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From:	Bob McGowan <Bob_McGowan AT symantec DOT com>
To:	"cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
Date:	Fri, 14 Nov 2014 10:10:21 -0800
Subject:	Re: sed anomaly in bash script
Message-ID:	<D08B838A.67F5%bob_mcgowan@symantec.com>
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On 11/14/14, 9:20 AM, "cyg Simple" <cygsimple AT gmail DOT com> wrote:

>$ TEST=`echo 'c:\windows' | sed -e s.\\.\\\\.g`
>$ echo $TEST
>c:\\windows
>
><file name=sed.sh>
>TEST=`echo 'c:\windows' | sed -e s.\\\.\\\\\.g'
>echo $TEST
></file>
>
>$ bash -x sed.sh
>++ echo 'c:\windows'
>++ sed -e 's.\.\g'
>sed -e expression #1, char 7: unterminated 's' command
>+ TEST=
>+ echo
>
>CYGWIN_NT-6.1 HOSTNAME 1.7.32(0.274/5/3) 2014-08-13 23:06 x86_64 Cygwin
>
>Does anyone have a suggestion on turning c:\windows into c:\\windows?
>
>Thanks,
>-- 
>cyg Simple
>

The combination of shell globbing and sed metacharacters, with appropriate
escaping, is rather difficult, and nearly impossible to read.

I would suggest using the 'sed -f file' so you can completely eliminate
any shell processing.

The file should contain the string 's/\\/\\\\/', without the quotes ;)

Of course, if you want your script to be in a single file, this won't
work, so one of the other responders answers may be more suitable.

FYI, I would suggest not using the dot as a pattern separator, it could be
confusing to novice readers, and also removes it as a pattern match
character.

Bob


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