Steps to write and execute a script
Python is an interpreter language. It means it executes the code line by line. Python provides a Python Shell, which is used to execute a single Python command and display the result.
Python comes preinstalled on most Linux distributions, and is available as a package on all others. However there are certain features you might want to use that are not available on your distro's package. You can easily compile the latest version of Python from source.
Python can be a simple link in the chain. Python should not replace all the bash commands. It is as powerful to write Python programs that behave in a UNIX fashion (that is, read in standard input and write to standard output) as it is to write Python replacements for existing shell commands, such as cat and sort.
Some guidelines: If you're mostly calling other utilities and are doing relatively little data manipulation, shell is an acceptable choice for the task. If performance matters, use something other than shell. If you find you need to use arrays for anything more than assignment of ${PIPESTATUS} , you should use Python.
Python
As other answers have already stated, it's not a compulsion to know Linux before learning to code in Python. ... So, pretty much, yeah you should better start coding in Python on Linux.
While it is true that bash might be faster than python for some select tasks, it can never be as quick to develop with, or as easy to maintain (at least after you get past 10 lines of code or so). Bash's sole strong point wrt python or ruby or lua, etc., is its ubiquity.
Bash programming is very simple. You should be learning languages like C and so forth; shell programming is rather trivial compared to these. Although, it is important to learn. If you haven't taken Operating Systems, then surely you will as part of your degree, if your program is worth its salt.
Bash ( bash ) is one of many available (yet the most commonly used) Unix shells. Bash stands for "Bourne Again SHell", and is a replacement/improvement of the original Bourne shell ( sh ). Shell scripting is scripting in any shell, whereas Bash scripting is scripting specifically for Bash.
Bash is a command processor that typically runs in a text window where the user types commands that cause actions. Bash can also read and execute commands from a file, called a shell script.
How to Write a Basic Shell Script
Stick Notes. Shell Scripting is the language of the linux terminal. Shell scripts are sometimes referred to as “shebang” which is derived from the “#!” notation. Shell scripts are executed by interpreters present in the linux kernel.
Use the following Linux or Unix commands:
To change your shell with chsh:
Update your Terminal preferences to open the shell with the command /bin/bash , as shown in the screenshot above. Quit and restart Terminal. You should see "hello from bash", but if you run echo $SHELL , you will see /bin/zsh .
How to Change my default shell
The Bourne shell (sh), written by Steve Bourne at AT&T Bell Labs, is the original UNIX shell. It is the preferred shell for shell programming because of its compactness and speed.
command chmod
Switch back by following the steps below!
To check for Bash on your computer, you can type “bash” into your open terminal, like shown below, and hit the enter key. Note that you will only get a message back if the command is not successful. If the command is successful, you will simply see a new line prompt waiting for more input.
Bash
There are many different unix shells. Ubuntu's default shell is Bash (like most other Linux distributions). ... Pretty much any Unix-like system has a Bourne-style shell installed as /bin/sh , usually ash, ksh or bash. On Ubuntu, /bin/sh is Dash, an ash variant (chosen because it is faster and uses less memory than bash).
To find the current shell instance, look for the process (shell) having the PID of the current shell instance. Show activity on this post. $SHELL gives you the default shell. $0 gives you the current shell.
whoami command is used both in Unix Operating System and as well as in Windows Operating System. It is basically the concatenation of the strings “who”,”am”,”i” as whoami. It displays the username of the current user when this command is invoked. It is similar as running the id command with the options -un.