Problem
1. Explain why the error message is seen at the terminal in spite of having used the 2> symbol:
$ cat < foo 2>bar ksh: cannot open foo: No such file or directory
2. How do the commands wc foo and wc < foo differ? who opens the file in each case?>
3. You want to concatenate two files, foo1 and foo2, but also insert some text after foo1 and before foo2 from the terminal. How will you do this?