Shell commands such as pwd, test, echo, continue, type. Shell keywords such as if.else, do.while. /etc/profile is the system-wide user login script which runs whenever a user logs into the system. Linux users involved with system administration and troubleshooting often work with the shell scripts. Scripts are useful for automating the processes repeatedly at the command line. Shell scripts are a fundamental part of the UNIX and Linux programming environment. A shell script is series of commands stored in a plain text file. TCSH – It is an enhanced but completely compatible version of the Berkeley UNIX C shell (CSH). The Korn Shell also was the base for the POSIX Shell standard specifications. KSH (Korn SHell) – Created by David Korn at AT & T Bell Labs. CSH (C SHell) – The C shell’s syntax and usage are very similar to the C programming language. BASH (Bourne-Again SHell) – Most common shell in Linux. The various shells available for Linux are: The shell is not a part of system kernel, but it uses the system to execute programs. We can start using the shell by opening the console(terminal). In other forms, it is a user program or it is an environment provided for user interaction. There are also a whole bunch of other options, for example setopt SHARE_HISTORY, which shares history between all sessions, and setopt APPEND_HISTORY which appends rather than overwrites.The Shell is a command line interpreter that executes commands read from the standard input device such as keyboard or from a file. HISTSIZE indicates how many lines of history to keep in memory and SAVEHIST how many lines to keep in the history file. zsh_history, is created in the users home directory. 
To make zsh save its history to a file when it exits, a variable needs to be set in the shell: HISTFILE=$/.zsh_history The history is lost when a terminal window is closed. By default, zsh does not save its history when the shell exits. It’s handy to be able to remember previously executed commands. zshrc? Well, you might have to do some research here, because shells like zsh generally provide a lot of options.įirst thing, download a better terminal, such as ITerm2.
It’s a place where you can set parameters like $PATH, $PROMPT, and aliases. zlogoutīut do you need them all? Not really. zlogout – Cleaning up things when the shell exits. zshrc – Sets the environment for interactive shells.
zlogin – Sets the environment for the login shells, just get loaded at different times. Every time you open up a new terminal window, potentially all configuration files will be run. The shell has a bunch of files it executes at startup, some in the users home directory.
Here are some of the basics for setting things up. On Macs, the default shell is the zsh, or Z shell.
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