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 vote158 views1 answer
Install MUI React UI framework
Shell/Bash
0 vote138 views1 answer
Selinux apache 403
Shell/Bash
3 votes144 views1 answer
Linux check cronjob log
Shell/Bash
0 vote123 views1 answer
Check ssl certificate linux
Shell/Bash
2 votes134 views1 answer
How to fix /opt/lampp/bin/mysql.server: 264: kill: no such process
Shell/Bash
0 vote141 views1 answer
P4merge tool config
Shell/Bash
0 vote151 views1 answer
Tns-platform-declarations/android/android.d.ts' not found
Shell/Bash
0 vote155 views1 answer
Sexy bash
Shell/Bash
0 vote143 views1 answer
Git credentials store with timeout
Shell/Bash
0 vote138 views1 answer
Digit qweb odoo
Shell/Bash