接上篇文章《shell test 条件表达式说明》，其他参数说明：
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equal：在[]中使用-eq、在(())[[]]中使用==； not-equal：在[]中使用-ne、在(())[[]]中使用!=； less-than：在[]中使用-lt、在(())[[]]中使用<； less-than-or-equal：在[]中使用-le、在(())[[]]中使用<=； greater-than：在[]中使用-gt、在(())[[]]中使用>； greater-than-or-equal：在[]中使用-ge、在(())[[]]中使用>=； 逻辑操作符： and：在[]中使用-a、在(())[[]]中使用&&； or：在[]中使用-o、在(())[[]]中使用||； !:在[]中使用!、在(())[[]]中使用!; |
试验：=、!=测试
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[root@LAMP script]# [ 2 == 2 ] && echo right || echo wrong #如果2=2，则打印right，否则wrong right [root@LAMP script]# [ 2 != 2 ] && echo right || echo wrong #如果2≠2，则打印right，否则wrong wrong [root@LAMP script]# [ 2 == 3 ] && echo right || echo wrong #如果2=3，则打印right，否则wrong wrong [root@LAMP script]# [ 2 -eq 2 ] && echo right || echo wrong right [root@LAMP script]# [ 2 -ne 2 ] && echo right || echo wrong wrong [root@LAMP script]# [ 2 -eq 3 ] && echo right || echo wrong wrong [root@LAMP script]# [[ 2 == 2 ]] && echo right || echo wrong right [root@LAMP script]# [[ 2 != 2 ]] && echo right || echo wrong wrong [root@LAMP script]# [[ 2 == 3 ]] && echo right || echo wrong wrong |
试验：<、>测试
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[root@LAMP script]# [ 2 -lt 3 ] && echo right || echo wrong right [root@LAMP script]# [ 2 -gt 3 ] && echo right || echo wrong wrong [root@LAMP script]# [[ 2 < 3 ]] && echo right || echo wrong right [root@LAMP script]# [[ 2 > 3 ]] && echo right || echo wrong wrong ########################特殊备注######################## [root@LAMP script]# [ 2 < 3 ] && echo right || echo wrong right [root@LAMP script]# [ 2 > 3 ] && echo right || echo wrong right [root@LAMP script]# [ 2 \< 3 ] && echo right || echo wrong right [root@LAMP script]# [ 2 \> 3 ] && echo right || echo wrong wrong ########################特殊备注######################## |
试验：<=、>=测试
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[root@LAMP script]# [ 2 -le 3 ] && echo right || echo wrong right [root@LAMP script]# [ 2 -ge 3 ] && echo right || echo wrong wrong [root@LAMP script]# [[ 2 -le 3 ]] && echo right || echo wrong right [root@LAMP script]# [[ 2 -ge 3 ]] && echo right || echo wrong wrong [root@LAMP script]# [ 2 <= 3 ] && echo right || echo wrong -bash: [: 2: unary operator expected wrong [root@LAMP script]# [ 2 >= 3 ] && echo right || echo wrong -bash: [: 2: unary operator expected wrong [root@LAMP script]# [[ 2 \<= 3 ]] && echo right || echo wrong -bash: conditional binary operator expected -bash: syntax error near `\<=' [root@LAMP script]# [[ 2 <= 3 ]] && echo right || echo wrong -bash: syntax error in conditional expression -bash: syntax error near `3' [root@LAMP script]# [[ 2 >= 3 ]] && echo right || echo wrong -bash: syntax error in conditional expression -bash: syntax error near `3' |
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