(作者)

2011-11-26 01:05

3

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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