input a string and copy lines from a file with that string on it

Shell Programming and Scripting
1

i have a file1 with many lines. i have a script that will let me input a string. for example, APPLE. what i need to do is to copy all lines from file1 where i can find APPLE or any string that i specify and paste in on file 2

thanks in advance!

2

assignment here
Homework & Coursework Questions - The UNIX and Linux Forums

3

no, it's not an assignment.

string=$word

i used awk '/$word/' input_file but it failed

4

for awk

try -v option

 
awk -v word=$word ' /$word/ ' file
5

Should be:

awk -v word=$word ' $0 ~ word' file

With grep:

grep "$word" file