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<p><FONT class=normalfont><B><font color=blue>sh与csh的比较</font></B></FONT><BR><FONT class=smallfont color=#ff9900>2004-04-23 15:18 pm</FONT><BR><FONT class=normalfont>作者：作者<br>来自：Linux知识宝库<br>联系方式：无名<br><br> 无意中在网上找到了一份关于sh与csh比较的资料(实际上原文叫Why no csh.),不知道有没有在此贴过.但本人觉得so cool.不敢独享.如果贴过我就再贴一次吧.如果没有贴过那就最好.我也不用担心被人说抄袭.如果你想转载此文章,请保留原文的完整性.当然,我的屁话就不用转了.<br>
<br>
原文:<br>
From comp.unix.shell Thu Sep 28 16:13:17 1995<br>
Path: night.primate.wisc.edu!nntp.msstate.edu!gatech!news.sprintlink.net!in1.uu.net!boulder!csnews!mox!tchrist<br>
From: Tom Christiansen <tchrist@mox.perl.com><br>
Newsgroups: comp.unix.shell,comp.unix.questions,comp.unix.programmer,comp.answers,news.answers,comp.infosystems.www.authoring.cgi<br>
Subject: Csh Programming Considered Harmful<br>
Followup-To: comp.unix.shell<br>
Date: 28 Sep 1995 18:52:45 GMT<br>
Organization: scant<br>
Lines: 560<br>
Approved: news-answers-request@MIT.Edu<br>
Expires: Fri, 1 Nov 1994 12:00:00 GMT<br>
Message-ID: <44eqtt$h7j@csnews.cs.colorado.edu><br>
NNTP-Posting-Host: perl.com<br>
Originator: tchrist@mox<br>
Xref: night.primate.wisc.edu comp.unix.shell:8718 comp.unix.questions:16357 comp.unix.programmer:10254 comp.answers:5900 news.answers:20987 comp.infosystems.www.authoring.cgi:10967<br>
<br>
Archive-name: unix-faq/shell/csh-whynot<br>
Version: $Id: csh-faq,v 1.7 95/09/28 12:52:17 tchrist Exp Locker: tchrist $<br>
<br>
The following periodic article answers in excruciating detail<br>
the frequently asked question "Why shouldn't I program in csh?".<br>
It is available for anon FTP from perl.com in /pub/perl/versus/csh-whynot.gz<br>
<br>
*** CSH PROGRAMMING CONSIDERED HARMFUL ***<br>
<br>
Resolved: The csh is a tool utterly inadequate for programming,<br>
and its use for such purposes should be strictly banned!<br>
<br>
I am continually shocked and dismayed to see people write test cases,<br>
install scripts, and other random hackery using the csh. Lack of<br>
proficiency in the Bourne shell has been known to cause errors in /etc/rc<br>
and .cronrc files, which is a problem, because you *must* write these files<br>
in that language.<br>
<br>
The csh is seductive because the conditionals are more C-like, so the path<br>
of least resistance is chosen and a csh script is written. Sadly, this is<br>
a lost cause, and the programmer seldom even realizes it, even when they<br>
find that many simple things they wish to do range from cumbersome to<br>
impossible in the csh.<br>
<br>
<br>
1. FILE DESCRIPTORS<br>
<br>
The most common problem encountered in csh programming is that<br>
you can't do file-descriptor manipulation. All you are able to<br>
do is redirect stdin, or stdout, or dup stderr into stdout.<br>
Bourne-compatible shells offer you an abundance of more exotic<br>
possibilities.<br>
<br>
1a. Writing Files<br>
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