I have an explicit path to a file:

```
/aaa/bbb/ccc/ddd/eee/fff.txt

```

I need to `cd /aaa/bbb` and perform an operation on `ccc/ddd/eee/fff.txt`.

I got the first bit figured out:

```
df_test=/aaa/bbb/ccc/ddd/eee/fff.txt
cd $( echo ${df_test} | awk -F/ '{print "/"$2"/"$3}' )

```

How do I then chop off the first two steps in the path, and operate on the remainder? Additionally, I won't know in advance how deep these files will be. I might have

```
/aaa/bbb/ccc/ddd.txt
/aaa/bbb/ccc/ddd/eee/fff.txt
/aaa/bbb/ccc/ddd/eee/fff/ggg/hhh/iii.txt

```

I just need to change directories to /aaa/bbb, and operate on the remaining relative path.