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thejandroman/gist:ee76354b940a4c9908ff540fa54cb340

Created May 4, 2016 16:47
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gistfile1.txt
bash-3.2$ echo $VAR
bash-3.2$ if [ -z $VAR ]; then echo ‘variable is unset’; fi
‘variable is unset’
bash-3.2$ if [ ! -z $VAR ]; then echo ‘variable is set’; fi
bash-3.2$ VAR=''
bash-3.2$ if [ -z $VAR ]; then echo ‘variable is unset’; fi
‘variable is unset’
bash-3.2$ if [ ! -z $VAR ]; then echo ‘variable is set’; fi
bash-3.2$ VAR='test'
bash-3.2$ if [ -z $VAR ]; then echo ‘variable is unset’; fi
bash-3.2$ if [ ! -z $VAR ]; then echo ‘variable is set’; fi
‘variable is set’
bash-3.2$ unset VAR
bash-3.2$ if [ -z $VAR ]; then echo ‘variable is unset’; fi
‘variable is unset’
bash-3.2$ if [ ! -z $VAR ]; then echo ‘variable is set’; fi
bash-3.2$
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