Shell Programming and Scripting

Hi Folks,

I need help about three things

1. First i have filename "beatiful.txt" have word "good" wants to replace that word with "bad".

2. Second I have file data.txt that containts words "p49" I want to delete that character from entire file.

3. If i grep a particular word from a file it show me all similiar charter like

I have words in a file

#cat kk
oper ouier o9u o5

#cat kk |egrep -e "o5"
oper ouier o9u o5

its showing all, how to see particular match

Code:

sed -i 's/\<good\>/bad/g' beatiful.txt

Code:

sed -i 's/\<p49\>//g' data.txt

The -o option is for showing only the part which matched.

Code:

egrep -o o5 kk

Maybe you also want the -w option which avoids partial matches (like the pattern "dog" matches "endogenous").

Incidentally, notice that egrep accepts a file name argument; it doesn't need help from the cat to open and read a file. (This is called a "useless use of cat".)

Thanks,

what about if i want to do this on particular line number.

Code:

linenumber=42
sed -i "${linenumber}s/\<good\>/bad/g' beautiful.txt
sed -i "${linenumber}s/\<p49\>//g' data.txt

lets suppose i have following lines in a file


papo-k.abcd.com
tito-k.abcd.com
reta-k.abcd.com
rtsa-k.abcd.com


how to delete tito-k.abcd.com and rtsa-k.abcd and wants to add "pola-k.abcd.com at the end of file and might be also on line2.

Thanks,
bash

Code:

sed -e 's/tito-k.abcd.com/pola-k.abcd.com/' -e '/rtsa-k.abcd.com/d' file

Regards