Linux administration

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0. Q. How do you list files in a directory?
1. How do you list all files in a directory, including the hidden files?
2. How do you find out all processes that are currently running?

Ans: ps -f (-f does full-format listing.)
3. How do you find out the processes that are currently running or a particular user?

Ans: ps -au Myname (-u by effective user ID (supports names)) (a - all users)
4. How do you kill a process?

Ans: 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)
5. What would you use to view contents of the file?

Ans: 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.
6. What would you use to edit contents of the file?

Ans: vi screen editor or jedit, nedit or ex line editor
7. What would you use to view contents of a large error log file?

Ans: tail -10 file_name ( last 10 rows)
8. How do you log in to a remote Unix box?

Ans: Using telnet server_name or ssh -l ( ssh - OpenSSH SSH client (remote login program))
9. How do you get help on a UNIX terminal?

Ans: man command_name
info command_name (more information)
10. How do you list contents of a directory including all of its
subdirectories, providing full details and sorted by modification time?

Ans: ls -lac
-a all entries
-c by time

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