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 vote154 views1 answer
Shell foreach line
Shell/Bash
0 vote178 views1 answer
How to install emmet atom
Shell/Bash
8 votes162 views2 answers
Anaconda navigator linux command
Shell/Bash
1 vote153 views1 answer
Clean Up Migrations and Speed up Tests
Shell/Bash
22 votes169 views2 answers
How to check the list of all applications in ubuntu
Shell/Bash
1 vote191 views1 answer
How to remove a plugin from ionic project
Shell/Bash
0 vote210 views2 answers
How to clone git all repository git ubuntu
Shell/Bash
0 vote154 views1 answer
Powershell search array
Shell/Bash
14 votes193 views4 answers
How to add node_modules to gitignore
Shell/Bash
1 vote195 views1 answer
Bash split and get last
Shell/Bash