I'm tring to do simple grep and grep -v so I will get the lines from a.txt that exists on b.txt and not in c.txt.

Example of 3 files

a.txt:

a
b
c
d
e

up.txt:

a.up
b.up
c.up

dw.txt:

a.dw
b.dw

Desired output:

c

I wrote the below code but the grep looks on the $(sed...) as one single line at a time and not as a whole:

sed 's/.up//' /tmp/b.txt | grep -f /tmp/a.txt | grep -vf $(sed 's/.dw//' /tmp/c.txt)

I'm trying to do simple grep and grep -v so I will get the lines from a.txt that exists in b.txt and not in c.txt.

Example of 3 files

a.txt:

a
b
c
d
e

up.txt:

a.up
b.up
c.up

dw.txt:

a.dw
b.dw

Desired output:

c

I wrote the below code but the grep looks on the $(sed...) as one single line at a time and not as a whole:

sed 's/.up//' /tmp/b.txt | grep -f /tmp/a.txt | grep -vf $(sed 's/.dw//' /tmp/c.txt)