Linux Basics/Terminals, command prompt, alias, history

What's a terminal? Terminal = command prompt → shell = command-line interpreter Text-mode, DOS-like There are several terminals Gnome-terminal, Xfce4-terminal, xterm, etc. There are many shells (e.g. bash, fish, ksh, zsh etc.) you can also customize the shells, for example this video on YouTube shows it: [GNOME 3.28] PowerLevel9k -  The Most Cool Linux Shell EVER! commands can be executed command list: https://ss64.com/bash/ (and also the Linux Basics/Basic commands chapter) alias: we can shorten a complex command with an alias or we can create our own one. Location of definition (in case of bash shell): ~/.bashrc Global aliases: /etc/bashrc History It can be recalled by pressing up and down arrows on keyboard you can switch tabs on terminal by pressing ctrl+page up or ctrl+page down ~/.bash_history shows the commands before login Environment variables Environment variables: it stores information of the operating system or programs. Environment variables get set automatically after startup. For example, PATH environment variable tells the shell where to search the executable files. Printing them to terminal: printenv, set but particular environment variables can be displayed too: printenv PATH to set up an environment variable: set VAR1=”something” where VAR1 is an arbitrary variable to delete an environment variable: unset var1 displaying a particular one(same as printenv basically): echo $VAR1 to have the setting in the system permanently: export VAR1=”valami” we can create an own command under /home/bin folder, but it works only if we added the folder to PATH environment variable: export PATH=$PATH:~/bin, and to make it permanent in .bashrc:echo "export PATH=$PATH:~/bin" >> ~/.bashrc Thottee explained it on his website in more detail that what we do exactly (his website is in hungarian so you may need to translate it with a translator program: http://linuxkezdoknek.hu/articles.php?article_id=33 (the article's second half) Help thumb|top in man help under Sparky Linux help for using a command: help command for the manual (detailed help): man, info usage: man <switches> <command> info <switches> <command>