Linux: Learning the terminal

Some basic/essential commands are listed here to get started with linux.

You can use TAB for auto completion of a command or files/directories name, double TAB to see available options for auto completion. Also, files/directories are case sensitive,

cd Desktop/ and cd desktop/ are different things.

File System Commands

pwd — print working directory
cd — change directory
cd .. — go one directory back
ls — list
ls -la — list hidden files/folders, also shows permissions and more
cp — copy
mv — move
rm — remove
mkdir — make directory
rmdir — remove directory
rmdir -rf — remove directory with contents
touch — create a file
cat — view contents of files
echo “hello” > hi.txt — create/overwrite a file (hi.txt) with hello as content
echo “hello” >> hi.txt — append to file (hi.txt) with hello as content
nano/vi/vim — terminal based text editors
find/locate/whereis — search for files and binaries
man — open manual page

Users and Privileges

There are 3 groups — owner, members of owners’ group, other users.
chmod — change mode (set permission)
adduser — add a new user
/etc/passwd file contains available users in the system.
/etc/shadow file contains hashed passwords for available users.
su — switch user
passwd — change password

Network commands

ifconfig — interface configuration
iwconfig — dedicated to wireless networking interfaces
ping — checks if a host can accept packets
arp -a — displays ip address and mac address associated
netstat -ano — displays active connections

Service commands

service apache2 start — start an apache server
python -m SimpleHTTPServer 80 — start a python server on port 80
sysctl enable postgresql — starts postgresql on boot

Go to a directory and start python SimpleHTTPServer to start a python server with the present working directory as the home directory for the server. This can replace apache server where default home directory for the server is /var/www/html Installing and Updating Tools

apt update && apt upgrade — update and upgrade
apt install wpscan — install tool (wpscan)
git clone — clone a github directory to the system

Let me know if you find any mistake and suggestions are appreciated.

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