Shell/commands/scripting/c questions

Shell Programming and Scripting
1

  1. Can anyone explain me what the line
    x=signal(SIGINT,nh);
    does?

  2. How do I write a command to print the longest line in a file?

  3. How do I write a command to print the last word of every line of a file using sed?

  4. What exactly does this line do?
    :%s/^\([0-9]\)\([0-9]\)/\2\1/g^M
    Assuming it is run from vi.

Thank you all for your time.

2

Forgot about the rules already?

(6) Do not post classroom or homework problems

3

So from now on every question is assumed to be homework problem?

4

Blantant violations from repeat offenders such as yourself are not going to be tolerated on this site.