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Old 08-06-2013, 06:34 AM   #1
tripialos
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how to delete charachters after a specific word


Greetings

I think the solution to this is something to do with sed in combination to regex.

Say i i have the above line

hellodude=12345
hellowolrd=12:34:56

and i want to erase everything after helloworld= . So in other words i want to transform the above text to:

hellodude=12345
hellowolrd=


Is there any command that could achieve that?


thanks
 
Old 08-06-2013, 06:45 AM   #2
pan64
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there is no such command, but you can write a small script (probably one-liner) to do that. What language do you prefer?
 
Old 08-06-2013, 07:03 AM   #3
tripialos
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Quote:
Originally Posted by pan64 View Post
there is no such command, but you can write a small script (probably one-liner) to do that. What language do you prefer?
bash shell should be fine i guess. Could you help how to do that?

thanks
 
Old 08-06-2013, 07:14 AM   #4
colucix
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In bash if you have the string in a variable, you can try parameter substitution to remove everything after the sign =, i.e.
Code:
var='hellowolrd=12:34:56'
var=${var/=*/=}
this in practice substitutes the = sign and the rest of the string with an equal sign alone. On the other hand if you want to change the content of a file the solution is sed (as you guessed). Something like this should do the trick:
Code:
sed -i '/hellowolrd=/s/=.*/=/'
which is practically the same as above.
 
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Old 08-06-2013, 07:21 AM   #5
joe_2000
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...or if you have the text in a file you could do

Code:
sed -e s/^helloworld=.*/helloworld=/g  /path/to/input.txt
It just takes each line that starts with "helloworld=" followed by any character sequence and replaces it with "helloworld="

Last edited by joe_2000; 08-06-2013 at 07:25 AM. Reason: Forgot the "beginning of line" symbol
 
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Old 08-06-2013, 07:55 AM   #6
tripialos
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niiice both worked form me like charm!!! Thanks guys
 
  


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