mirror of
https://github.com/kdabir/has.git
synced 2024-09-18 17:01:29 +02:00
68 lines
1.5 KiB
Markdown
68 lines
1.5 KiB
Markdown
# has
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`has` checks presence of various command line tools and their versions on the path
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## How ?
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Download the `has` file. There is no dependency apart from `bash` itself
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$ has node npm java git gradle
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✔ node 8.2.1
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✔ npm 5.3.0
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✔ java 1.8.0
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✔ git 2.14.1
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✔ gradle 4.0.1
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If everything is good `has` exits with status code `0`. The status code
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reflects number of commands **not found** on your path.
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$ has node go javac
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✔ node 8.2.1
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✔ go 1.8.3
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✘ javac
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And echo the status:
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$ echo $?
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1
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## Installing
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Just download the `has` script in your path.
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git clone https://github.com/kdabir/has.git && cd has && make install
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If you are lazy, you can run `has` directly off the internet as well:
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curl -sL https://git.io/_has | bash -s git node npm
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✔ git 2.14.1
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✔ node 8.2.1
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✔ npm 5.3.0
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And if that's too much of typing every time, setup an alias
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alias has="curl -sL https://git.io/_has | bash -s"
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And use it
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$ has git
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✔ git 2.14.1
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## command not understood by has?
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Let's say `$ has foobar` returns `foobar not understood`, because `has` may not have whitelisted `foobar`.
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In such cases, pass `HAS_ALLOW_UNSAFE=y has foobar`. This is should still check for existance of `foobar` and tries to detect version as well.
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### ♥
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[](https://travis-ci.org/kdabir/has)
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## Demo
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[](https://asciinema.org/a/135790)
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