8.2. Programming with the Bourne Shell
8.2.1. The Steps in Creating a Shell Script
A shell script is normally written in an editor and consists of commands interspersed with comments. Comments are preceded by a pound sign and consist of text used to document what is going on.
The First Line. The first line at the top left corner of the script will indicate the program that will be executing the lines in the script. This line is commonly written as
#!/bin/sh
The #! is called a magic number and is used by the kernel to identify the program that should be interpreting the lines in the script. This line must be the top line of your script.
Comments. Comments are lines preceded by a pound sign (#) and can be on a line by themselves or on a line ...
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