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→Using Variables in Shell Scripts
A '''positional parameter''' is a variable within a shell program; its value is set from an argument specified<br>on the command line that invokes the program.
Positional parameters are numbered and are referred to<br>with a preceding "'''$'''": '''$1''', '''$2''', '''$3''', and so on. The positional parameter $0 refers to either the name of shell <br>where command was issued, or name of shell script being executed.
There are a few ways to assign values as positional parameters:
