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Old 08-09-2005, 03:12 AM   #1
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Some basic Questions in Linux

Hi, might someone help me with some basic questions in Linux?

1.How can I fetch line number 7 from file ‘f1’ ?
a. tail -7 f1 | head -1
b. tail +7 f1 | head -1
c. head -7 f1 | tail -1
d. answers b & c are correct.

2.What’s the outcome of ‘ls 2>&1’ ?
a. regular ls.
b. all the errors will go to /dev/null.
c. all the errors will go to &1, which is the first Shell I open.
d. search for the file ‘2>&1’.

3.How can I find all the directories under ‘/etc’ and dispose all the errors?
a. find –type dir |& /dev/null.
b. ls –R /etc | find –type d > /dev/null
c. find /etc –type d 2> /dev/null.
d. find /etc –type d -noerr

4.What’s the use of ‘/dev/null’?
a. It’s a block device file.
b. It’s a device file for writing errors to.
c. It’s a device file for writing special logs to.
d. It’s a device file. What ever you send it, the system deletes.

5.How can I redirect a process output to a log file, and also see it on screen?
a. someproc > pipefile | logfile.
b. someproc | tee logfile screen
c. tee someproc | logfile
d. someproc |tee logfile

6.What’s the purpose of ‘X’ permission on a directory?
a. run the directory as a special process.
b. load the directory to the ram (memory).
c. enables to enter the directory and all of the dirs below it.
d. If a directory doesn’t have it, you can’t access it and all it’s sub-dirs.

7.Default router (or Gateway) is a must on a LAN enabled machine:
a. yes.
b. no.
c. yes, but only when I want to exit the LAN.
d. no, if I use real IP addresses for all my machines, but it’s rare.

8.How do I know the process status?
a. looking at ‘/proc/sys’.
b. by using ‘ps -ef’.
c. look at his ‘status’ field at the process table, using some command.
d. non of the above.

9. what is a:
shell, terminal/console/pts, telnet,
ftp basics, ssh, basic man.
Xwindows, Window manager

10.What those commands does:
ls –R / cd ../../.. pwd
cp –rf /home/user /tmp mv –f /bin/ls .bashrc
rm –rf / (don’t try it…) chmod 764 /home/user
chown root:sys /root/f1 ps –ef | grep pts
head -5 /etc/passwd tail +3 /etc/passwd
rpm –qf /bin/ls grep something /etc/passwd
Old 08-09-2005, 03:29 AM   #2
Registered: Jan 2005
Location: Between the chair and the desk
Distribution: Debian Sarge, kernel 2.6.13
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Trying to get your homework done, eh? You could find answers for these from man pages and/or Google searches. Read the rules:
Old 08-09-2005, 03:43 AM   #3
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Try the commands and see, except for the `rm -rf /` which it tells you not to try anyway
Old 08-09-2005, 01:49 PM   #4
Registered: Nov 2002
Location: Kent, England
Distribution: Debian Testing
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The Rules you signed up to state:
Do not expect LQ members to do your homework - you will learn much more by doing it yourself.
. And so this thread is closed.

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