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nl34 avatar Ubuntu

How do I write a bash script that prints every line of one file also in second file

us flag
nl34

for example, I have 2 text files :

file1 consists of:

a 
b

file2 consists of:

a
ab
bc 
c

output should be:

$p1.sh file1 file2 
a
ab
bc

how exactly would I code this in Linux?

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lnee avatar
td flag
lnee
First im a bit confused can you tell me why you wont this for context
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nobody avatar
in flag
nobody
I think, you have wrong result for the second case `$p1.sh file2 file1`. The answer should be `cc` and not `c`. Right?
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nobody avatar Ubuntu
in flag
nobody

It can be done with grep only

grep -f file1 file2
grep -f file2 file1
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Wayne Vosberg avatar Ubuntu
bd flag
Wayne Vosberg

I'm assuming the second example (p1.sh file2 file1) should output cc as there is no line with just c in file1. If so, then:

#!/bin/bash

cat "$1" | while read m  
do
    grep "$m" "$2"
done | sort -u

example:

$ cat f1
a
b
bb
b
cc
$ cat f2
aa
ab
bc
c
$ ./p1.sh f1 f2
aa
ab
bc
$ ./p1.sh f2 f1
cc
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nl34 avatar
us flag
nl34
thank you! could you explain the logic in this code please
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