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What is the use of ‘grep’ command?
‘grep’ is a pattern search command. It searches for the pattern, specified in the command line with appropriate option, in a file(s). Syntax : grep Example : grep 99mx mcafile
cutesree
- Jun 3rd, 2010
When you want to display the lines which do not start with #, then give following command ,grep -v "^#" file1.txtif you want to serach recursively in all the directories , then give ,grep -r "string"
muru
- Nov 21st, 2006
Grep - stands for Globally Search a Regular Expression and Print. It is used to search a given string/pattern under the given path and list out all the occurances of it in a file or set of...
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How do you find OS block size in UNIX TRU64
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How do you restore deleted files in unix
neelimaracha
- Feb 22nd, 2011
If they are old files, they will be in snapshot directory Goto the directory, at which files were deleted and do cd .snapshot.Files will be present according to the dates in the respective folders lik...
poornimay
- May 22nd, 2008
Using debugfs we can restore the deleted file provided if we know the inode no. of the same file
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In which of the following order are four sections of the file system in Unix arranged 1. Boot block,Super Block,I-list and Data block 2. Boot block,Data Block,Super block and I-list 3. Boot block,Data Block,I-list and Super block 4. Super block,Boot block,I-list and Data block
Satya
- Oct 10th, 2007
Boot Block,Super Block,I-list,and Data Block..
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Where is kernel located in HP unix?
Jitendra Katiyar
- Jan 3rd, 2007
It is inside /stand directory with name of "vmunix".
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What are the kernel parameters?
RamaGiri
- Jun 11th, 2010
Kernel parameters are:1) /sbin/sysctl -a | grep sem2) /sbin/sysctl -a | grep shm3) /sbin/sysctl -a | grep file -max4) /sbin/sysct -a | grep ip_local_port_rangel
shobhitcs
- Jan 14th, 2008
Please specify it ...its not working with sun soleris version 9.0..its saying command not find
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How do you mount Linux partition on windows
tonan
- Jul 3rd, 2009
In order to mount LINUX partitions on Windows, you need to use a third party software, Windows does not provide any inbuilt utility for this. Unlike "mount" in UNIX/LINUX Windows does not provide you with a utility to access any other file system.
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Hard link and Soft link
What is the difference between hard link and soft link?
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BijaylaxmiMohapatra- Member Since Nov-2008 | Nov 29th, 2008
Hard Link
when a file is copied, both the original and copy occupy separate space on the disk.
unix allows a file to have more than one name and yet maintain a single copy on the disk. The file is then said to have more than one link or name, but all have the same inode number. This is called hard link. All attributes are identical any modification or change in one file is automatically available in the linked file. It provides some protection against accidental deletion. Let there be a file named restore.sh. You need to create another file which provides?as backup to the original file. By creating a link, you create a backup.
unix command used to create hard link?>>ln- backup.sh restore.sh
Soft Link
It doesn't have the file's content but simply provids pathname of that automatically has the contents. This is called as softlink. but incase the original file is deleted we can't get the file's content from the linked file, coz, it just provides the path name of the file. This is also known as symbolic link. Windows shortcuts?are more like symbolic links. The original file and the linked files have different inode nos.
Unix command used to create soft link>>ln-sswad_bittu
- Dec 21st, 2010
Hard Link1. Both the file and link have same inode numbers.2. If the original file is deleted, link also deleted?.3. Cannot be used to link file on another file system.4. Cannot be used to link direc...
BijaylaxmiMohapatra
- Nov 29th, 2008
Hard Linkwhen a file is copied, both the original and copy occupy separate space on the disk.unix allows a file to have more than one name and yet maintain a single copy on the disk. The file is then ...
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Portable UNIX
Why is UNIX more portable than other operating systems?
sunnypapa
- Jan 28th, 2010
Unix operating system is written in C language, hence it is more portable than other operating systems, because of this it is most popular all over the world.
abrenar
- Nov 4th, 2009
UNIX is portable because you can customize or configure it the way you want it and how you will use it.
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Find Open Ports
What UNIX command do you use to find out the open ports in a system?
Sunnyman
- Jun 29th, 2010
To determine which ports are open in Unix AIX v 6+, follow these steps: 1. Identify the services by using the netstat command as follows: # netstat -af inet The following is an example of this comman...
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What is the output of kill -3 pid ?
Pranaw
- May 6th, 2012
Kill -3 pid is used to create thread dump for the process id. This is basically used for troubleshooting and to understand what went wrong with the above process. Suppose some node of weblogic is not ...
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What permissions do we need to kill a process ?
Prasanna Natta
- Aug 11th, 2011
We need root access to kill the process.But have to check before killing process whether it is using by any user and importance of that process.
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Boot cdrom -s
when we give Boot cdrom -s which CD should be there inside cdrom ?
Jerry Gallagher
- Jan 4th, 2014
When issuing the boot cdrom -s the system install disk should be in the cdrom drive. Booting this way will allow you to boot in single user mode and hopefully repair a system.
tushar
- Jan 10th, 2013
For Booting cd in CD Rom the command is :
mount cd-rom/mount -
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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Explain Memory Partitioning, Paging, Segmentation?
arbin pun
- Feb 1st, 2014
Segmentation eliminates internal fragmentation, but it suffers from external fragmentation. Since process is broken into a number of smaller process external fragmentation should be less. partitions...
amit.bansal07
- Aug 4th, 2009
Memory Partitioning- means partitioning the memory into small units or blocks & load the data or code into the blocks, & use this data & code when required by a process.Paging- i...
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What is the command one can use to list only the directory names?
Before answering this question it is important one should know about ls command in detail in UNIX or LINUX operating system. ls command without any option is used to list files and this command list files generally in alphabetical order. That is the command list the files present in a directory with one file per line displayed on the screen. Simply using s command without any option display all files...
djapplegate
- Oct 12th, 2007
For a quick listing of Directories I use ls -d */.This lists all the dirs at the current file system level. It doesn`t follow the leaf nodes down the dir structure.
vnanda
- Jun 22nd, 2007
Find . -type d It would list the names of all the directories in current directory recursively.ThanksVikram Nanda
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How to find some particular lines in unix Vi editor which starts with a particular word and end with another particular word?? For ex - There are 10 lines in the editor and only 4 lines start with the word APPLE and end with the word MANGO.Now how to find out these particular lines in Unix?
Orions
- Dec 28th, 2006
'esc` then :/word-to-find then `enter`
UNIX Interview Questions
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