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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siva2sk

 Profile Answers by siva2sk Questions by siva2sk

• Feb 24th, 2007

got to think from OS and usage perspectives..(i am a linux & unix guy, so my explanation may seem anti-wdos)linux - monolithic kernel, open source, 1000s of reviewers, supports loadable kernel mod...

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Yes, ‘mkfs’ is used to create a new file system.

sania

• Mar 7th, 2007

Yes,mkfs -t filesystem? device name.for e.gmkfs -f ext3 /dev/hda2

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compress command is used for compressing a file that is for making the file size compact so that it becomes small. When a compress command is used in UNIX all the file attributes like the owner of the file and other things remain same except the file size is compressed and the extension of the file becomes .ZThe general syntax for compressing file iscompress filenameFor instance if one like to compress...

SureshBV

 Profile Answers by SureshBV Questions by SureshBV

• Mar 7th, 2007

Exactly as in the above comment Compress command is for compressing the file and it can uncompress when ever required.compress <filename> - to compressuncompress <filename> - to uncompress...

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sleep:
This command is used in UNIX operating system to suspend execution of the system for the specified time limit mentioned in it as parameter.
The general format of sleep command is

sleep no_of_seconds

The sleep suspends the execution of the shell in UNIX operating system for the no_of seconds specified.
For instance

sleep...

sudhir deshmukh

• Mar 8th, 2007

sleep is a Unix command line program that suspends program execution for a specified period of time.Wait The wait function suspends execution of the current process until a child has exited, or until ...

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Df -h

Chiranjeevi Manne

• Mar 30th, 2007

Use "df -k" or "df -h"

Aruna

• Jul 11th, 2006

   df and du commands  are used for checking free space on disk .    df -h or df -Humanreadable gives human readable format of free space

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Vaibhav

• Apr 3rd, 2007

This should be as below:sqlplus -s userid/password@databaseIn case you want to connect to SQL databasesqsh -S Servername -U username -P passwordIn case od SYBASEisql -S Servername -U username -P passwordRegards,Vaibhav

Ramakrishna

• Nov 23rd, 2006

Hi All,By writing the shallscript we can directly connected to oracle#!/user/bin/bashsqlplus "/as sysdba"connect SELECT distinct contactname,address FROM customers;shutdown immediate

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Answer: mt -f /dev/rmt/0 rewind

peter

• Apr 9th, 2007

#mt rewind

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Before going into the storage of semaphore it is first vital to know about semaphores. A semaphore is nothing but a term used in UNIX for a variable which acts as a counter. So the next question that comes in mind is what for we need this variable. It’s so simple. The reason is explained below. For instance there may be times when two processes try to access the same file simultaneously. In...

riteshvado

 Profile Answers by riteshvado Questions by riteshvado

• Apr 11th, 2007

On linux machines you can view semaphore using command :-ipcs -sYou can delete semaphores using ipcrm command.

brajesh

• Sep 27th, 2006

Semaphore stored inside the kernel

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Please give examples of both Daemon and Server processes. Thanks.

Sonia Chugh

• Apr 15th, 2007

A daemon is a software process that runs in the background (continuously) and provides the service to client upon request. For example named is a daemon. When requested it will provide DNS servi...

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Gaurav

• Apr 17th, 2007

The tar command archives and extracts files to  and  from  a  single  file  called  a tarfile. tar -cvf <abc.tar> /abc/*This command would bundle all the coint...

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penchal

• Apr 18th, 2007

When we run a script, it will be executed in a child shell. Changes in the child shell will not be reflected in the parent shell.For reflecting those changes, we use dot(.) command.For Example ..In a ...

vtian

• Apr 18th, 2007

./myExeSh run the script in another shell.. /myExeSh executing in  the current shell. All variable in the shell script will leave in the current shell after execution finished../myExeSh = sh myEx...

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raj

• May 17th, 2007

Deadlock:Two processes are said to be in deadlock situation if process A holding onto resources required for process B and where as B holding onto the resources required for process A.Starvation:This ...

peter

• Jan 14th, 2006

A { wait_for(lock_1) {  do something that takes time  wait_for(lock_2) {   do something  } }}B { wait_for(lock_2) {  do somet...

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Use ‘su’ command. The system asks for password and when valid entry is made the user gains super user (admin) privileges.

bkoh

• May 21st, 2007

"su" is the command to switch to a super user status (commonly known as root user) from a user shell.This command does not load the shell settings for a typical super user that login fr...

sania

• Mar 7th, 2007

Well, su - is the command that is used to switch to a super user.After that it will ask for password of root.then you are super user.

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mohit

• May 30th, 2007

In the  : dedicated mode

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Pruthvi

• Jul 12th, 2007

Hi Yes, What you said is some what correct. But it does?not fill what it supposed to. I mean operating system security is the preventic usage of hardware and software of system from viruses and invalid users.

safar

• May 13th, 2007

Operating system security means in simple to secure your data from external attack, either from intruder or any damage.RegardsSafar

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Sridhar

• Aug 24th, 2007

On Solaris CDE env, it simply takes your login id and pwd and comes out without throwing any error message.If you are on the console trying to telnet/ssh/rsh/ftp it will allow you to login.

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