9.2. Programming with the C Shell
9.2.1. 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. At the top left corner, the line preceded by #! (often called shbang) indicates the program that will be executing the lines in the script. This line is commonly
#!/bin/csh
The #!, also called a magic number, is used by the kernel to identify the program that should be interpreting the lines in the script. When a program is loaded into memory, the kernel will examine the first line. If the first line is binary data, the program will be executed as a compiled program; ...
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