/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

0 vote130 views1 answer
Swipl gui mac
Shell/Bash
0 vote117 views1 answer
Install ghost script
Shell/Bash
2 votes132 views1 answer
Aws cli ec2 list instances
Shell/Bash
3 votes114 views1 answer
Check cpu temp linux
Shell/Bash
0 vote115 views1 answer
Docker copy file not found
Shell/Bash
16 votes121 views6 answers
Mongodb install macbook
Shell/Bash
8 votes115 views2 answers
Install gd extension php ubuntu
Shell/Bash
0 vote119 views1 answer
Install nose
Shell/Bash
9 votes114 views2 answers
Git file too long
Shell/Bash
1 vote161 views1 answer
Keep docker container running
Shell/Bash

Share