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Md Saidul Haque

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Md Saidul Haque

Md Saidul Haque
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About Linux and Linux Commands
Utility Installation
Application Installation
Development Tools and Language
Database Installation
DepOps Installation

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West, Sonmandi, 1440, Narayanganj, Bangladesh

I am Md Saidul Haque from Narayanganj in Bangladesh and working in IT industry since 2007. During my long experience journey, I have played the roles of Business Analyst, Systems Analyst, Software Architect, Technical Lead, Project Manager, Technical Researcher, Technical Consultant, as well as Web and Mobile Application developer in the...

Command	Description
ls	Lists all files and directories in the present working directory
ls-R	Lists files in sub-directories as well
ls-a	Lists hidden files as well
ls-al	Lists files and directories with detailed information like permissions,size, owner, etc.
cd or cd ~	Navigate to HOME directory
cd ..	Move one level up
cd	To change to a particular directory
cd /	Move to the root directory
cat > filename	Creates a new file
cat filename	Displays the file content
cat file1 file2 > file3	Joins two files (file1, file2) and stores the output in a new file (file3)
mv file "new file path"	Moves the files to the new location
mv filename new_file_name	Renames the file to a new filename
sudo	Allows regular users to run programs with the security privileges of the superuser or root
rm filename	Deletes a file
man	Gives help information on a command
history	Gives a list of all past commands typed in the current terminal session
clear	Clears the terminal
mkdir directoryname	Creates a new directory in the present working directory or a at the specified path
rmdir	Deletes a directory
mv	Renames a directory
pr -x	Divides the file into x columns
pr -h	Assigns a header to the file
pr -n	Denotes the file with Line Numbers
lp -nc , lpr c	Prints "c" copies of the File
lp-d lp-P	Specifies name of the printer
apt-get	Command used to install and update packages
mail -s 'subject' -c 'cc-address' -b 'bcc-address' 'to-address'	Command to send email
mail -s "Subject" to-address < Filename	Command to send email with attachment
ls-l	to show file type and access permission
Chown user	For changing the ownership of a file/directory
Chown user:group filename	change the user as well as group for a file or directory
echo $VARIABLE	To display value of a variable
env	Displays all environment variables
VARIABLE_NAME= variable_value	Create a new variable
Unset	Remove a variable
export Variable=value	To set value of an environment variable
sudo adduser username	To display value of a variable
sudo passwd -l 'username'	Displays all environment variables
sudo userdel -r 'username'	Create a new variable
sudo usermod -a -G GROUPNAME USERNAME	Remove a variable
sudo deluser USER GROUPNAME	To set value of an environment variable
finger	Gives information on all logged in user
finger username	Gives information of a particular user
SSH username@ip-address or hostname	login into a remote Linux machine using SSH
Ping hostname="" or =""	To ping and Analyzing network and host connections
dir	Display files in the current directory of a remote computer
cd "dirname"	change directory to "dirname" on a remote computer
put file	upload 'file' from local to remote computer
get file	Download 'file' from remote to local computer
quit	Logout
bg	To send a process to the background
fg	To run a stopped process in the foreground
top	Details on all Active Processes
ps	Give the status of processes running for a user
ps PID	Gives the status of a particular process
pidof	Gives the Process ID (PID) of a process
kill PID	Kills a process
nice	Starts a process with a given priority
renice	Changes priority of an already running process
df	Gives free hard disk space on your system
free	Gives free RAM on your system

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