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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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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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What are Trace files and Log Files in Unix and How do they help in conducting back end testing?
Amit Shiknis
- Dec 8th, 2007
Hope this does anser your question - General System Information Tools/Utilitiesuname -a -- brief OS and kernel information. dmesg -- kernel messages given during booting. cat /var/log/messages -- is t...
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UNIX Maximum simultaneous logins
how many simultaneous logins are allowed in Linux/Solaris for a single user ?
Amit Shiknis
- Dec 10th, 2007
The Linux PAM (Pluggable Authentication Modules) where we can set useful limits for users or login, which can be configured in the /etc/security/limits.conf file.You can control the total limitation w...
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Inter process command
inter process command in UNIX be achieved by a)pipes b)messages c)semaphores d)shared memory e)all
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What does command "kill -9" does ?
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Write a command to display a file’s contents in various formats?
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How to save a path in command prompt to recall it later.
How can I save a path to my favorites in command prompt to recall it later?
vishpri
- Mar 9th, 2008
we have an additional command in AIX to obtaine previously used path or command at the command line without assigning that path to a variablerun set -o vi command at command prompt.this wil...
Susil Kumar
- Jan 4th, 2008
Assign the path to a variable except the environment variables. The variable will hold the value throughout the session. The scope is only to the shell it has been assigned at.Steps: ...
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What does the command “ $who | sort ‚logfile > newfile‚do?
The input from a pipe can be combined with the input from a file . The trick is to use the special symbol “-“ (a hyphen) for those commands that recognize the hyphen as std input.In the above command the output from who becomes the std input to sort , meanwhile sort opens the file logfile, the contents of this file is sorted together with the output of who (rep by the hyphen) and the sorted output...
razi_abbas
- Mar 31st, 2008
Instead of showing result on screen this redirect the output of who into a file name (newfile)Razi
ajay
- Jul 25th, 2007
Actually the command is who |sort - logfile >newfilethere should be a space between - and logfile.
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Difference between kill and kill -9
viva.srivas
- Apr 15th, 2008
Kill ---> generates SIGTERM signal requesting process to terminatekill -9 ---> generates SIGKILL signal for process to terminate immediately
Lakshmi Gunturi
- Mar 29th, 2007
Kill -9 is force termination of a job means processes which refuse to die.
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Unix & Aix
Unix & Aix what's the difference between the two.
vishpri
- Apr 24th, 2008
AIX is one of the favours of Unix and is developed by IBM. AIX stands for Advanced Interactive Executive. This name came because of an advanced feature(tool) introduced in ...
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Is it possible to restrict incoming message?
Yes, using the ‘mesg’ command.
wow_suraj
- May 7th, 2008
messages can be restricted by you with the help of 'mesg n', this will restrict the incoming of messages to your terminal, for again allowing messages for your terminal you can use 'mesg y'.
ashok kumar
- Feb 21st, 2006
Yes its by using mesgbut the command is mesg n(to restrict incomming messge)mesg y(to allow messge)
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What are your solution strategies for "Dining Philosophers Problem”?
suraj
- Oct 17th, 2005
P: philoshoferf1: forksOne solution is to order the forks and require the philosophers to pick the forks up in increasing order. In this solution the philosophers are labeled P1, P2, P3, P4, and P5 an...
suraj
- Oct 17th, 2005
/* here is a c code may help u by suraj */#include <stdio.h>#include <stdlib.h>#include <unistd.h>#include <semaphore.h>#include <pthread.h>#include "msecond....
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Why linux operating system is virus free? What is the reason behind it to free from virus?
katz04
- May 18th, 2008
The Linux OS is not virus free. It is as susceptible to viruses as other operating systems. While the relative numbers of Linux viruses is small, the number of viruses written for Linux is growing as Linux comes into widespread use.
Chulbuli
- Dec 21st, 2007
In Linus, the kernal is protected by the core and the application programes. Eve if there is any virus coming in linux has built in antivirus application which which detect the virus and protect the system from it.
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What is the use of the command "ls -x chapter[1-5]"?
Ls stands for list; so it displays the list of the files that starts with 'chapter' with suffix '1' to '5', chapter1, chapter2, and so on.
MJ
- May 8th, 2006
Yes you are correct. It stands for listing the files Chapter with suffix 1 to 5 but it will display the files in columns as with-x option.
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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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What is the difference between soft link and hard link in unix operating system ?
poornimay
- May 22nd, 2008
In Hardlink Inode is same and both are independentIn Softlink Inode is diff and the linked file will b a shortcut of first file
harish
- Nov 26th, 2006
Hi....regarding hard link .... the original file will not be deleted when you delete the hard linkit ll be deleted only when the link count becomes zero
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UNIX questions
How do u configure the Disk?Tell me Steps to configure the VG?How do u add a new disk in VG?What are the Attributes of LVM?Describe about LVM Adva/Dis.Adv?How do u find the fix is installed?How to u extend the FS?Attributes of FS?List all the LV in system?How do u find the PP size of the VG?How do u create the pp size of 32 MB in VG?What is the Limitation of VG?How do u disable the paging space?What...
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The Cost of storing a bit is minimum in 1. Cache 2. Register 3. RAM 4. Magnetic tape
raj
- May 17th, 2007
Obviously it will be in 'Magnetic tapes' as it can be unlimited and cheaper.
UNIX Interview Questions
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