Essential Linux Commands for Backend Engineers

As a backend engineer, using the terminal is essential; this guide reviews common to advanced Linux commands.

Basic Linux Commands

sudo Command

sudo (superuser do) allows execution of tasks requiring root privileges. Syntax: sudo [options] command Common options include: -l or --list: list allowed commands. -v or --validate: validate and extend timestamp. -k or --reset-timestamp: reset timestamp. -u user : run as another user. -i: interactive root shell.

cd Command

Change directory: cd /home/username/Documents or shortcut cd ~/Documents. Useful shortcuts: cd .., cd ~username, cd -.

ls Command

List directory contents: ls. Common options: -l, -a, -h, -R, -t, -lh.

cat Command

Display file contents: cat filename.txt. Create file: cat > filename.txt. Concatenate files: cat file1.txt file2.txt > file3.txt. Reverse display: tac filename.txt.

Log Query

tail Command

Show file end: tail [options] filename. Options: -n num, -f, --pid=PID, -n +num.

File and Directory Operations

mkdir Command

Create directories: mkdir [option] directory_name. Options: -p, -m, -v.

cp Command

Copy files/directories: cp filename.txt ~/Documents. Recursive copy: cp -R ~/Documents ~/Documents/All.

mv Command

Move or rename: mv file.txt ~/Documents or mv old_file.txt new_file.txt. Recursive force move: mv -rf ~/src ~/dest.

rmdir and rm Commands

Remove empty directory: rmdir empty_folder. Remove files: rm filename.txt with options -i, -f, -r.

chmod Command

Change permissions: chmod [option] [permission] file_name. Example: chmod 777 filename.txt. Options: -c, -f, -v.

chown Command

Change ownership: chown [option] owner[:group] file(s).

Download Commands

wget Command

Download files: wget [option] [url].

apt-get Command

Package management: apt-get [options] (command). Common commands: update, upgrade, check.

Mastering these Linux commands equips backend developers with essential skills for efficient terminal work.