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Setting kernel parameters
How to set kernel parameters in Red Hat Linux, AIX, & Solaris.
cmanne
- Sep 2nd, 2009
There are two methods to configure the Kernel parameters in RHEL1. by using the command "sysctl -w <parameter_name>= <value> The above command will change the kernel parameters on the f...
Manimartyr
- May 1st, 2008
Kernel parameters can be set using sysctl utility.. or try using /etc/sysctl.conf
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What is the command to view the active vg?
richa.saxena83
- Jul 28th, 2009
HPUX:# vgdisplay If the VG is ACTIVE, you will get the output else an error message "vg not active".-RK
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Usage of source command in unix
What is the use of "source" command apart from running the script in current shell?
munjalpankaj
- Jan 5th, 2010
This command takes the concept of specified file and passes it to the interpreter as text script. The return value of this would be the last command executed in the script.
mani_develop
- Oct 1st, 2009
The soure command is used for two ways. 1. If you want run the more than one command at the time. then you should write the commands in one file. which is run by source command...
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Open Source
What is the meaning of open source? How it is associated with the meaning of heavily documented?
siddharthb
- Apr 29th, 2009
Yes and Open Source Software refers to provision of source code for customization as per your need, for which good documentation is essential.Also Detailed documentation about licencing type is expected to be included.eg, GPLv2, GPLv3, Apache common Licence etc ...
mahendraselvi
- Jan 23rd, 2009
Computer software for which the source code is freely available .You can customize as per you needs.
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Masked Code
What is the number of the masked code ee@?
Sthitaprajna kar
- Mar 20th, 2017
022 is the masked code.
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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.
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When Grub is crashed then how i start the linux os?
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Superuser Privilege
How will you assign superuser privilege to an ordinary user temporarily?
abdas
- Jul 31st, 2011
Command su to be used for Acquiring superuser status
Suppose you are already logged in with a username juliet, you can get the superuser status like below.
$ su
Password: ******** -> roots password. But this is not temporary.
thumbeti
- Mar 22nd, 2011
There are 2 to do this.1) Edit /etc/passwd file by chaning the UID of the required user to "0" This makes normal user as superuser2) Using "sudo", ordinary user can execute any command with superuser privileges.
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Fetch Records from a File
What is the command to fetch first 10 records in a file?
sunil
- Jul 27th, 2011
Command as follows
HEAD -10 filename
and for lower records
TAIL -10 filenamesrnayak17
- May 20th, 2010
It would be always safe to use 'sed command'sed -n '1-10p' filename > outputfile
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COPY Command
Assume that you are NOT currently in your home directory. Enter a command to copy all files in your home directory beginning with the letter 'a' to the current directory.
sirisha
- Apr 30th, 2012
Cp [a]* /export/home/
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CPU Utilization Time
By using which command can you find the CPU utilization time?
abdas
- Jul 31st, 2011
$ iostat
tty 2/md300 2/md301 2/md302 2/md303 cpu
tin tout kps tps serv kps tps serv kps tps serv kps tps serv us sy wt id
0 4819 0 0 4 292 15 3 1 0 3 0 0 4 67 10 0 22nelgin
- Apr 6th, 2011
Top shows you current, if you want historical information, and it's configured, you can use sar.
UNIX Interview Questions
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