View source for GNU bash

== test or [ <ref>http://tldp.org/LDP/abs/html/fto.html</ref><ref>http://tldp.org/LDP/abs/html/comparison-ops.html</ref> ==
{| class="wikitable"
!Command
!Comments
|-
| -d ''file''
|''file'' is a directory
|-
| -n ''string''
|the length of ''string'' is nonzero
|-
|''string1'' != ''string2''
|''string1'' and ''string2'' are not equal
|}

== References ==