The shell sets some environment variables according to the command line arguments specified

The shell sets some environment variables according to the command line arguments specified

























$0 The name the script was invoked with. This may be a basename
without directory component, or a path name. This variable
is not changed with subsequent shift
commands.
$1, $2, $3, … The first, second, third, … command line argument,
respectively. The argument may contain whitespace if the argument
was quoted, i.e. "two words".
$# Number of command line arguments, not counting the
invocation name $0
$@ "$@" is replaced with all command line
arguments, enclosed in quotes, i.e. "one", "two three",
"four". Whitespace within an argument is
preserved.
$* $* is replaced with all command line
arguments. Whitespace is not preserved, i.e.
"one", "two three", "four" would be changed to
"one", "two", "three", "four".

This variable is not used very often, "$@"
is the normal case, because it leaves the arguments
unchanged.

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