Bash variables: Difference between revisions
From wikinotes
Line 4: | Line 4: | ||
var="var" | var="var" | ||
FOO=${VARIABLE:=default} | FOO=${VARIABLE:=default} | ||
read -n 1 input # user input to $input | |||
</source> | </source> | ||
</blockquote><!-- Assignment --> | </blockquote><!-- Assignment --> |
Revision as of 02:04, 17 July 2021
Assignment
var="var" FOO=${VARIABLE:=default} read -n 1 input # user input to $input
test variable
test -z $var && echo "variable does not exist, or has no value" test -n $var && echo "variable exists and has a nonzero value"There are many more options. See
man test
.