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Searching for multiple patters using grep

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# 1  
Old 05-08-2013
Searching for multiple patters using grep
i have a file as below

HTML Code:
grepfile.txt
----------------
RNTO command successful
No such file or directory
Authentication failed
if i seach individually for 'RNTO command successful' or 'No such file or directory' using grep -i as below, im gettting result.
Code:
 
grep -i 'No such file or directory' grepfile

Can someone tell me how to search for 'RNTO command successful' and 'No such file or directory' at a time.
# 2  
Old 05-08-2013
You want to search lines which have both those pattern or lines which have one of those?
If you have many patterns to search then put them in file and use -f option of grep command.
Man page will give you more information on same.
# 3  
Old 05-08-2013
I am not so sure.. But try following command if it works..

Code:
egrep -i '(RNTO command successful|No such file or directory)'  grepfile.txt

# 4  
Old 05-08-2013
Nakul sh's solution would work.

You can also write it like this:
egrep -i '(^R|^N)' grepfile.txt
# 5  
Old 05-08-2013
Quote:
Originally Posted by juzz4fun
Nakul sh's solution would work.

You can also write it like this:
egrep -i '(^R|^N)' grepfile.txt
Only if you assume that only those three types of lines appear in the file. I doubt that is the case. It is probably a simplified example.


To the OP:

In addition to vidyadhar85's advice, I would suggest using -F if your list is composed of literal strings and not regular expressions. Further, if they are intended to match an entire line, use -x to preclude a substring match.

Regards,
Alister
Last edited by alister; 05-08-2013 at 12:39 PM..
# 6  
Old 05-08-2013
Using awk
Code:
awk '/RNTO command successful|No such file or directory/'

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