Unix Bash "$*" 和 "$@"的含义

时间：2010-06-28 来源：meteorm

$*
All of the positional parameters, seen as a single word
$@
Same as $*, but each parameter is a quoted string, that is, the parameters are passed on intact, without
interpretation or expansion. This means, among other things, that each parameter in the argument list
is seen as a separate word.

Example. arglist: Listing arguments with $* and $@ #!/bin/bash
# Invoke this script with several arguments, such as "one two three".
E_BADARGS=65
if [ ! ?n "$1" ]
then
echo "Usage: `basename $0` argument1 argument2 etc."
exit $E_BADARGS
fi
echo
index=1
echo "Listing args with \"\$*\":"
for arg in "$*" # Doesn't work properly if "$*" isn't quoted.
do
echo "Arg #$index = $arg"
let "index+=1"
done # $* sees all arguments as single word.
echo "Entire arg list seen as single word."
echo
index=1
echo "Listing args with \"\$@\":"
for arg in "$@"
do echo "Arg #$index = $arg"
let "index+=1"
done # $@ sees arguments as separate words.
echo "Arg list seen as separate words."
echo
exit 0

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