Linux $@ 在 shell 脚本中是什么意思

$@与$*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(从而在另一个程序周围形成一个包装器).

当你有一个带空格的论点(例如)并用双引号加$@时，这两种语法之间的差异就会显现出来:

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"

将导致:

"$@": wrappedProgram "one two    three" four five "six seven"
"$*": 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