grep using input file as pattern to search other file
Sometimes we need to use another file which contains a multiple line that we want to use as input pattern
example:
You have
a.txta
b
c
d
e
And you want to search
a, c, e.This case you can create
input.txta
c
e
and use this command
grep -f -F input.txt a.txt
If the input txt is a list of regex you can remove the
-F option. -F, --fixed-strings
Interpret PATTERNS as fixed strings, not regular expressions.