/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 vote95 views1 answer
Set default permission to user for git use
Shell/Bash
9 votes91 views3 answers
Git reset remote
Shell/Bash
0 vote101 views1 answer
Debian install killall
Shell/Bash
8 votes63 views3 answers
Ubuntu remove package
Shell/Bash
3 votes100 views2 answers
The virtual environment was not created successfully because ensurepip is not available. On Debian/Ubuntu systems, you need to install the python3-venv package using the following command.
Shell/Bash
10 votes98 views2 answers
Git clean fdx
Shell/Bash
0 vote88 views1 answer
Not able to start conda navigator ubuntu 18.04
Shell/Bash
1 vote539 views1 answer
Remove package in laravel
Shell/Bash
14 votes99 views4 answers
Ubuntu check process on port
Shell/Bash
0 vote98 views1 answer
How to run pyinstaller generate application in linux
Shell/Bash

Share