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'...

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Rm -r *

Aijaz

• Jun 30th, 2006

#rm -fr

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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...

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$ 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...

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�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...

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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...

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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

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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.

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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

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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)

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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

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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~  

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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 ""

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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.

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$ 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.

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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.

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Answer: /etc/cron.d/cron.deny

ravikumar_koyyada

 Profile Answers by ravikumar_koyyada Questions by ravikumar_koyyada

• Jan 19th, 2007

1.To deny cron access the cron daemon checks if the file /etc/cron.deny exists and if it does then it checks all users listed there for whom cron access has to be denied.2. If /etc/cron.deny does not ...

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Shell layer manager is also called as shl in short. This utility is used for running number of scripts simultaneously at the same time in a single terminal. This utility plays a very important role in UNIX operating system because as we all know UNIX is a multi-programming operating system. So in other words there many be many instances or occurrences in which the users in the UNIX operating system...

thangaraj

• Jan 27th, 2007

It means same for dos external commands

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dave

• Feb 11th, 2007

The root user would be allowed to ftp to the server. The /etc/ftpd/ftpusers file lists users that are disallowed from using ftp.

Nagajothi

• Feb 6th, 2007

The 'root' cannot access the remote system using FTP connection.

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siva2sk

 Profile Answers by siva2sk Questions by siva2sk

• Feb 24th, 2007

oh, i forgot to answer the part about function./system. calls- function call is generally within the same protection space (ie. user mode to user mode or kernel mode to kernel mode).- system call is w...

siva2sk

 Profile Answers by siva2sk Questions by siva2sk

• Feb 24th, 2007

you should refer to a man page. both create a child process.fork - parent and child are in 'running' status. they share all page tables until one of them does a write, then on-demand paging wi...

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