A shell is a program that runs operating system commands.Using a conventional desktop, the user selects an item with the mouse and then applies an action to it,such as highlighting an icon and choosing to copy it.In a shell,the person types instructions (or actions) followed by the targets and any special options.This counterintuitive interface can confuse new users who are used to conventional desktops.

Linux_Shell_Scripting_With_Bash.pdf

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