Pipe accepts the output of one command, and feeds it as an input to the next command.eg: ls | wc -lOutput of 'ls' is fed as input to wc-l. Hence wc counts the number of lines in the result of ls.

Rahul Shukla

• May 8th, 2006

piping:- sending the output of a command to the input of another is called piping.some examples are:$cal | wcwill output total line's,word's and character's$cal | wc | wcwill output total line's,word'...

Answer Question  Select Best Answer

Rm -r *

Aijaz

• Jun 30th, 2006

#rm -fr

Answer Question  Select Best Answer

Puneet Keswani

• Sep 8th, 2006

well this question is more towards the architecture that the operating system has inherited and was predominanatly designed in a way that would have been easier for the integration and ifaster impleme...

Answer Question  Select Best Answer

Just as the name depicts pipeline is the process in which when a pipe is set between two commands then the standard output from the first command is passed through the pipe specified to the second command and thus acts as an input to the second command. In other words the standard output of the first command is pipelined as standard input to the second command. This is done by using the symbol for...

Intermachine communication is the communication between two machines. With respect to the context of UNIX operating system there are many commands available for achieving this intermachine communication. Some of them are listed below namely:
uucp:
This command is used for transferring of files between UNIX machines. There are many options available in this command to name one of which...

The make program plays a very important role in a multiprogramming operating system namely UNIX. When there is more than one file and when changes are made to the files make program keeps track automatically of the changes made to these files and recompile them as and when needed automatically. The make program takes as its input any file name or in general a file named as makefile which has in it...

This is done by using the tr command in UNIX operating system. This command in UNIX is used for translating characters from standard input.

The general syntax of this command is:

tr character_from character_to

That is in above character_from and character_to can take one or more single characters. The character_from denotes the input character and whatever...

$ ls > file1$ banner hi-fi > message$ cat par.3 par.4 par.5 >> report$ cat file1>file1$ date ; who$ date ; who > logfile$ (date ; who) > logfile

Chintz

 Profile Answers by Chintz Questions by Chintz

• Sep 27th, 2006

$ ls > file1=====>Redirects the output of ls command to file1$ banner hi-fi > message=====>Redirects the output of banner command to message$ cat par.3 par.4 par.5 >> report=====>...

Aparna

• Jul 18th, 2006

$ ls > file1writes the list of all the files in the folder into a file called file1$ banner hi-fi > messagegives an error coz of the - i guess$ cat par.3 par.4 par.5 >> reportwrites t...

Answer Question  Select Best Answer

�inode�, each file has a separate inode and a unique inode number.

Himanshu

• Nov 7th, 2006

The data structure that is used to maintain the In-Core Inode Information is "Inode Table". This table (logical representation) has the following information abt the file:- - type of the file&nbs...

Answer Question  Select Best Answer

Both the commands mean the same , the file file1 is read and its contents are copied to file2

kcube

 Profile Answers by kcube Questions by kcube

• Nov 13th, 2006

$cat file2 --- Shows the contents of the file file2$cat >file2 --- Since there is no input file specified, it takes the standard input and copies it to a new file named file2. If the file2 is already existing, it will over write the file.

jagannathreddy

• Feb 24th, 2006

The Commond  $cat file in unix is used to display the content of the file and where as commond $cat >> file is to append the text to the end of the file without overwritting the information...

Answer Question  Select Best Answer

Cat displays file contents. If the file is large the contents scroll off the screen before we view it. So command 'more' is like a pager which displays the contents page by page.

kcube

 Profile Answers by kcube Questions by kcube

• Nov 13th, 2006

The cut command cuts bytes, characters, or fields from each line of a file and writes these bytes, characters, or fields to standard output. If you do not specify the File parameter, the cut command r...

myquery

 Profile Answers by myquery Questions by myquery

• Apr 1st, 2006

In Unix, cat command is used to display the contents on to the screen$cat filenamemore command is used to diaplay a file with pausing.$more filename

Answer Question  Select Best Answer

Ls becomes the input to wc which counts the number of lines it receives as input and instead of displaying this count , the value is stored in file1.

sangee

• Nov 15th, 2006

first ls command will list all the files in the current dir.thenthat result is fed to wc -l which will count the number of lines fed by the input(ie ls ),now finally the result which is the number of lines is fed to the file1.

Answer Question  Select Best Answer

George V J

• Nov 21st, 2006

If it is a UNIXWARE system, the OS creates a core dump of system RAM ( after a system crash ) in a partition called SWAP. When the system is booted up after the crash, it will ask you to save the...

Deepa

• Aug 24th, 2006

I guess it can be done using gdb corefilename

Answer Question  Select Best Answer

sharifhere

 Profile Answers by sharifhere Questions by sharifhere

• Dec 7th, 2006

Extensively used one are:ps -eafkillfork

Divya

• Oct 23rd, 2006

System Calls for process control * fork() * wait() * execl(), execlp(), execv(), execvp() * exit() * signal(sig, handler) * kill(sig, pid)

Answer Question  Select Best Answer

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

deepak

• Dec 18th, 2006

A redirector is the client-side object that forwards I/O requests to remote files,where they are satisfied by a server..they usually run in kernel mode

Sagar

• Mar 9th, 2006

The process of redirecting the input/output of a command from standard I/O is called redirection

Answer Question  Select Best Answer

lokesh.A

• Dec 18th, 2006

Crontab -r (username) removes all the entries of that user .

arav

• Nov 6th, 2006

 first you can do crontab -l to list down the entries and then compare it with currently executing Process - check the name or path from where it's getting executed. Cheers!~arAVis~  

Answer Question  Select Best Answer

sharifhere

 Profile Answers by sharifhere Questions by sharifhere

• Jan 8th, 2007

Grep is used for pattern searching in files

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 ""

Answer Question  Select Best Answer

xxjjs

• Jan 12th, 2007

WhenUnix is running, the kernel has been loaded into the memory. Thekernel file is located in /boot, name vmlinux, usually followed bythe version

shri

• Aug 1st, 2006

/stand directory name vmunix.

Answer Question  Select Best Answer

$ echo *It is similar to 'ls' command and displays all the files in the currentdirectory.

sameer

• Jan 14th, 2007

Ya u r correct, $echo *  will give u the files in the current directory similar to ls command.

Answer Question  Select Best Answer

Kill $!

sameer

• Jan 14th, 2007

To kill the last background job, the following command is used:$ kill $!The system variable $! stores the PID of the last background job.The other method is first find the PID using the ps command, then use kill command to do the job.

Answer Question  Select Best Answer