Important Linux Commands (leave, diff, cal, ncal, locate and ln)

Linux provides some important tricks. Here are a few and important one’s:

1. leave — remind you when you have to leave
   Syntax:

    leave +hhmm

   leave waits until the specified time (within the next 12 hours), then reminds you that you have to leave by writing to the TTY that you executed leave on. You are reminded 5 minutes and 1 minute before the actual time, at the time, and every minute thereafter.
   Options: hhmm The time of day is in the form hhmm where hh is a time in hours (on a 12 or 24 hour clock), and mm are minutes.

   

2. diff – compare files line by line
   Syntax:

   diff file1 file2

   Compare FILES line by line.

   

   diff -q file1 file2 

   report only when files differ

   

3. cal, ncal — displays a calendar and the date of Easter
   Syntax:

   cal

   The cal utility displays a simple calendar in traditional format and ncal offers an alternative layout, more options and the date of Easter. The new format is a little cramped but it makes a year fit on a 25×80 terminal. If arguments are not specified, the current month is displayed.

   
   

4. locate – find files by name
   Syntax:

   locate file_name

   locate reads one or more databases prepared by updatedb(8) and writes file names matching at least one of the PATTERNs to standard output, one per line.

   

5. passwd – change user password
   Syntax:

   passwd

   The passwd command changes passwords for user accounts. A normal user may only change the password for his/her own account, while the superuser may change the password for any account. passwd also changes the account or associated password validity period.

   

6. ln – make links between files
   Syntax:

   ln existing_file_name file2_name

   create a link to TARGET with the name specified
   

This article is contributed by Mayank Kumar. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above.

My Personal Notes arrow_drop_up

Save