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Wednesday, 17 September 2014

UNIX Commands Interview Questions and Answers

Question: How to create readonly file?
touch fileName.txt
chmod 400 fileName.txt


Question: How to get the OS in unix?
uname -a


Question: How do you know if a remote host is alive or not?
ping www.example.com
telnet www.example.com


Question: How to copy from one host to another host?
scp file.zip [email protected]:/foldername


Question: How do you find which process is taking how much CPU?
top


Question: How do you check how much space left in current drive
dh-h

Question: How to Restart Apache over the SSH?

/etc/init.d/apache2 restart


Question: How to Stop Apache over the SSH?

/etc/init.d/apache2 stop


Question: How to Start Apache over the SSH?

/etc/init.d/apache2 start


Question: How to Restart Httpd over the SSH?

service httpd restart


Question: How to Stop Httpd over the SSH?

service httpd stop


Question: How to Start Httpd over the SSH?

service httpd start


Question: Import database from sql file to mysql?

mysql –u username –p databasename tablename < sqlfilename.sql


Question: How to delete ALL files including sub directory in current directory with prompting each time?

rm –r *


Question: How to display first 7 lines of file?

head -7 fileName.txt


Question: How to display Last 7 lines of file?

head -7 fileName.txt


Question: How to reverse a string in unix?

echo "Web technology expert notes" | rev


Question: How to unzip a file in Linux?
unzip –j file.zip


Question: How to test if a zip file is corrupted in Linux?
unzip –t file.zip


Question: How to find hidden files in current directory?
ls -lrta


Question: How to check if a file is zipped in Unix?
file file.txt //file.txt: ASCII text


Question: How to check all the running processes in Unix?
ps –ef


Question: find all files in current and subdirectories which contains 'webtechnology' name?
find . -name 'webtechnology'


Question: How to make any script file executable?
chmod 755 *.sh


Question: How to kill process in unix server?
kill -9 #pid

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