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tldr/pages.zh/common/[.md
Gabe Livengood 9d865abee1
test: Use POSIX-compliant example for equals comparison (#11728) 
* [: use posix-compliant example for equals comparison

the previous example worked fine for bash, but some
other shells (zsh, in my case) will not work when
using "==" for comparison. the posix spec only requires
"=", so I think it makes a little more sense to use
that in the example.

* test: use posix-compliant example for equals comparison

the previous example worked fine for bash, but some
other shells (zsh, in my case) will not work when
using "==" for comparison. the posix spec only requires
"=", so I think it makes a little more sense to use
that in the example.
2023-12-14 20:31:13 +05:30

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检查文件类型，比较数值。 如果条件计算结果为真返回 0，如果计算结果为假返回 1。 更多信息：https://www.gnu.org/software/bash/manual/bash.html#index-test.

  • 测试一个给定的变量是否等于/不等于指定的字符串：

[ "${{变量}}" {{=|!=}} "{{字符串}}" ]

  • 测试一个给定的变量是否等于/不等于/大于/小于/大于等于/小于等于指定的数字：

[ "${{变量}}" -{{eq|ne|gt|lt|ge|le}} {{数字}} ]

  • 测试指定的变量的值是否非空：

[ -n "${{变量}}" ]

  • 测试指定变量的值是否为空：

[ -z "${{变量}}" ]

  • 测试指定文件是否存在：

[ -f {{路径/到/文件}} ]

  • 测试指定目录是否存在：

[ -d {{路径/到/目录}} ]

  • 测试指定文件或目录是否存在：

[ -e {{路径/到/文件或目录}} ]