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

1 vote150 views1 answer
Ubuntu install htop
Shell/Bash
1 vote158 views1 answer
How to remove git hooks
Shell/Bash
6 votes215 views3 answers
How to close port 3000 running
Shell/Bash
0 vote145 views1 answer
Run cmd elevated command line
Shell/Bash
21 votes147 views6 answers
Revert commit git
Shell/Bash
13 votes146 views1 answer
Git update comment
Shell/Bash
1 vote172 views1 answer
Linux repository list
Shell/Bash
32 votes171 views6 answers
List git config
Shell/Bash
0 vote160 views2 answers
Remove pyqt5 with conda
Shell/Bash
1 vote142 views2 answers
Turn off screen linux
Shell/Bash