Linux Informative Commands :Tutorials-2

 Here we have listed all linux commands which are used to get some information.These commands provide information about your login, environment, terminal, machine, and system. They also allow you to make some changes to these states. These are listed in alphabetic order, not in order of importance.

date to display the current date and time
 
kill to kill (or destroy) the process with a given pid (process identification number) as argument
 
logout to log out from the Unix system
 
man to get information on a Unix command;
  to look up the page in the online manual for that command
  man CC shows the pages of the Unix manual referring to the C++ compiler (CC) on the screen.
 
nslookup to find the address of a given machine
  nslookup yourmach returns the name and address of the machine yourmach, along with the name and address of its server.
 
passwd to change your current password
 
printenv to show the current environment setting
 
ps to list your current processes by their pid (process identification number)
 
setenv to change an environment setting
  setenv DISPLAY yourmach:0 tells the Xserver that the Xterminal named yourmach is where any windows created are to be displayed.
  setenv PRINTER xxx makes xxx be the default printer for any lpr or enscript commands.
 
source to reexecute a source shell script file
  source .login re-executes your .login file
  (normally executed when you log in);
useful after making changes to the .login file
  (removing the need to exit and re-login);
 
time to time the execution of a given command
  time anyunixcommand executes anyunixcommand and returns the user, system, and total time taken for the execution
 
who to list the users currently logged in to given machine;
  to find out who is logged in
 
whoami to display login of user currently logged onto given terminal;
  to answer the question: “Who am I?”

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