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| author | Laurent Bercot <ska-skaware@skarnet.org> | 2014-09-18 20:03:23 +0000 |
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| committer | Laurent Bercot <ska-skaware@skarnet.org> | 2014-09-18 20:03:23 +0000 |
| commit | f316a2ed52195135a35e32d7096e876357c48c69 (patch) | |
| tree | 5f4486b9a5a213a69e66ef574d6bc643a207981c /doc/backtick.html | |
| download | execline-f316a2ed52195135a35e32d7096e876357c48c69.tar.gz execline-f316a2ed52195135a35e32d7096e876357c48c69.tar.xz execline-f316a2ed52195135a35e32d7096e876357c48c69.zip | |
initial commit: rc for execline-2.0.0.0
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| -rw-r--r-- | doc/backtick.html | 66 |
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diff --git a/doc/backtick.html b/doc/backtick.html new file mode 100644 index 0000000..7bdc037 --- /dev/null +++ b/doc/backtick.html @@ -0,0 +1,66 @@ +<html> +<head> + <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> + <meta http-equiv="Content-Language" content="en" /> + <title>execline: the backtick command</title> + <meta name="Description" content="execline: the backtick command" /> + <meta name="Keywords" content="execline command backtick" /> + <!-- <link rel="stylesheet" type="text/css" href="http://skarnet.org/default.css" /> --> +</head> +<body> + +<p> +<a href="index.html">execline</a><br /> +<a href="http://skarnet.org/software/">Software</a><br /> +<a href="http://skarnet.org/">skarnet.org</a> +</p> + +<h1> The <tt>backtick</tt> program </h1> + +<p> +<tt>backtick</tt> runs a program and uses its output as the argument of +another program. +</p> + +<h2> Interface </h2> + +<p> + In an <a href="execlineb.html">execlineb</a> script: +</p> + +<pre> + backtick [ -i ] [ -n ] <em>variable</em> { <em>prog1...</em> } <em>prog2...</em> +</pre> + +<ul> + <li> <tt>backtick</tt> reads <em>prog1...</em> in a +<a href="el_semicolon.html">block</a> and unquotes it. </li> + <li> It runs <em>prog1...</em> as a child process and saves its +output in memory. This output must not contain a null character. </li> + <li><tt>backtick</tt> execs into the modified <em>prog2...</em>, with +<em>variable</em> added to the environment with <em>prog1...</em>'s +output as a value. </li> +</ul> + +<h2> Options </h2> + +<ul> + <li> <tt>-i</tt> : insist. If <em>prog1</em> exits non-zero, +<tt>backtick</tt> exits with the same exit code (or 111 if <em>prog1</em> +crashed for some reason). Without this option, <tt>backtick</tt> execs into +<em>prog2...</em> no matter what <em>prog1</em> does, with the null word as +<em>variable</em>'s value if <em>prog1</em> didn't write anything before +dying. </li> + <li> <tt>-n</tt> : chomp an ending newline off <em>prog1...</em>'s +output. </li> +</ul> + +<h2> Notes </h2> + +<ul> + <li> You can start <em>prog2...</em> with "import <em>variable</em> unexport <em>variable</em>" +to perform variable substitution. </li> +</ul> + +</body> +</html> |