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shell.coffee 290 Bytes
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exports.unescape = (w) ->
    w = if w.charAt(0) is '"'
        w.replace(/^"|([^\\])"$/g, '$1')
    else
        w.replace(/\\ /g, ' ')
    w.replace(/\\("|'|\$|`|\\)/g, '$1')

exports.escape = (w) ->
    w = w.replace(/(["'$`\\])/g,'\\$1')
    if w.match(/\s+/) then '"' + w + '"' else w