C Shell: Difference between revisions
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(csh is also its own language) |
(#REDIRECT Category:C Shell. I copied the page text, because wiki prevents move to Category: namespace.) |
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#REDIRECT [[Category:C Shell]] |
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{{language |
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|exec=interpreted}}{{implementation|UNIX Shell}} |
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'''csh''' was the shell that William Joy wrote for [[BSD]]. '''csh''' accepted the same [[Unix]] commands as other shells, but had a very different syntax (for variable assignments, control flow, and such). '''csh''' is not compatible with the [[Bourne Shell]]. |
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BSD keeps the C shell at <code>/bin/csh</code>, but few persons use it. |
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[[Hashbang]] lines for C shell scripts should use the -f option: |
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<lang csh>#!/bin/csh -f</lang> |
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== Syntax == |
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{| class="wikitable" style="clear: right; width: 100%" |
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! C |
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! C Shell |
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! Bourne Shell |
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|- |
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|| <lang c>#include <stdio.h> |
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int |
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main() |
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{ |
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int n; |
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n = 13; |
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printf("%d\n", n); |
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while (n != 1) { |
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if (n % 2) |
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n = 3 * n + 1; |
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else |
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n /= 2; |
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printf("%d\n", n); |
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} |
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return 0; |
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}</lang> |
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|| <lang csh> |
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@ n = 13 |
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echo $n |
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while ($n != 1) |
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if ($n % 2) then |
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@ n = 3 * $n + 1 |
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else |
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@ n /= 2 |
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endif |
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echo $n |
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end |
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</lang> |
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|| <lang bash> |
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n=13 |
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echo $n |
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while test $n -ne 1; do |
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if expr $n % 2 >/dev/null; then |
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n=`expr 3 \* $n + 1` |
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else |
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n=`expr $n / 2` |
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fi |
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echo $n |
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done |
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</lang> |
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|} |
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<lang csh>% @ n = 10 - 3 - 2 |
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% echo $n |
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9</lang> |
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<lang csh>% @ n = (10 - 3) - 2 |
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% echo $n |
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9</lang> |
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== Links == |
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* [http://www.openbsd.org/cgi-bin/man.cgi?query=csh&apropos=0&sektion=1&manpath=OpenBSD+Current&arch=i386&format=html csh(1) manual] |
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* [http://www.faqs.org/faqs/unix-faq/shell/csh-whynot/ Csh Programming Considered Harmful] |
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* [http://www.grymoire.com/Unix/CshTop10.txt Top Ten Reasons not to use the C shell] |
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Revision as of 17:22, 9 August 2011
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