Linux Server Command Pallette🌸:
| command | description |
reference |
|---|---|---|
| uname -a | Show system information via uname command |
$ uname -r (system information) $ uname -s (kernel release) $ uname -m (architecture) $ uname -o (operating system) |
| uptime | Display how long the system has been running, including load average |
$ uptime |
| hostname | See system hostname |
$ hostname $ hostname -i (Show the IP address of the system) |
| last reboot | List system reboot history |
$ last reboot |
| scp | Copy a file to a server directory securely |
$ scp [file_name.txt] [server/tmp] |
| ulimit | View or limit system resource amounts |
$ ulimit [flags] [limit] |
| last | Show last system logins: |
$ last |
| who | Display who is currently logged into the system |
$ who |
| w | Show which users are logged in and their activity |
$ w |
| pstree | Process in a tree like diagram |
$ pstree |
| pmap | Display a memory usage map of processes |
$ pmap |
| pidof | Gives the Process ID (PID) of a process |
$ pidof |
| nice | Starts a process with a given priority |
$ nice |
| renice | Changes priority of an already running process |
$ renice |
| sudo passwd -l 'username' | To change the password of a user |
$ sudo passwd -l 'username' |
| sudo userdel -r 'username' | To remove a newly created user |
$ sudo userdel -r 'username' |
| sudo usermod -a -G GROUPNAME USERNAME | To add a user to a group |
$ sudo usermod -a -G GROUPNAME USERNAME |
| dmesg | Display messages in kernel ring buffer |
$ dmesg |
| cat /proc/cpuinfo | Display CPU information |
$ cat /proc/cpuinfo |
| cat /proc/meminfo | Display memory information |
$ cat /proc/meminfo |
| mpstat 1 / vmstat 1 / iostat 1 | Display processor, virtual memory and I/O related statistics |
- |
| tcpdump -i eth0 | Capture and display all packets on interface eth0 |
$ tcpdump -i eth0 |
| tcpdump -i eth0 'port 80' | Monitor all traffic on port 80 ( HTTP ) |
$ tcpdump -i eth0 'port 80' |
| lsof | List all open files on the system |
$ lsof -u user (List files opened by user) |
| last | Display the last users who have logged onto the system. |
$ last |
| netstat -pnltu | See active (listening) ports with the netstat command |
$ netstat -pnltu |
| netstat -nutlp | Show tcp and udp ports and their programs |
$ netstat -nutlp |
| dig [domain] | Show DNS information about a domain using the dig command |
$ dig [domain] |
| dig -x [ip_address] | Do reverse lookup of an IP address |
$ dig -x [ip_address] |
| lastlog | The lastlog command is used to find the details of a recent login of all users or of a given user. |
$ lastlog |
| rsync | Synchronize /home to /backups/home |
$ rsync -a /home /backups/ |
| visudo | Edit the sudoers configuration file. |
$ visudo |
| sudo -i | Switch to the root account with root's environment. (Login shell.) |
$ sudo -i |
| sudo -s | Execute your current shell as root. (Non-login shell.) |
$ sudo -s |
| sudo -l | List sudo privileges for the current user. |
$ sudo -l |
| sar | check server memory and swap usage. |
$ sar |