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Most Common UNIX Commands Part - III

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Continuing the unix commands left at part II, lets get to know some more unix commands

Paste- This command is used to merge lines of file of a single file or multiple files.for example if we give
paste dummy.txt. It will display contents of file similar to cat command.

$ paste dummy.txt
aaa
bbb 
ccc

 $paste -s dummy.txt
aaa bbb ccc 

-s joins all lines of file since no delimiter is specified, default delimiter tab is being used

 $paste -d, -s dummt.txt
aaa,bbb,ccc

 -d is it the delimiter option

 $ paste file1 file2 

 In here it merges both the files parallellely merged

 nslookup - This command is used to find the ip address if you know the domain name and vice versa

 $nslookup abc.com

 Name: abc.com

Address: 209.132.183.181

 $nslookup 209.132.183.181

 Name: abc.com

 finger- This command is used to know the information of a user i.e name,home directory, last logged info etc.

 finger dvader

 [mentor.cc.purdue.edu]
  Login name: dvader                      In real life: Darth Vader
  Directory: /home/mentor/d/dvader        Shell: /bin/csh
  Last login Tue Jul 17 15:21 on ttyQ7 from expert.cc.purdue.edu

  Unread mail since Wed Jul 18 13:00:54 2001

 Tr - command copies the standard input to the standard output with substitution or deletion of selected characters. I have mainly used for converting lower case to upper case vice versa

 $ echo 'linux' | tr "a-z" "A-Z"

 LINUX

 Kill- This command is used to kill a particular or any zombie process. As we know that ps command list out all the processes along with their process id's respectively. we need process id's to kill them

kill pid

Hope this article helps you in understanding unix basic commands

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