List:

• list installed
  • get all installed packages apt list --installed
  • check if package is installed apt list --installed <APPLICATION_NAME>
  • get installed version apt-get policy <APPLICATION_NAME>
• search candidate
  • search a package apt-cache search "<PACKAGE_PARTIAL_NAME>*"
• install
  • fetch all updates apt-get update
  • install: sudo apt-get install <APPLICATION_NAME>
• upgrade
  • fetch all updates apt-get update
  • install them apt-get upgrade
• remove
  • • application : apt-get remove <APPLICATION_NAME>
    • application and configuration files: apt-get remove <APPLICATION_NAME>

List:

• get PPA description
• list local ppa: ls -l /etc/apt/sources.list.d/
• add (update afterwards): sudo add-apt-repository ppa:<USER_NAME>:<PACKAGE_NAME>
• add public key (message The following signatures couldn't be verified because the public key is not available <KEY> : sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys <KEY>
• remove ppa:
  • command-line: sudo add-apt-repository --remove ppa:PPA_Name/ppa

Aptitude sudo apt-get install aptitude

Use synaptic sudo apt-get synaptic

API

List:

• refresh cache: apk update
• install: apk add PACKAGE_NAME

bash-5.0# apk add llvm-toolset-7
ERROR: unsatisfiable constraints:
  llvm-toolset-7 (missing):
    required by: world[llvm-toolset-7]

Make package less dependent on linux distributions. All installed bin in /snap/bin

sudo apt install snapd

Run a GUI: nohup snap run &

Without backing up data

sudo snap remove --purge $PACKAGE

List task.

sudo snap changes

It will give you back a list.

ID   Status   Spawn                Ready                Summary
377  Done     today at 09:28 CEST  today at 09:28 CEST  Auto-refresh snaps "code", "glab"
378  Undoing  today at 10:47 CEST  -                    Remove "docker" snap
379  Done     today at 10:55 CEST  today at 10:55 CEST  Refresh all snaps: no updates

To stop "Remove docker app", use `abort`.

sudo snap abort 378

sudo snap set system proxy.http=$PROXY sudo snap set system proxy.https=$PROXY

SDK installer for - Java - Maven - Gradle

SDKman is using `curl` under the hood.

Steps :

• check API is reachable (or [setup](https://github.com/GradedJestRisk/linux-training/wiki/curl#proxy) ) `curl https://api.sdkman.io/2/candidates/all`
• bootstrap install curl -s "https://get.sdkman.io" | bash
• get new environment source "/home/<USER>/.sdkman/bin/sdkman-init.sh"
• check version sdk version
• configure bash & zsh (consider using plugins)

If you've got `INTERNET NOT REACHABLE!`, - check proxy (see above); - configure timeouts using curl guidelines

sdkman_curl_connect_timeout=5
sdkman_curl_continue=true
sdkman_curl_max_time=10

Source

Configuration file is ~/.sdkman/etc/config

# Activate hook to load .sdkmanrc when you enter a directory
sdkman_auto_env=true

Help sdk help

Overview:

• check available versions sdk list <SDK_NAME>
• install:
  • latest version sdk install <SDK_NAME>
  • previous version sdk install <SDK_NAME> <VERSION_NUMBER>
  • specific version, eg openJDK 16 for java sdk install java 16.0.1.j9-adpt
• switch (between installed) version:
  • for this shell instance only sdk use <SDK_NAME> <VERSION_NUMBER>
  • for next shell instances sdk default <SDK_NAME> <VERSION_NUMBER>
• show version used sdk current <SDK_NAME>
• check for upgrade sdk upgrade <SDK_NAME>
• remove sdk remove <SDK_NAME>

Upgrade modes:

• Long-Term Support (LTS)
• normal

List & change upgrade mode:

• CLI : vi /etc/update-manager/release-upgrades
• GUI: run software-properties-gtk (Software & update, update tab

• CLI: do-release-upgrade
• GUI