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Why is the . not included in the path?
nayakss
- Dec 10th, 2008
I don't think there is any hard and fast rule that not to include "." in the Path variable. If you need it, then you can add and add the . at the end. Like /usr/sbin:/sbin:/usr/etc:.
Rhishikesh
- Feb 16th, 2007
Yes, . means current working directory and having current directory into your path could create problem like.. I can have 'ls' command written in current directory to delete all the files
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Explain design philosophy of UNIX operating system and explain the mechanism of inter process communication and synchronisation.
rajanikanth.ha
- Aug 26th, 2008
The inter process communication is a way of communication between the processes. In UNIX these are achieved through pipes (named & unnamed pipes), semaphores, message queues, shared memory.
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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 Process Control board in UNIX?
parthvora18
- Aug 20th, 2008
Process Control Block in Unix is a data structure which is used to mange Processes. It contains following:1. PID2. Pointer to the next PCB3. Register Values4. Priority5. I/O information6. Process accounting information. 7. Adress Space.
Rakesh
- Sep 13th, 2006
I heared about the Process control block. Which will store the Pids od the processes in the system. But Process control board?? Is some thing like that exists??? Not sure!!!
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What is redirection?
Directing the flow of data to the file or from the file for input or output.Example : ls > wc
satyam.kumar2008
- Aug 9th, 2008
Whenever we run a command on shell prompt we get some output on shell prompt.In case we don't want to appear the output on the shell prompt we can redirect the output to the somewhere else. We can mak...
wow_suraj
- May 7th, 2008
redirection is used to change the default input and output source.'>' is used to redirect the output to location other than standard output terminal. If the location doesn't exist it wi...
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What is a pipe and give an example?
A pipe is two or more commands separated by pipe char '|'. That tells the shell to arrange for the output of the preceding command to be passed as input to the following command. Example : ls -l | prThe output for a command ls is the standard input of pr. When a sequence of commands are combined using pipe, then it is called pipeline.
satyam.kumar2008
- Aug 9th, 2008
The Unix commands alone are powerful, but when two or more commands get combine together, we can accomplish complex task with ease.In unix we can combine the two or more commands together to perform m...
wow_suraj
- May 7th, 2008
Pipe '|' is used to combine two or more commands to be executed at the sameinstance.Pipe redirects output of the first command (before '|') as input to the second comman...
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How to terminate a process which is running and the specialty on command kill 0?
With the help of kill command we can terminate the process.Syntax: kill pidKill 0 - kills all processes in your system except the login shell.
satyam.kumar2008
- Aug 9th, 2008
Kill -0 : All processes in the current process group are signaled. Kill -0 commnd is use to sends signal to all process and group of process.
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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.
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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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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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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 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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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 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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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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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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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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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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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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Write a command to display a file’s contents in various formats?
UNIX Interview Questions
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