/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 vote132 views1 answer
Where are paint 3d files saved
Shell/Bash
0 vote151 views1 answer
Powershell script enable tls 1.2
Shell/Bash
20 votes141 views6 answers
Github add image to readme
Shell/Bash
8 votes172 views6 answers
How to start postgresql server
Shell/Bash
10 votes129 views1 answer
How to install specific package version npm
Shell/Bash
0 vote137 views2 answers
Kubectl patch annotation
Shell/Bash
6 votes123 views4 answers
Ionic
Shell/Bash
1 vote128 views1 answer
Git name repository
Shell/Bash
3 votes92 views2 answers
Speedtest terminal
Shell/Bash
1 vote132 views1 answer
Debian bash font size
Shell/Bash

Share