Re: Command line text substitution
Re: Command line text substitution
- Subject: Re: Command line text substitution
- From: Paul Skinner <email@hidden>
- Date: Fri, 17 Jan 2003 07:21:11 -0500
On Thursday, January 16, 2003, at 10:19 PM, John W Baxter wrote:
At 23:56 -0500 1/10/2003, brian mather wrote:
From Paul Skinner:
Ok, I'm trying to use the right tools. What's the right CL tool for
replacing a string within a string? perl is an obvious choice. So,
how
would I replace a given string in another string using do shell
script?
--
Paul Skinner
How about sed?
sed 's/string1/string2/' filename
In the bash shell, it goes roughly like this:
[john@Zeus john]$a='I want AppleScript.'
[john@Zeus john]$b=${a/Apple/Pear}
[john@Zeus john]$echo $b
I want PearScript.
[john@Zeus john]$
The leftmost $ in those lines is the end of the prompt...start reading
after it.
Does that look something like the sed substitution? Yes
Is that an accident? No
Does it look something like the Perl substitution? Yes
Is *that* an accident? No
And I assume until testing that this would be faster since it doesn't
spawn perl or any other process. Right?
And for the determined shorteners in the crowd:
[john@Zeus john]$a='I want AppleScript.' ; echo ${a/Apple/Pear}
I want PearScript.
As for how to do it in tcsh: I don't know and no longer care. But it
should be some small syntactic variation on the above.
Copy and pasted. Works in do shell script. That is tcsh right? The
shell game is still very loose in my mind.
do shell script "a='I want AppleScript.' ; echo ${a/Apple/Pear}"
-->"I want PearScript." (unicode text)
You can have file globing wild cards in the pattern above (between the
pair
of /s, that is, Apple above). ? is any one character and * is any
string of
characters including empty...not the same as * in regular expressions.
--John
--
John Baxter Port Ludlow, WA, USA
Thanks John, for pulling me farther down the road. I loathed the
command line for so long. Now it's becoming just another app for
AppleScript to use. : )
--
Paul Skinner
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