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Where is kernel located in HP unix?
Jitendra Katiyar
- Jan 3rd, 2007
It is inside /stand directory with name of "vmunix".
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What are the kernel parameters?
RamaGiri
- Jun 11th, 2010
Kernel parameters are:1) /sbin/sysctl -a | grep sem2) /sbin/sysctl -a | grep shm3) /sbin/sysctl -a | grep file -max4) /sbin/sysct -a | grep ip_local_port_rangel
shobhitcs
- Jan 14th, 2008
Please specify it ...its not working with sun soleris version 9.0..its saying command not find
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How do you mount Linux partition on windows
tonan
- Jul 3rd, 2009
In order to mount LINUX partitions on Windows, you need to use a third party software, Windows does not provide any inbuilt utility for this. Unlike "mount" in UNIX/LINUX Windows does not provide you with a utility to access any other file system.
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Hard link and Soft link
What is the difference between hard link and soft link?
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BijaylaxmiMohapatra- Member Since Nov-2008 | Nov 29th, 2008
Hard Link
when a file is copied, both the original and copy occupy separate space on the disk.
unix allows a file to have more than one name and yet maintain a single copy on the disk. The file is then said to have more than one link or name, but all have the same inode number. This is called hard link. All attributes are identical any modification or change in one file is automatically available in the linked file. It provides some protection against accidental deletion. Let there be a file named restore.sh. You need to create another file which provides?as backup to the original file. By creating a link, you create a backup.
unix command used to create hard link?>>ln- backup.sh restore.sh
Soft Link
It doesn't have the file's content but simply provids pathname of that automatically has the contents. This is called as softlink. but incase the original file is deleted we can't get the file's content from the linked file, coz, it just provides the path name of the file. This is also known as symbolic link. Windows shortcuts?are more like symbolic links. The original file and the linked files have different inode nos.
Unix command used to create soft link>>ln-sswad_bittu
- Dec 21st, 2010
Hard Link1. Both the file and link have same inode numbers.2. If the original file is deleted, link also deleted?.3. Cannot be used to link file on another file system.4. Cannot be used to link direc...
BijaylaxmiMohapatra
- Nov 29th, 2008
Hard Linkwhen a file is copied, both the original and copy occupy separate space on the disk.unix allows a file to have more than one name and yet maintain a single copy on the disk. The file is then ...
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Portable UNIX
Why is UNIX more portable than other operating systems?
sunnypapa
- Jan 28th, 2010
Unix operating system is written in C language, hence it is more portable than other operating systems, because of this it is most popular all over the world.
abrenar
- Nov 4th, 2009
UNIX is portable because you can customize or configure it the way you want it and how you will use it.
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Find Open Ports
What UNIX command do you use to find out the open ports in a system?
Sunnyman
- Jun 29th, 2010
To determine which ports are open in Unix AIX v 6+, follow these steps: 1. Identify the services by using the netstat command as follows: # netstat -af inet The following is an example of this comman...
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What is the output of kill -3 pid ?
Pranaw
- May 6th, 2012
Kill -3 pid is used to create thread dump for the process id. This is basically used for troubleshooting and to understand what went wrong with the above process. Suppose some node of weblogic is not ...
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What permissions do we need to kill a process ?
Prasanna Natta
- Aug 11th, 2011
We need root access to kill the process.But have to check before killing process whether it is using by any user and importance of that process.
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Boot cdrom -s
when we give Boot cdrom -s which CD should be there inside cdrom ?
Jerry Gallagher
- Jan 4th, 2014
When issuing the boot cdrom -s the system install disk should be in the cdrom drive. Booting this way will allow you to boot in single user mode and hopefully repair a system.
tushar
- Jan 10th, 2013
For Booting cd in CD Rom the command is :
mount cd-rom/mount -
Explain kill() and its possible return values?
There are four possible results from this call:‘kill()’ returns 0. This implies that a process exists with the given PID, and the system would allow you to send signals to it. It is system-dependent whether the process could be a zombie.‘kill()’ returns -1, ‘errno == ESRCH’ either no process exists with the given PID, or security enhancements are causing the system to deny its existence. (On some...
csbhaskar
- Mar 4th, 2011
As we all know kill command sends a signal to the kernel. This signals are of 64 types. To list all these signals you can use kill -l. Signal no 1 -31 can be invoked by user, whereas, signal no 34-64 ...
satyam.kumar2008
- Aug 9th, 2008
Kill is one of the command in UNIX/LINux which allow user to kill/terminate one process ID or multiple processes IDs.Syntax:$kill -[options] PID$kill -9 754425The kill command send the specified signal to the specified process or process group
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How to switch to a super user status to gain privileges?
Use ‘su’ command. The system asks for password and when valid entry is made the user gains super user (admin) privileges.
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How many prompts are available in a UNIX system?
Two prompts, PS1 (Primary Prompt), PS2 (Secondary Prompt).
Linux User
- Oct 30th, 2007
Bash supports 4 prompts:PS1 - the default promptPS2 - for multi-line inputPS3 - printed for the select commandPS4 - printed before output if set -x is set(see http:// www . gnu . org/software/bash/man...
kcube
- Nov 13th, 2006
PS1 Prompt used as the normal system promptPS2 Prompt used when the shell expects more inputPS3 Prompt used when you have root authority
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Difference - Loading and Linking?
harsha419
- Jul 7th, 2009
A linker takes several object files and libraries as input and produces one executable object file (or) Linking is simply the process of placing the address of a called function into the calling funct...
abhishek
- Jan 2nd, 2007
Load -> Puts the CSECT(smallest executable unit) into main memory.Linking is a different cup of tea, this is done to make a module executable.The only way you can draw a relation between is wh...
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What is Redirection?
There are 3 types of Redirection.1)Input Redirection2)Output Redirection and3)Error RedirectionInstead of directing the input/output/error from/to the standard devices, we can direct them to/from a file
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How to read error messages in /var/adm/messages when system is not booting?
Rambo188
- Aug 23rd, 2008
If OS can't boot into multi-user level, I can try to boot the OS into single-user level.If I can't boot into single-user level, I wouldn't read the messages in /var/adm/messages.
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What is the use of crontab command in Linux Operating system?
Crontab is a very useful command used for scheduling purpose. If a person working inn Linux operating system wishes to schedule to run later they can achieve this by using the crontab command. Thus it is possible that each user working in the Linux operating system can define their own crontab. There are many options available with this crontab command. Some of them are namely:
Crontab with...vdeshpande
- Oct 29th, 2007
Crontab will keep ur jobs ongoing even when u are away crontab ***** each star has its own meanin hors days month year dayof the month plz check more on this topic @linux userforums
Bhagavan Reddy
- Apr 19th, 2007
Hi,Please explain clealy crontab command.And i want to run one shell script every 3 hours, and it should start 1 A.M and end should be 10 P.M.How to use crontab command for above requirement...RegardsBhagavan Reddy.
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What is grep() command?
Sreedhar
- Nov 12th, 2006
GREP: Global search a Regular Expression and Print it.It is used to select a word or group of words from a given file or directory etc.syntax: grep ""
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What is the difference between UNIX compress command and LINUX compress command ?I compressed a file in LINUX by using compress command, the file has been compressed successfully with the extension .gz. When i try to uncompress the file in unix, not able to uncompress the file.plz help me
sandeepypr
- May 22nd, 2008
There is no compress command in LINUX. we have to use ZIP for compressing and gunzip for uncompressing a file. in file extensions also we have difference .
Mark Young
- Nov 6th, 2007
Where you have a file extension of .gz, it is normal to use the "gunzip" command to uncompress the file. Sounds like you compress command ran "gzip" to compress the file.
UNIX Interview Questions
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