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execution problem with grep

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# 1  
Old 12-13-2011
execution problem with grep
HTML Code:
how to use grep word from  sentence  

grep -o "hai" haighaihaihai

Is above cmd possible in linux ?

can any one help me?

Thanks,
# 2  
Old 12-13-2011
Quote:
Originally Posted by kavi.mogu
HTML Code:
how to use grep word from  sentence  

grep -o "hai" haighaihaihai

Is above cmd possible in linux ?

can any one help me?

Thanks,
Code:
echo "haighaihaihai" | grep -o "hai"

# 3  
Old 12-13-2011
error in grep.
HTML Code:
thx u so much.your comment is working fine.:):):):):)
---------- Post updated at 05:13 AM ---------- Previous update was at 05:01 AM ----------

HTML Code:
Is there any possibity to find assigned value using grep ?

(e.g) grep -o "i=1"  for(i=1;i<=10;i++)

I want to fetch "1" not  i=1(whole thing)
SmilieSmilieSmilieSmilie
# 4  
Old 12-13-2011
Quote:
Code:
grep -o "i=1"  for(i=1;i<=10;i++)

This is not how grep works. By default, grep takes a file as its input. Your code is telling grep to look in a file named "for(i=1;i<=10;i++)", which obviously won't work.

Instead, echo the text you are searching and pipe it to grep:

Code:
echo "for(i=1;i<=10;i++)"  | grep -o "i=1"

Alternatively, if the code you are searching is actually contained in a file, you can do

Code:
grep -o "i=1" file

Oh, and if you only want the value assigned to i:

Code:
echo "for(i=1;i<=10;i++)"  | grep -o "i=1" | awk -F= '{ print $2 }'

where "file" is the path to the file you are searching.
# 5  
Old 12-13-2011
One more way...

Code:
grep -o "i=1" <<<"for(i=1;i<=10;i++)"

man bash
Quote:
<<<word A short form of here document in which word becomes the contents of the here-document after
any parameter expansion, command substitution, and arithmetic substitution occur.
HTH
--ahamed
# 6  
Old 12-13-2011
grep commend
HTML Code:
code working fine..thx u  so much...:):):)
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