How to extract the characters after a forward slash using awk

Question

How can I extract the substring after a / and compare the extracted value against another file ?

cat file 

/abc|98357|
abc/aabb|023947|
xyz/0102|293847|
pqr/pqrst|29384|
9864/truse|253123|

expected output :-

abc|98357|
aabb|023947|
0102|293847|
pqrst|29384|
truse|253123|

And then compare col 1 of file 1 with another file :-

aabb
pqrst
truse

Answer 1

awk -F'/' '{print $2}' file

produces your "expected output".

---

And then compare col 1 of file 1 with another file.

If you mean, "only print matching lines in file2 that match the first column of your 'expected output'", then the answer could be

comm -12 <(awk -F'[/|]' '{print $2}' file | sort) <(sort file2)