Linux Shell Script - Special Variables #008 #shorts

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There are special parameters that allow accessing all the command-line arguments at once. Both the parameters specify the command-line arguments.

$0 - The filename of the current script.
$# - The number of arguments supplied to a script.
$* - All the arguments are double quoted. If a script receives two arguments, $* is equivalent to $1 $2.
$@ - All the arguments are individually double quoted. If a script receives two arguments, $@ is equivalent to $1 $2.
$? - The exit status of the last command executed.
$$ - The process number of the current shell. For shell scripts, this is the process ID under which they are executing.

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