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What is redirection?
Directing the flow of data to the file or from the file for input or output.Example : �ls > wc
satyam.kumar2008
- Aug 9th, 2008
Whenever we run a command on shell prompt we get some output on shell prompt.In case we don't want to appear the output on the shell prompt we can redirect the output to the somewhere else. We can mak...
wow_suraj
- May 7th, 2008
redirection is used to change the default input and output source.'>' is used to redirect the output to location other than standard output terminal. If the location doesn't exist it wi...
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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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What is the command to list files from directory in decreasing order of their file size.
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How to terminate a process which is running and the specialty on command kill 0?
With the help of kill command we can terminate the process.Syntax: kill pidKill 0 - kills all processes in your system except the login shell.
satyam.kumar2008
- Aug 9th, 2008
Kill -0 : All processes in the current process group are signaled. Kill -0 commnd is use to sends signal to all process and group of process.
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Write command to delete all the files from a directory which have been created after a specified time.
cmanne
- Sep 2nd, 2009
find -name "*.dmp" -mtime +180 -exec rm -f {} ; The above one liner will delete the files after searching for the coredump files under the specified directory path which are older than 180 days.
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How to import and export the data from databse using shell script
Markerhell
- Aug 26th, 2009
To import the data:
mysqldump -u username -p databasename >> databasenamedump.sql
To Export the data:
mysql -u username -p newdatabasename < databasenamedump.sql
anuraggupta81
- Sep 18th, 2007
Following command will be used for import from shell scriptimp [DBA User/DBA Password] FILE= [File Name] FROMUSER=[User from which the dump is taken] TOUSER=i[user to which the dump will be imported]&...
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How do you get current CPU utilization, memory and disk space usage in Linux/Unix?
What are the commands?
karkhile_rahul
- Jun 5th, 2009
We can find the CPU utilization by using topas command.and memory utilization by svmon command
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Proxy Server IP
Command to find the IP of an Proxy Server in UNIX
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Connect Remote Terminals
What is the command to connect to remote terminals?
Suresh
- May 24th, 2019
#ssh username@servername
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What are the different process states?
russpark
- Sep 29th, 2010
This varies by individual Operating System Vendor (AIX, HPUX, etc...) -here's what the man page for the ps command in hpux 11i v1 says: &...
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Write a shell script to list only the hidden files in the current directories? What is the o/p of following command $a =*, echo $a, echo "$a"? Which of the following is allowed in an arithmetic involving expr instruction. [],{},()? If values "hi", "Hello","Bye","Good Bye" are supplied to the following statement what will be the o/p read n1,n2 , echo $n1 $n2? How do you know that how many commands can be stored in the buffer in one session?
Markerhell
- Aug 26th, 2009
1. ls > a.txt | ls -a > b.txt | diff a.txt b.txt 2. echo $a will print the list of all the files in the directory in row manner. echo "$a" will print * on t...
raj
- May 17th, 2007
You can get them by just giving ls -ax | head -2
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What is relative path and absolute path?
Absolute path : Exact path from root directory.Relative path �: Relative to the current path.
mmakoko
- Jul 25th, 2009
Absolute path: Exact path from root directory to the target directory.Relative path: Path for current directory to target directory.
shyam82
- Apr 21st, 2009
Relative path name is relative to current directory. Following notations are very heplful.1* denotes current directory2** denotes parent directoryAbsolute path name is full path name. Each directory a...
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What is the unix command used for giving or changing the permissions for files and folders?
cmanne
- Sep 2nd, 2009
the best was is to use CHOWNExample:chown owner:group chown -R owner:group <---- This will change the owner and group of all the files inside the directory recursively.
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Hello does anyone know how to do the following using some simple unix if possible:I have a file with the following info as comma separated. It shows username, id number and what subjects they are enrolled in. The subjects are separated by colons. UserName,ID,Subjectjsmith,235456939,MATH29879:PHYS45979jdoe,750378929,ENGL36899:JAPN92576I want it to have one username with one course per line. So that it would look like:jsmith,235456939,MATH29879jsmith,235456939,PHYS45979jdoe,750378929,ENGL36899jdoe,750378929,JAPN92576Does anyone have any ideas?Thnx-J
ppravinreddy
- Aug 30th, 2007
use below command:$ cat t.txtjsmith,235456939,MATH29879:PHYS45979jdoe,750378929,ENGL36899:JAPN92576$ cat t.txt|sed "s/:/,/g"|awk -F"," '{OFS=","; print $1,$2,$3;print...
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How will u list the contents of parent directory from the current directory? What are the default system wide permissions for a file and directory? What is the default umask value?A user is not able to change the permission , What can it happen? What's the difference between ls -F , ls -p? If a file permission are 000, can the superuser still read and write to that file.? What's the command to remove the files without write permission? How will u make sure that no one can see the files which u had created? How will u change the permissions of a directory recursively? Any response will be greatly appreciated?
Markerhell
- Aug 27th, 2009
1. ls ../2. for files: 644 for directory: 7553. default umask value: 0224. He must not be having permissions to access the file, so cant even change the permission of the file5. When...
rps1007
- May 12th, 2008
Ls .. gives the content of the parent directoryls ../.. gives the content of parent's parent's direcoty
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Construct pipes to execute the following jobs?
1. Output of who should be displayed on the screen with value of total number of users who have logged in displayed at the bottom of the list.2. Output of ls should be displayed on the screen and from this output the lines containing the word �poem� should be counted and the count should be stored in a file. 3. Contents of file1 and file2 should be displayed on the screen and this output should be...
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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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How to grep directories
How to grep directories has reached above 80% from the df output using basin grep command.below are the steps i have used
df -h > date.ksh
grep "%" date.ksh >space.ksh
cut -c 40-44,45-80 space.ksh > %.ksh
grep "[80-10][0]%" %.ksh
see the output after above cmd
$ grep "[80-10][0]%" %.ksh
100% /opt/tivoli/tsm
80% /prod/users/edw
UNIX Interview Questions
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