Unix query---

1)To display largest file in current directory.
->$ls -s|head -1

2)To display 5th line of file f1.
->$head -5 f1|tail -1
or
->$tail +5 f1|head -1

3)Remove a file name as x.
->$rm "x?"
or
->$rm x\?

4)Display last line of file f1.
->$tail -1 f1

5)To create a link between file1 and file2
->$cp -l file1 file2