$@与几乎相同$*，均表示“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（从而形成对该另一个程序的包装）。当您的参数中带有空格（例如）并$@用双引号引起来时，两种语法之间的差异就会显现出来：wrappedProgram "$@"# ^^^ 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 $*# ^^^ this will join all arguments by single spaces as well and# will then split the string as the shell does on the command# line, thus it will split an argument containing spaces into# several arguments.示例：呼叫wrapper "one two three" four five "six seven"将导致："$@": 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
$@在大多数情况下，使用纯手段“会尽最大努力伤害程序员”，因为在大多数情况下，这会导致单词分隔以及参数中的空格和其他字符出现问题。在（被猜测的）所有情况的99％中，要求将其括在"："$@"是可用于可靠地遍历参数的内容。for a in "$@"; do something_with "$a"; done