/bin
This directory contains executable programs which are needed in single user mode and to bring the sys‐ tem up or repair it.
此目录包含单用户模式下所需的可执行程序，并可以启动或修复系统。
/sbin
Like /bin, this directory holds commands needed to boot the system, but which are usually not executed by normal users.
与/ bin一样，此目录包含引导系统所需的命令，但通常不由普通用户执行。
/usr/bin
This is the primary directory for executable programs. Most programs executed by normal users which are not needed for booting or for repairing the system and which are not installed locally should be placed in this directory.
这是可执行程序的主目录。 普通用户执行的大多数程序（不需要用于引导或修复系统以及未在本地安装）都应放在此目录中。
/usr/sbin
This directory contains program binaries for system administration which are not essential for the boot process, for mounting /usr, or for system repair.
此目录包含用于系统管理的程序二进制文件，这些程序二进制文件对于引导过程，安装/ usr或系统修复不是必需的。
/usr/local/bin
Binaries for programs local to the site.
本地程序的二进制文件。
/usr/local/sbin
Locally installed programs for system administration.
本地安装的系统管理程序。