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What is mean by Perl and shell scripting?

perl is the scripting language mainly used for Test Automation.

Shell is UNIX scripting language used to automate the frequently required things.

Perl is a high-level, general-purpose, interpreted, dynamic programming language

A shell script is a script written for the shell, or command line interpreter, of an operating system. It is often considered a simple domain-specific programming language. Typical operations performed by shell scripts include file manipulation, program execution, and printing text.

writing a shell script is much quicker than writing the equivalent code in other programming languages. The many advantages include easy program or file selection, quick start, and interactive debugging. A shell script can be used to provide a sequencing and decision-making linkage around existing programs, and for moderately-sized scripts the absence of a compilation step is an advantage.