mirror of https://github.com/jkjoy/sunpeiwen.git
84 lines
1.2 KiB
Markdown
84 lines
1.2 KiB
Markdown
command-exists
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==============
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node module to check if a command-line command exists
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## installation
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```bash
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npm install command-exists
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```
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## usage
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### async
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```js
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var commandExists = require('command-exists');
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commandExists('ls', function(err, commandExists) {
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if(commandExists) {
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// proceed confidently knowing this command is available
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}
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});
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```
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### promise
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```js
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var commandExists = require('command-exists');
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// invoked without a callback, it returns a promise
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commandExists('ls')
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.then(function(command){
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// proceed
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}).catch(function(){
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// command doesn't exist
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});
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```
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### sync
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```js
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var commandExistsSync = require('command-exists').sync;
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// returns true/false; doesn't throw
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if (commandExistsSync('ls')) {
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// proceed
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} else {
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// ...
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}
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```
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## changelog
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### v1.2.7
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Removes unnecessary printed output on windows.
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### v1.2.6
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Small bugfixes.
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### v1.2.5
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Fix windows bug introduced in 1.2.4.
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### v1.2.4
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Fix potential security issue.
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### v1.2.0
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Add support for promises
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### v1.1.0
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Add synchronous version
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### v1.0.2
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Support for windows
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