[olug] sed and sh

[Jon H. Larsen]

Would you believe I made a mistake in the code when I was merging parts of 
two different scripts?  I was defining the TRUNCFILE variable before I 
defined the FILE variable.  Such an obvious mistake on my part.

On Tue, 4 Feb 2003, Adam Haeder wrote:

> Date: Tue, 4 Feb 2003 16:32:57 -0600 (CST)
> From: Adam Haeder <adamh at omaha.org>
> Reply-To: olug at olug.org
> To: olug at olug.org
> Subject: Re: [olug] sed and sh
> 
> Looks like you're running into a problem that plagues me often. I put 
> together a nice sed regular expression match that works fine. Then I 
> incorporate it into a script, and it doesn't work.
> 
> When you put a sed script inside the backticks (`), you have to 
> DOUBLE-ESCAPE everything. So if your original sed script was
> sed s/\\//i/g (which replaces all instances of / with i
> inside ticks it needs to be
> sed s/\\\//i/g
> 
> Try it from a shell:
> 
> [adamh at adam adamh]$ cat test
> this/this
> [adamh at adam adamh]$ cat test | sed s/\\//i/g
> thisithis
> [adamh at adam adamh]$ me=`cat test | sed s/\\//i/g`
> sed: -e expression #1, char 6: Unknown option to 's'
> [adamh at adam adamh]$ me=`cat test | sed s/\\\//i/g`
> [adamh at adam adamh]$ echo $me
> thisithis
> [adamh at adam adamh]$
> 
> 
> Strange but true.
> 
> 

-- 
 [ Jon H. Larsen  - email: relayer at omahadirect dot net         ]
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