Hi All

This Questions and answers will be very helpful for you to how to deal with the Operating Systems,


1. Q. How do you list files in a directory?
A. ls - list directory contents
ls �l (-l use a long listing format)

2. Q. How do you list all files in a directory, including the hidden files?
A. ls -a (-a, do not hide entries starting with .)

3. Q. How do you find out all processes that are currently running?
A. ps -f (-f does full-format listing.)

4. Q. How do you find out the processes that are currently running or a particular user?
A. ps -au Myname (-u by effective user ID (supports names)) (a - all users)

5. Q. How do you kill a process?
A. kill -9 8 (process_id 8) or kill -9 %7 (job number 7)
kill -9 -1 (Kill all processes you can kill.)
killall - kill processes by name most (useful - killall java)


6. Q. What would you use to view contents of the file?
A. less filename
cat filename
pg filename
pr filename
more filename
most useful is command: tail file_name - you can see the end of the log file.

7. Q. What would you use to edit contents of the file?
A. vi screen editor or jedit, nedit or ex line editor

8. Q. What would you use to view contents of a large error log file?
A. tail -10 file_name ( last 10 rows)

9. Q. How do you log in to a remote Unix box?
A. Using telnet server_name or ssh -l ( ssh - OpenSSH SSH client (remote login program))

10.Q. How do you get help on a UNIX terminal?
A. man command_name
info command_name (more information)

-Vignesh