[SOLVED] how to delete charachters after a specific word

tripialos · 08-06-2013, 05:34 AM

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

pan64 · 08-06-2013, 05:45 AM

there is no such command, but you can write a small script (probably one-liner) to do that. What language do you prefer?

tripialos · 08-06-2013, 06:03 AM

Quote:

Originally Posted by pan64

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

colucix · 08-06-2013, 06:14 AM

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.

joe_2000 · 08-06-2013, 06:21 AM

...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="

tripialos · 08-06-2013, 06:55 AM

niiice both worked form me like charm!!! Thanks guys