它们通常用于简单地将所有参数传递给另一个程序

[root@node1 shell]# ./my-script hi 11 33 嗨11 33 [root@node1

$@与$*几乎相同，都表示“所有命令行参数”。它们通常用于简单地将所有参数传递给另一个程序(从而形成了对其他程序的包装)。

这两种语法之间的差异体现在你有一个带空格的参数(例如)，并把$@放在双引号中:

wrappedProgram "$@"
# ^^^ this is correct and will hand over all arguments in the way
#     we received them, i. e. as several arguments, each of them
#     containing all the spaces and other uglinesses they have.
wrappedProgram "$*"
# ^^^ this will hand over exactly one argument, containing all
#     original arguments, separated by single spaces.
wrappedProgram $*
# ^^^ this will join all arguments by single spaces as well and
#     will then split the string as the shell does on the command
#     line, thus it will split an argument containing spaces into
#     several arguments.

例如:打电话

wrapper "one two    three" four five "six seven"

会导致:

"$@": wrappedProgram "one two    three" four five "six seven"
"$*": wrappedProgram "one two    three four five six seven"
                             ^^^^ These spaces are part of the first
                                  argument and are not changed.
$*:   wrappedProgram one two three four five six seven

$@是传递给脚本的所有参数。

例如，如果你调用。/ somcript .sh foo bar，那么$@将等于foo bar。

如果你有:

./someScript.sh foo bar

然后在somscript .sh引用中:

umbrella_corp_options "$@"

这将被传递给伞状的corp_options，每个单独的参数都用双引号括起来，允许从调用者那里获取带有空格的参数并将它们传递出去。

它们通常用于简单地将所有参数传递给另一个程序

[root@node1 shell]# ./my-script hi 11 33 嗨11 33 [root@node1

摘自手册:

@ Expands to the positional parameters, starting from one. When the expansion occurs within double quotes, each parameter expands to a separate word. That is, "$@" is equivalent to "$1" "$2" .... If the double-quoted expansion occurs within a word, the expansion of the first parameter is joined with the beginning part of the original word, and the expansion of the last parameter is joined with the last part of the original word. When there are no positional parameters, "$@" and $@ expand to nothing (i.e., they are removed).

$@基本上用于引用shell-script的所有命令行参数。 $1， $2， $3是第一个命令行参数，第二个命令行参数，第三个参数。