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| author | Laurent Bercot <ska-skaware@skarnet.org> | 2015-02-26 01:48:50 +0000 |
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| committer | Laurent Bercot <ska-skaware@skarnet.org> | 2015-02-26 01:48:50 +0000 |
| commit | 4d067b3020104a8b19a34fa4d3b6e5e8f3eb036a (patch) | |
| tree | 5c5752681d5fef7837d22a5d8fb590d4b6003d1d /doc/forstdin.html | |
| parent | e1fe79a9e705e3cab8f632cdbe8e1774cdef2761 (diff) | |
| download | execline-4d067b3020104a8b19a34fa4d3b6e5e8f3eb036a.tar.xz | |
- added forstdinv2.1.1.0
- rewrote forbacktickx as a wrapper around forstdin
- removed el_obsolescent
- version: rc for 2.1.1.0
Diffstat (limited to 'doc/forstdin.html')
| -rw-r--r-- | doc/forstdin.html | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/doc/forstdin.html b/doc/forstdin.html new file mode 100644 index 0000000..e4c5534 --- /dev/null +++ b/doc/forstdin.html @@ -0,0 +1,78 @@ +<html> + <head> + <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> + <meta http-equiv="Content-Language" content="en" /> + <title>execline: the forstdin command</title> + <meta name="Description" content="execline: the forstdin command" /> + <meta name="Keywords" content="execline command forstdin" /> + <!-- <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>forstdin</tt> program </h1> + +<p> +<tt>forstdin</tt> uses its input as loop elements to +run another program. +</p> + +<h2> Interface </h2> + +<p> + In an <a href="execlineb.html">execlineb</a> script: +</p> + +<pre> + forstdin [ -p | -o <em>okcodes</em> | -x <em>breakcodes</em> ] [ -n ] [ -C | -c ] [ -0 | -d <em>delim</em> ] <em>variable</em> <em>loop...</em> +</pre> + +<ul> + <li> <tt>forstdin</tt> reads its standard input as it becomes available, +<a href="el_transform.html#split">splitting</a> it automatically. </li> + <li> For every argument <em>x</em> in the split output, +<tt>forstdin</tt> runs <em>loop...</em> as a child process, with +<em>variable</em>=<em>x</em> added to its environment. </li> + <li><tt>forstdin</tt> then exits 0. +</ul> + +<h2> Options </h2> + +<ul> + <li> <tt>-p</tt> : parallel mode. Do not wait for a <em>loop...</em> +instance to finish before spawning the next one. <em>forbacktickx</em> will +still wait for all instances of <em>loop</em> to terminate before +exiting, though. </li> + <li> <tt>-0</tt> : accept null characters on its stdin, +using them as delimiters. If this option and a <tt>-d</tt> option are +used simultaneously, the rightmost one wins. </li> + <li> <tt>-o</tt> <em>okcodes</em> : <em>okcodes</em> must +be a comma-separated list of exit codes. If the <tt>-p</tt> flag +hasn't been given and <em>loop</em> exits with one of the codes in +<em>okcodes</em>, +forstdin will run the following instances of the loop, but if the exit code is +not listed in <em>okcodes</em>, forstdin will exit immediately with an +<a href="exitcodes.html">approximation</a> of the same exit code. </li> + <li> <tt>-x</tt> <em>breakcodes</em> : like the previous +option, but with inverted meaning - the listed exit codes are codes +that will make forstdin break the loop and exit, and the unlisted exit +codes will make it keep looping. </li> + <li> Other options are used to <a href="el_transform.html">control +the substitution mechanism</a> for every <em>x</em>. Of course, you can't +split <em>x</em>. </li> +</ul> + +<h2> Notes </h2> + +<ul> + <li> You can start <em>loop...</em> with "import -u <em>variable</em>" +to perform variable substitution. </li> +</ul> + +</body> +</html> |