How to find all lines in a file that contains a particular word

Coolsafe · 11-14-2009, 06:15 AM

How to find all lines in a file that contains a particular word ? For example...let's say the word "from".

tom4everitt · 11-14-2009, 06:23 AM

It depends a little on what kind of file you're searching, and the kind of output you want. Simply

Code:

more thefile | grep from

will print exactly the lines of "thefile" that contains the word from (given that the file is a plain text file). Just write back if this was not exactly what you were looking for.

pixellany · 11-14-2009, 06:28 AM

I would do it as:

Code:

grep from thefile | more

Cool;
Got to http://tldp.org and get a copy of the Bash Guide for Beginners

Coolsafe · 11-14-2009, 06:56 AM

great. will check out bash 4 beginners. thks.

tom4everitt · 11-14-2009, 11:39 AM

Yes, elementary bash knowledge is often extremely useful for a lot of stuff that has to do with linux in general and the terminal in particular. You can actually write entire programs exclusively in bash (although its not very convenient when they grow bigger).

syg00 · 11-14-2009, 04:57 PM

Strictly speaking that won't only get "words" being searched for.
You can also get grep to show the line number of successful hits.

All expounded in the man page.

ghostdog74 · 11-14-2009, 05:53 PM

Quote:

Originally Posted by Coolsafe

How to find all lines in a file that contains a particular word ? For example...let's say the word "from".

other ways:
1) just bash shell

Code:

while read -r line
do
 case "$line" in 
    *from* ) echo "found";;     
 esac
done <"file"

2) awk

Code:

$ awk '/from/' file

3) Python

Code:

for line in open("file"):
  if "from" in line: 
     print line.strip()

4) Perl

Code:

$ perl -ne 'print if /from/;' file