grep used to filter a specific keyword, from a given file or text. This is done by using the pipe or regular expression.
Example: cat filename | grep "Hello"
less is a command-line tool, which Helps to display a file content on screen . This is best tool than other code-editors while accessing large-files.
Example: less filename
locate helps to find and show where a file or directory is located,from your whole file system.The command performs the search using a database containing bits of files with the corresponding paths in the system.
Example: locate filename
chown use to change the ownership permission of a file or directory for a specific user/group.
Example: chown username filename
trace command prints the route that a packet takes to reach the host.It is useful when you want to know about the route and about all the hops that a packet takes.
Example: traceroute url
Date: 18/12/2014e.c
Nathan Hailu