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UNIX Shell History File
Looking at history file in unix shell for a user, find 5 most often used commands.
amitkshirsagar
- Jul 18th, 2011
Try following- it will give you top most used commands along with the count of how many times they have been used:
"history | awk '{print $2}' | sort | uniq -c | sort -nr | head -5".
Gave me following output on my machine:
166 ls
156 cd
53 pwd
21 clear
10 history
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Fetch Records from a File
What is the command to fetch first 10 records in a file?
sunil
- Jul 27th, 2011
Command as follows
HEAD -10 filename
and for lower records
TAIL -10 filenamesrnayak17
- May 20th, 2010
It would be always safe to use 'sed command'sed -n '1-10p' filename > outputfile
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CPU Utilization Time
By using which command can you find the CPU utilization time?
abdas
- Jul 31st, 2011
$ iostat
tty 2/md300 2/md301 2/md302 2/md303 cpu
tin tout kps tps serv kps tps serv kps tps serv kps tps serv us sy wt id
0 4819 0 0 4 292 15 3 1 0 3 0 0 4 67 10 0 22nelgin
- Apr 6th, 2011
Top shows you current, if you want historical information, and it's configured, you can use sar.
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Superuser Privilege
How will you assign superuser privilege to an ordinary user temporarily?
abdas
- Jul 31st, 2011
Command su to be used for Acquiring superuser status
Suppose you are already logged in with a username juliet, you can get the superuser status like below.
$ su
Password: ******** -> roots password. But this is not temporary.
thumbeti
- Mar 22nd, 2011
There are 2 to do this.1) Edit /etc/passwd file by chaning the UID of the required user to "0" This makes normal user as superuser2) Using "sudo", ordinary user can execute any command with superuser privileges.
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Sleep and Wait in Linux
What is the difference between Sleep and Wait in Linux ?
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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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IBM-Aix file system question
Creating file system with already created LV and and without LV.. What is the difference between these two??
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COPY Command
Assume that you are NOT currently in your home directory. Enter a command to copy all files in your home directory beginning with the letter 'a' to the current directory.
sirisha
- Apr 30th, 2012
Cp [a]* /export/home/
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Masked Code
What is the number of masked code ee@?
Bharath Yadlapalli
- May 2nd, 2012
When kill -3 command is executed, it will quit from executing the process and additionally it will dump core for that process mentioned with pid.
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Print Using string copy and concate Commands
How will you print TATA alone from TATA POWER using string copy and concate commands in C?
Sandhya.Kishan
- Jun 15th, 2012
Include
#include
#include
int main()
{
char myString[] = "TATA POWER";
char output[10];
strcpy(output,myString);
output[4] = ;
printf("OUTPUT :%s
", output);
printf("ORGINAL STRING :%s", myString);
getch();
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What is VLAN ?
what is vlan in vio server in aix ? What is its main purpose ?
Sandhya.Kishan
- Jul 11th, 2012
VLAN stands for virtual LAN,it is a broadcast domain created by switches.With VLANs, a switch can create the broadcast domain.The purpose of VLANS is to improve network performance by separating large broadcast domains into smaller ones.
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What are the parameters in http.conf file ?
Sandhya.Kishan
- Jul 11th, 2012
Some parameters are
1.mod_rewrite
2.WLLogFile
3.DebugConfigInfo
4.StatPath
5.CookieName
6.MaxPostSize
7.FileCaching -
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 are shell variables?
Shell variables are special variables, a name-value pair created and maintained by the shell. Example: PATH, HOME, MAIL and TERM
rupesh kumar
- Dec 17th, 2013
Shell variables are special variables, a name-value pair created and maintained by the shell. Example: PATH, HOME, MAIL
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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 -
UNIX Command to Store Data
You have to store data on the system which command will you use(a) fread(b) fwrite(c) read(d) write
Jerry Gallagher
- Jan 4th, 2014
The header to this question is wrong. This is not a unix command it should be titled "C library function to store data in a file".
The answer would then be (a) fwrite.
fwrite is not operating system specific and will work the same on Unix or Windows.
hanumant
- Jul 18th, 2013
(d) write
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The root directory of disk should be placed 1. at a fixed address in main memory 2. at a fixed location on disk 3. anywhere on the disk 4. at a fixed location on the system disk
Jerry Gallagher
- Jan 4th, 2014
The root directory of disk also known as the MBR or the GUID partition is at a fixed location with replicas distributed at additional locations on the system disk determined by size.
anu
- Aug 1st, 2013
Fread.This commands reads a file and stores the file in the given folder of disk.
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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...
UNIX Interview Questions
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