Symbol Commands

COMMAND DESCRIPTION
( ) Runs the enclosed command in a sub-shell
(( )) Evaluates and assigns value to a variable and does math in a shell
$(( )) Evaluates the enclosed expression
[ ] Same as the test command
< > Used for string comparison
$( ) Command substitution
‘command’ Command substitution
posted @ 2016-09-28 10:15  ordi  阅读(138)  评论(0)  编辑  收藏  举报