answer
What is appmenu-gtk-module
Shell/Bash
8 votes151 views1 answer
Linux find from file content
Shell/Bash
0 vote142 views1 answer
Metasploit msf commands kali linux
Shell/Bash
1 vote129 views1 answer
Linux dir one line
Shell/Bash
1 vote133 views5 answers
Git remove tag
Shell/Bash
3 votes128 views1 answer
Publish pypi
Shell/Bash
6 votes140 views4 answers
Activate venv linux
Shell/Bash
0 vote134 views1 answer
Installing flow globally
Shell/Bash
8 votes91 views1 answer
Unistall nginx
Shell/Bash
0 vote143 views1 answer
Running InfluxDB in a container over a network
Shell/Bash