grep pls help..

esham · #1 (**permalink**) 03-14-2005

Hello,

Iam trying to replace all the occurences of "hai" to all the files recursively and want to replace this by "power hai"

But in the contents there are occurences like $hai, which i dont want to replace.

Can I do the following grep

Quote:

grep '[^A-Za-z]hai[^A-Za-z]' ./
grep '^hai[^A-Za-z]' ./
grep '[^A-Za-z]hai$' ./

but this does not work for me..

Now i have to replace this to power hai..
I hope i can use sed..

Is there any one who can help in this..

Thanks in advance
Esham

Ygor · #2 (**permalink**) 03-14-2005

$ echo 'hai hail $hai thai hai' > file1
$ perl -pi -e 's/(^|[[:space:]])hai($|[[:space:]])/\1power hai\2/g' file1
$ head file1.bak file1
==> file1.bak <==
hai hail $hai thai hai

==> file1 <==
power hai hail $hai thai power hai

esham · #3 (**permalink**) 03-15-2005

Quote:

Originally Posted by Ygor

$ echo 'hai hail $hai thai hai' > file1
$ perl -pi -e 's/(^|[[:space:]])hai($|[[:space:]])/\1power hai\2/g' file1
$ head file1.bak file1
==> file1.bak <==
hai hail $hai thai hai

==> file1 <==
power hai hail $hai thai power hai

Its working perfect..
Can any one convert this to bash script.

Thanks
esham

sglinux · #4 (**permalink**) 03-15-2005

This one will work, however it prints to new line
sed 's/ /\n/g' abcd.txt | sed 's/^hai/power hai/g'

bhargav · #5 (**permalink**) 03-16-2005

what about

Code:


sed 's/^hai/ hai/g' hai.txt | sed 's/[ ]hai/ power hai/g'

esham · #6 (**permalink**) 03-16-2005

Quote:

Originally Posted by bhargav

what about

Code:


sed 's/^hai/ hai/g' hai.txt | sed 's/[ ]hai/ power hai/g'

also please explain the usage : [ ]hai

worked grea..thanks..
Is there any way to make changes in the same file...

thanks again
esham

tanku · #7 (**permalink**) 03-16-2005

perl is very useful,you should install it!
i like the look back feature. still learning a little regex..

perl -p -i -e 's/\b(?<!\$)hai\b/power hai/g' filename

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