find string script!

[azfar]

I need to create a script which search in a multi-line file (plain text) for a list of words from another file and after matching the pattern put only the matching word (not the whole line) into a string or redirect to another file.

any idea which commands can do it?

[lambda]

I need to create a script which...

it sounds more like you need someone else to create it for you...

[mudasir]

HI,

I think below this piece of code might do the trick

Code: Select all

#!/bin/bash

#set -x

ORI_FILE=`pwd`/file
STR_FILE=`pwd`/strings
OUT_FILE=`pwd`/match


rm -fr $OUT_FILE

for i in `cat $STR_FILE`
do
        cat $ORI_FILE | grep $i &> /dev/null
                if [ "$?" = "0" ]; then
                echo  $i >> $OUT_FILE
                fi
done

this is how i can think of it.

[lambda]

do you remember sets, and set operations? there's a nice operation called 'intersection'...

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A  = { 1, 2, 3, a, b, c }
B = { 1, 3, c, f, g }

A intersect B = { 1, 3, c }

think about how you can solve the problem with sets.

[azfar]

thanks everyone let me see them.

[azfar]

thanks Mudasir, your logic works (perhaps it reporting the matched strings not data) just tweaking it to match other requirements.

[azfar]

This worked.

Code: Select all

cat $ORI_FILE | grep -o -i $i >> $OUT_FILE

Now I can use regex as input easily because now its not going to print the input but output.

[mudasir]

Hmmm..
i forgot about the -o parameter. its been some time since i did some detailed work on linux. perhaps i am getting rusty .

anyways i am happy that some part of my small code worked for you, i did not tried it out.

lambda's approach is really out of the box, his method i think will be more efficient and fast.