L19 - T19D - S1 – Shell Scripts

The 3 general types of coding language

• Shell Scripting Language

• General Purpose Scripting Language

• Programming Language

Shell scripting language

Type of coding language

• Uses commands that are specific to an operating system.

General-purpose scripting language

Type of coding language

• Uses statements and modules that are independent of the operating system

• This type of script is executed by an interpreter

  • The interpreter implements the language for a particular OS

Programming Language

Type of coding language

• Used to compile an executable file that can be installed to an OS and run as an app

Glue Language

• Used to automate and orchestrate functions of multiple different OS and app software

  • Rather than implement an independent bit of software (as a programming language would)

• The various types of scripting are often described as [_____]s

Script

Series of simple or complex commands, parameters, variables, and other components stored in a text file and processed by a shell interpreter – (A+)

• For complex [____] and programming languages, an IDE would be of great use as it provides

  • Autocomplete features to help you write and edit code

  • Debugging tools to help identify whether the script or program is executing correctly

• Can be developed in any text editor

  • An editor with [____] support can parse the syntax of the [____] and highlight elements of it

.SH Extension

• Extension for a Linux shell script file format

• The shebang in the first line of the script identifies the shell type (Bash, for instance) – (A+)

  • Every shell script starts with a “shebang” line that designates which interpreter to use e.g. Bash or Ksh

• Permission

• Run

• In Linux, the script file must have the “execute” ___1___ set to ___2___

  • “Execute” can be set as a ___1___ for the user, group, or world (everyone)

• PATH

• Working

• If a ____ variable to the script has not been configured, execute it from the _____ directory by

  • Preceding the filename with ./ e.g. ./hello.sh or

  •  Use the full path