[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: case modification won't work with pattern

From: Chet Ramey
Subject: Re: case modification won't work with pattern
Date: Thu, 10 Mar 2011 22:33:24 -0500
User-agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv: Gecko/20101207 Lightning/1.0b2 Thunderbird/3.1.7

On 3/10/11 9:04 PM, Clark J. Wang wrote:
> On Thu, Mar 10, 2011 at 9:31 PM, Greg Wooledge <address@hidden> wrote:
>> On Thu, Mar 10, 2011 at 10:22:12AM +0800, Jerry Wang wrote:
>>>       var="abcabc"
>>>       echo "var: ${var}"
>>>       echo "replace the leading \"ab\" to uppercase: ${var^ab}" # expect
>> to get "ABcabc" ?
>> The documentation is a bit terse, admittedly.
> Agree. Almost all of the poeple around me don't understand why it works that
> way. Maybe some background of the feature requirement can help us to
> understand better.

The original requests were for a way to change the first letter or
every letter to uppercase or lowercase, like ksh typeset -l/-u, using
word expansion syntax (one request was for a new builtin command to
do it).  That's what you get if you don't use the pattern part of the
expansion.  I invented the pattern following the case specifier to allow
each character to be separately modified.

``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, ITS, CWRU    address@hidden    http://cnswww.cns.cwru.edu/~chet/

reply via email to

[Prev in Thread] Current Thread [Next in Thread]