Linux

Basic Linux commands

          In recent years, more people have begun to look into , explore, and try out the many features of Linux based operating System has to offer. One of the key features that Linux provides is an opportunity to use it’s terminal and command line features to perform useful operations.

Here is basic list of useful commands that can help you navigate a terminal that everyone should know.

1) Find command:

 

I’ll start with the basic find command and  some basic parameters

. -print

find -print this worked for me on my Ubuntu terminal

find .  This worked on my FreeBSD terminal
The find command can vary depending on which terminal version you are using and it often has arguments to use with the find command but they are considered optional. I strongly encourage you to find and test these commands to see what works in your terminal and remember that when using find command your privilege level matters. If you do not have a high enough user access, some of your  find results will return with a comment (you don’t have read permission).

 

Trying another parameter

find / -name “item”

 

the “/” after find will show the path names and (-name) means to do a specific search of the item you are looking for.

There’s more advance feature but this was a basic introduction of using the Find command

 

2)This command :

ps aux | sort -nrk 4 | tail

acts like a system monitor which can help you see what process is taking up the most computer power and memory.

 

3) The Command :

   Whoami

is a simple command that will help you visually see you are in the system. This matters because a person can Login as with different credentials and different privilege levels. This command will help you know who you on the fly.

 

4) The Finger command:

this will help you look up information on a User. As well there are multiple options to increase utilities of this command. Note , I had to install this package when using Ubuntu .

   finger $(input your USER)  

 

5) The command :

df -h

will display show all the disk size , what’s used, what’s available and what’s in use. Note that the [code]  -h   [/code]  is to have the output in a practical reading form as in G for gigs.

 

6) The

Locate command

  Location (file name)   

it’s similar to the find command but it’s not the same in that it is great for finding databases.

 

7) The Cat Command:

This command is often what I use when I want to get an information on particular file. Like most other commands , there are options to include with the CAT command

 CAT ( file)     

 CAT (file ) | less 

 

this helps in situation when there’s too much output and you need more specific database

 

Related Articles

  • Patching The Ghost Vulnerability

    The Ghost vulnerability, also known as CVE-2015-0235, is an exploit in a library named glibc. This library is referenced by many applications which run on your server. The exploit is...
  • How to List Compiled PHP Modules from the Command Line

    The general command is php -m; this command will give you the full list of extensions: php -m This command will give you an output like: bz2 calendar Core ctype...
  • Setting files as immutable.

    Wouldn’t it be nice if we can set files so that even root cannot modify or delete it ? Both FreeBSD and Linux come with commands that allows us to...
  • Disable SELinux

    Security-Enhanced Linux (SELinux) is a mandatory access control (MAC) security mechanism implemented in the Linux kernel. This mechanism adds an extra layer of access security to your files,directories,devices, ports and...