A shell script is a text file with a list of shell commands and it is executed like a program to perform a task or a set of tasks. The primary aim of a shell script is to automate tasks and save time. It is important to understand basic structure of a shell script, since it is you interact with a computing clusters via shell scripts See next chapter on Grid Engine. There are many different shells available in Unix-like systems. It has some advantages to other shells and is pretty much the standard shell, and we will show how to use it for scripting below. We will save the text file as myScript.
UNIX & Linux Shell Scripting (Reading, Writing Files)
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Most Unix system commands take input from your terminal and send the resulting output back to your terminal. A command normally reads its input from the standard input, which happens to be your terminal by default. Similarly, a command normally writes its output to standard output, which is again your terminal by default.