正确使用$ @ [英] Using $@ properly

问题描述

我正在尝试编写一个微型脚本，该脚本可以接受任意数量的命令行参数，这些参数可以打印出文件(而非目录)的 rwx 权限

I am trying to write a tiny script that accepts any number of command line arguments that prints out the rwx permissions for a file (not directory)

我拥有的是

file=$@    
if [ -f $file ] ; then    
ls -l $file    
fi

但是，它仅接受一个命令行参数.感谢您的帮助.

This accepts only one command line argument however. Thanks for any help.

推荐答案

此处演示了 $ * 和 $ @ 之间的一些区别，并带有和没有引号:

Here is a demonstration of the some of the differences between $* and $@, with and without quotes:

#/bin/bash
for i in $*; do
    echo "\$*: ..${i}.."
done; echo
for i in "$*"; do
    echo "\"\$*\": ..${i}.."
done; echo
for i in $@; do
    echo "\$@: ..${i}.."
done; echo
for i in "$@"; do
    echo "\"\$@\": ..${i}.."
done; echo

运行它:

user@host$ ./paramtest abc "space here"
$*: ..abc..
$*: ..space..
$*: ..here..

"$*": ..abc space here..

$@: ..abc..
$@: ..space..
$@: ..here..

"$@": ..abc..
"$@": ..space here..

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