Fifty Useful Linux Commands Part Two

Introduction

After part one we will look into more linux commands to enhance our use of commandline and troubleshoot any problems.

ln - Create hard or symbolic links to files.
```
ln -s /path/to/source/file link_name
```
uptime - Display system uptime and load averages.
```
uptime
```
who - Display information about logged-in users.
```
who
```
whatis - Display one-line manual page descriptions.
```
whatis command_name
```
chroot - Change the root directory for a command.
```
chroot /new/root /bin/bash
```
which - Display the path of an executable.
```
which command_name
```
uptime - Display system uptime and load averages.
```
uptime
```
nmcli - Command-line client for NetworkManager.
```
nmcli connection show
```
rsync - Sync files and directories between systems.
```
rsync -avz source/ destination/
```
cut - Remove sections from lines of files.

cut -d, -f2 file.csv

sed - Stream editor for text manipulation.

sed 's/old_text/new_text/' file.txt

awk - Text processing tool for data extraction.

awk '{print $1}' file.txt

sort - Sort lines of text files.

sort file.txt

uniq - Remove duplicate lines from sorted files.

sort file.txt | uniq

diff - Compare files line by line.

diff file1.txt file2.txt

tar - Archive and compress files.

tar -cvzf archive.tar.gz directory/

crontab - Schedule repetitive tasks using cron.

crontab -l
crontab -e

wget - Download files from the internet.

wget https://example.com/file.zip

curl - Transfer data to/from servers.

curl -O https://example.com/image.jpg

zip and unzip - Create and extract compressed zip archives.

zip archive.zip file1.txt file2.txt

ps - Display information about running processes.

ps aux

kill - Terminate processes.

kill process_id

killall - Terminate processes by name.

killall process_name

nice - Adjust process priority.

nice -n 10 command

renice - Change the priority of a running process.

renice -n 5 -p process_id

whereis - Locate the binary, source, and manual page files for a command.

whereis command_name

alias - Create shortcut commands.

alias ll='ls -al'

file - Determine file type.

file file.txt

df - Display disk space usage.

df -h

du - Display file and directory space usage.

du -sh /var

quota - Manage disk quotas for users.

quota -u user

ssh-keygen - Generate SSH key pairs.

ssh-keygen -t rsa

ssh-copy-id - Copy SSH keys to a remote server.

ssh-copy-id user@remote_server

scp - Securely copy files between systems.

scp file.txt user@remote_server:/path/to/destination/

ping - Check network connectivity.

ping google.com

traceroute - Trace the route packets take to a destination.

traceroute google.com

netstat - Display network connections, routing tables, interface statistics, masquerade connections, and multicast memberships.

netstat -tuln

ss - Display socket statistics.

ss -tuln

route - Display and manipulate IP routing table.

route -n

hostname - Display or set the system’s host name.

hostname

history - View command history.

history

shutdown and reboot - Shutdown or restart the system.

sudo shutdown -h now
sudo reboot

file - Determine file type.

file file.txt

lsblk - List block devices.

lsblk

parted - Disk partitioning tool.

parted /dev/sdX

nmcli - Command-line client for NetworkManager.

nmcli connection show

useradd and userdel - Add and delete user accounts.

sudo useradd newuser
sudo userdel olduser

groupadd and groupdel - Manage user groups.

sudo groupadd mygroup
sudo groupdel mygroup

w - Show who is logged on and what they are doing.

chsh - Change login shell.
```
chsh -s /bin/bash username
```

Conclusion

With these 50 additional Linux commands and examples, you can expand your knowledge and enhance your proficiency in managing and working with Linux systems. These commands cover a wide range of tasks, from text processing and file manipulation to network diagnostics and system administration. Continue to explore and experiment with these commands to become a more skilled Linux user.

Introduction#

Conclusion#

Introduction

Conclusion