我在Mac OS X上用bash完成文件夹检查ls -l输出
$ls -alrth /usr/local/etc/bash_completion.d/docker-machine* -rw-r--r--@ 1 abhimskywalker staff 1.4K Jun 13 19:04 /usr/local/etc/bash_completion.d/docker-machine-prompt.bash -rw-r--r--@ 1 abhimskywalker staff 1.5K Jun 13 19:36 /usr/local/etc/bash_completion.d/docker-machine-wrapper.bash -rw-r--r--@ 1 abhimskywalker staff 6.8K Jun 13 19:37 /usr/local/etc/bash_completion.d/docker-machine.bash
我无法理解这个@在-rw-r – r – @中是什么意思？
它表示该文件具有
extended attributes.您可以使用xattr命令行实用程序来查看和修改它们：
xattr -l file # lists the names of all xattrs. xattr -w attr_name attr_value file # sets xattr attr_name to attr_value. xattr -d attr_name file # deletes xattr attr_name. xattr -c file # deletes all xattrs. xattr -h # prints help
您还可以使用ls -l @查看有关这些扩展属性的更多信息.
从osx ls手册页：
The Long Format
If the file or directory has extended attributes,the permissions field printed by the -l option is followed by an @ character. Otherwise,if the file or directory has extended security information,the permissions field printed by the -l option is followed by a + character.
和
-@ Display extended attribute keys and sizes in long (-l) output.
