11-09-2006
Unix Interview Questions
Please please if anyone has time to answer them, this noob would highly appreciate it. Thanks in advance.
1. whats $# in a shell script
2. whats a $* in shell script
3. Explain nohup with an example
4. If $1 is the first parameter, whats $0
5. How do you see the return code of the last executed command
6. Explain Cron with an example
7. what is rsync
8. Whats the advantage of using ssh over telnet?
9. Have you used vi? provide example of searching an expression across multiple files (say *.sh) from within vi
10. How can i find all /tmp/*.zip and move them to, say, /home/to_examine (assuming the target already exists?)
11. Whats the kill command used for? Whats the difference between kill and kill -9
12. Whats the "nice" command used for
13. Provide a regular expression for searching email addresses within a script file
14. Compare /etc/fstab and /etc/mtab
15. What do you know of inodes?
16. Compare Unix FS with, say, Windows/DOS FS
17. Does UNIX FS require defraging? If yes, whats the command. If no, why? ;-)
18. How do you redirect std error to std output?
19. whats the command line for listing the names of the 10 biggest files under /home/
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exit(1) User Commands exit(1)
NAME
exit, return, goto - shell built-in functions to enable the execution of the shell to advance beyond its sequence of steps
SYNOPSIS
sh
exit [n]
return [n]
csh
exit [ ( expr )]
goto label
ksh
*exit [n]
*return [n]
DESCRIPTION
sh
exit will cause the calling shell or shell script to exit with the exit status specified by n. If n is omitted the exit status is that of
the last command executed (an EOF will also cause the shell to exit.)
return causes a function to exit with the return value specified by n. If n is omitted, the return status is that of the last command exe-
cuted.
csh
exit will cause the calling shell or shell script to exit, either with the value of the status variable or with the value specified by the
expression expr.
The goto built-in uses a specified label as a search string amongst commands. The shell rewinds its input as much as possible and searches
for a line of the form label: possibly preceded by space or tab characters. Execution continues after the indicated line. It is an error to
jump to a label that occurs between a while or for built-in command and its corresponding end.
ksh
exit will cause the calling shell or shell script to exit with the exit status specified by n. The value will be the least significant 8
bits of the specified status. If n is omitted then the exit status is that of the last command executed. When exit occurs when executing
a trap, the last command refers to the command that executed before the trap was invoked. An end-of-file will also cause the shell to exit
except for a shell which has the ignoreeof option (See set below) turned on.
return causes a shell function or '.' script to return to the invoking script with the return status specified by n. The value will be the
least significant 8 bits of the specified status. If n is omitted then the return status is that of the last command executed. If return
is invoked while not in a function or a '.' script, then it is the same as an exit.
On this man page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways:
1. Variable assignment lists preceding the command remain in effect when the command completes.
2. I/O redirections are processed after variable assignments.
3. Errors cause a script that contains them to abort.
4. Words, following a command preceded by ** that are in the format of a variable assignment, are expanded with the same rules as a vari-
able assignment. This means that tilde substitution is performed after the = sign and word splitting and file name generation are not
performed.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
SEE ALSO
break(1), csh(1), ksh(1), sh(1), attributes(5)
SunOS 5.10 15 Apr 1994 exit(1)