Shell - ls outptu lines

[zzh@rext03-0322 ~]$ ls ~/project/deploy/mirrored
aaa  a.zip b.jwt d.09_202211071.tgz
[zzh@rext03-0322 ~]$ ls ~/project/deploy/mirrored | wc -l
4
[zzh@rext03-0322 ~]$ ls ~/project/deploy/mirrored | grep "\.zip"
a.zip