Linux id命令

id 命令可以显示真实有效的用户 ID(UID) 和组 ID(GID)。UID 是对一个用户的单一身份标识。组 ID（GID）则对应多个UID。

Usage: id [OPTION]... [USERNAME] Print user and group information for the specified USERNAME, or (when USERNAME omitted) for the current user.

-a ignore, for compatibility with other versions 忽略该命令,仅为了与其他版本兼容 -Z, --context print only the security context of the current user 仅输出当前用户的security context//id: --context (-Z) works only on an SELinux-enabled kernel -g, --group print only the effective group ID 显示用户所属群组的ID -G, --groups print all group IDs  显示用户所属附加群组的ID -n, --name print a name instead of a number, for -ugG 显示用户，所属群组或附加群组的名称 -r, --real print the real ID instead of the effective ID, with -ugG 显示实际ID -u, --user print only the effective user ID 显示用户ID --help display this help and exit   显示帮助 --version output version information and exit 显示版本信息

Without any OPTION, print some useful set of identified information.

Report id bugs to bug-coreutils@gnu.org GNU coreutils home page: <http://www.gnu.org/software/coreutils/> General help using GNU software: <http://www.gnu.org/gethelp/> Report id translation bugs to <http://translationproject.org/team/> For complete documentation, run: info coreutils 'id invocation'