/Shell/Bash/Bash check if variable is empty

Bash check if variable is empty

Bash if null or empty

if [ -z "$variable" ];
  then echo "$variable is null";
  else echo "$variable is not null";
fi

13

Bash if variable is not empty

VAR=`echo Hello world`
if [[ -n "$VAR" ]] ; then echo "Variable is set"  ; fi
if [[ -z "$VAR" ]] ; then echo "Variable is null" ; fi

5

Bash check if variable is empty

if [ -z "$var" ] #return true if $var is unset

2

Similar codes

2 votes137 views1 answer
Bash string variable multiline string
Shell/Bash
0 vote136 views1 answer
Linux make user like root
Shell/Bash
36 votes129 views3 answers
Linux check ip address command
Shell/Bash
1 vote90 views1 answer
Sed insert new line at end of file
Shell/Bash
111 votes134 views6 answers
Install bootstrap in react
Shell/Bash
0 vote148 views1 answer
Run ssh and immediately execute command
Shell/Bash
1 vote125 views1 answer
Database metasploit kali linux
Shell/Bash
20 votes124 views6 answers
Revert to commit git
Shell/Bash
0 vote133 views1 answer
Error: Unable to find a match: centos-release-openstack-queens
Shell/Bash
0 vote125 views1 answer
Check android studio path linux
Shell/Bash

Share