Checking kernel and packages 🐧

Linux Commands for Kernel and Packages

Summary

🐧 Echo the number of kernel versions that are stored on this system into /root/kernel

🐧 Check all the kernel information

💬Let's check the kernel and package info on the system 🐧 🐧 🐧

1. Display information about the currently running operation system

Input

uname -a

Example Output

 
ubuntu $ uname -a
Linux ubuntu 5.4.0-131-generic #147-Ubuntu SMP Fri Oct 14 17:07:22 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux

2. Check for old versions of the kernel that are on the system.

Input

ls /boot/vm*

Example Output

 
ubuntu $ ls /boot/vm*
/boot/vmlinuz  /boot/vmlinuz-5.4.0-131-generic  /boot/vmlinuz.old

3. Echo the number of version into /root/kernel

Input

echo 1 > /root/kernel

4. Next we will check how many packages are on the system.

Input

dpkg -l | wc -l

Example Output

 
ubuntu $ dpkg -l | wc -l
724

5. What is the version of ssh on this system? Server and client.

Input

dpkg -l | grep -i ssh

Example Output

 
ubuntu $ dpkg -l | grep -i ssh
ii  libssh-4:amd64                   0.9.3-2ubuntu2.2                  amd64        tiny C SSH library (OpenSSL flavor)
ii  openssh-client                   1:8.2p1-4ubuntu0.5                amd64        secure shell (SSH) client, for secure access to remote machines
ii  openssh-server                   1:8.2p1-4ubuntu0.5                amd64        secure shell (SSH) server, for secure access from remote machines
ii  openssh-sftp-server              1:8.2p1-4ubuntu0.5                amd64        secure shell (SSH) sftp server module, for SFTP access from remote machines
ii  ssh-import-id                    5.10-0ubuntu1                     all          securely retrieve an SSH public key and install it locally
ii  sshfs                            3.6.0+repack+really2.10-0ubuntu1  amd64        filesystem client based on SSH File Transfer Protocol

💬 client is named openssh-client

💬 server is named openssh-server

Next up: Checking disk and mount points