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Old 06-20-2007, 12:05 PM   #1
unixlearner
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Need a script to search and replace text in file using shell script


Hi Gurus,

I am very new to unix and currently learning.

I need a help. My concern is how to find a text in a file and replace the same with the another text value. The find and replace text values will be passed through the command propmpt something like:

searchreplace.sh <searchtext arg> <replacetext arg>

Appreciate if your help in advance.

Thanks,

Smitha
 
Old 06-20-2007, 12:21 PM   #2
wjevans_7d1@yahoo.co
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The first step in scripting is figuring out exactly what you want done. Exactly.

Sure, you want to replace text, and you attempt to show how this would work on the command line. A good first step.

But do you want to specify the input and output file names in that command also? Or is that command just supposed to be a filter (in which case a simple, one-line sed command should work, with no script necessary)?

Or what?

If you don't know what a "filter" is, drop everything and google:

Code:
bash tutorial
because there is much you need to read before starting out.

Hope this helps.

Last edited by wjevans_7d1@yahoo.co; 06-20-2007 at 12:23 PM.
 
Old 06-20-2007, 12:22 PM   #3
nx5000
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Is this homework?
 
Old 06-20-2007, 12:59 PM   #4
Tinkster
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Looks like it to me :}

Someone w/o an idea of shell-scripting wouldn't have worded
the request like:
searchreplace.sh <searchtext arg> <replacetext arg>


:}

Cheers,
Tink
 
Old 06-20-2007, 01:54 PM   #5
unixlearner
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Thanks for your replies.

Yes it is a home work and Tinkster is correct.

Tinkster comments
Someone w/o an idea of shell-scripting wouldn't have worded
the request like:
searchreplace.sh <searchtext arg> <replacetext arg>

Appreciate if you could let me know what should be the correct wording? Afterall, it is a learning curve to me

Smitha
 
Old 06-20-2007, 04:53 PM   #6
Tinkster
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Well.... the wording is fine :} ... it just suggests that those aren't
your own words as it contradicts the statement that you're new to
scripting.

To be efficient with shell scripting you need to know the basic
command line tools. Read the man pages for grep, sed, and maybe
awk. Also scour this forum for those tools. You'll find tons
of useful examples.

And no, no one here will do your homework for you :}



Cheers,
Tink
 
Old 06-21-2007, 02:09 AM   #7
chrism01
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you might want to read part (or more) of this: http://coewww.rutgers.edu/www1/linux...ute/index.html
 
Old 06-21-2007, 04:16 AM   #8
ghostdog74
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the first step to be efficient in shell script: Know your Shell! after that, learn the tools..
 
Old 06-21-2007, 04:51 AM   #9
jschiwal
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The manual for coreutils has instructions on almost 100 common commands, like cat, split, sort, etc. It is a must read.
 
Old 06-21-2007, 05:12 AM   #10
nc3b
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Here you go
http://sed.sourceforge.net/sed1line.txt
 
Old 06-21-2007, 07:19 AM   #11
kambrish
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use sed command : (substitute)

eg:

sed s#\"FindThis\"#\"ReplaceWithThis\"# \"InThisFile\"
 
Old 06-21-2007, 02:00 PM   #12
wjevans_7d1@yahoo.co
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Quoth tinkster:

Quote:
And no, no one here will do your homework for you :}
There's a reason for this. kambrish, you're not helping.
 
Old 06-21-2007, 06:21 PM   #13
Tinkster
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Quote:
Originally Posted by kambrish
use sed command : (substitute)

eg:

sed s#\"FindThis\"#\"ReplaceWithThis\"# \"InThisFile\"
OK, it appears that we do have new eager beavers who ignore rules
and solve homework issues for others. The stocks, the stocks!! :D



Cheers,
Tink
 
Old 06-21-2007, 07:26 PM   #14
jschiwal
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Is this one OK?

sed 's/searchtext/DO YOUR OWN HOMEWORK! That is how you learn./'
 
Old 06-21-2007, 10:37 PM   #15
kambrish
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i am sorry if i have break the rules. i was just trying to resolve the query. Will take care next time!!
 
  


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