id
Maintenance Commands id(1M)NAME
id - return user identitySYNOPSIS
/usr/bin/id [ -p ] [ user ] /usr/bin/id -a [ -p ] [ user ] /usr/xpg4/bin/id [ -p ] [ user ] /usr/xpg4/bin/id -G [ -n ] [ user ] /usr/xpg4/bin/id -g [ -nr ] [ user ] /usr/xpg4/bin/id -u [ -nr ] [ user ]DESCRIPTION
If no user operand is provided, the id utility writes the user and group IDs and the corresponding user and group names of the invoking process to standard output. If the effective and real IDs do not match, both are written. If multiple groups are supported by the underlying system, /usr/xpg4/bin/id also writes the supplementary group affili- ations of the invoking process. If a user operand is provided and the process has the appropriate privileges, the user and group IDs of the selected user are written. In this case, effective IDs are assumed to be identical to real IDs. If the selected user has more than one allowable group membership listed in the group database, /usr/xpg4/bin/id writes them in the same manner as the supplementary groups described in the preced- ing paragraph. Formats The following formats are used when the LC_MESSAGES locale category specifies the "C" locale. In other locales, the strings uid, gid, euid, egid, and groups may be replaced with more appropriate strings corresponding to the locale. "uid=%u(%s) gid=%u(%s)\n" <real user ID>, <user-name>, <real group ID>, <group-name> If the effective and real user IDs do not match, the follow- ing are inserted immediately before the \n character in the previous format: " euid=%u(%s)" SunOS 5.8 Last change: 24 Jan 2000 1 Maintenance Commands id(1M) with the following arguments added at the end of the argu- ment list: <effective user ID>, <effective user-name> If the effective and real group IDs do not match, the fol- lowing is inserted directly before the \n character in the format string (and after any addition resulting from the effective and real user IDs not matching): " egid=%u(%s)" with the following arguments added at the end of the argu- ment list: <effectivegroup-ID>, <effectivegroupname> If the process has supplementary group affiliations or the selected user is allowed to belong to multiple groups, the first is added directly before the <NEWLINE> character in the format string: " groups=%u(%s)" with the following arguments added at the end of the argu- ment list: <supplementary group ID>, <supplementary group name> and the necessary number of the following added after that for any remaining supplementary group IDs: ",%u(%s)" and the necessary number of the following arguments added at the end of the argument list: <supplementary group ID>, <supplementary group name> If any of the user ID, group ID, effective user ID, effec- tive group ID or supplementary/multiple group IDs cannot be mapped by the system into printable user or group names, the corresponding (%s) and name argument is omitted from the corresponding format string. SunOS 5.8 Last change: 24 Jan 2000 2 Maintenance Commands id(1M) When any of the options are specified, the output format is as described under OPTIONS.OPTIONS
The following option is supported by both /usr/bin/id and /usr/xpg4/bin/id. For /usr/xpg4/bin/id, -p is invalid if specified with any of the -G, -g, or -u options. -p Reports additionally the current project member- ship of the invoking process. The project is reported using the format: "projid=%u(%s)" which is inserted prior to the 0haracter of the default format described in the Formats section. The arguments <project ID>,<project name> are appended to the end of the argument list. If the project ID cannot be mapped by the system into a printable project name, the corresponding (%s) and name argument is omitted from the corresponding format string. /usr/bin/id The following option is supported for /usr/bin/id only: - a Reports user name, user ID and all the groups to which the user belongs. /usr/xpg4/bin/id The following options are supported for /usr/xpg4/bin/id only: - G Output all different group IDs (effective, real and supplementary) only, using the format "%u\n". If there is more than one distinct group affiliation, output each such affiliation, using the format " %u", before the <NEWLINE> character is output. -g Output only the effective group ID, using the format "%u\n". -n Output the name in the format "%s" instead of the numeric ID using the format "%u". -r Output the real ID instead of the effective ID. -u Output only the effective user ID, using the format SunOS 5.8 Last change: 24 Jan 2000 3 Maintenance Commands id(1M) "%u\n".OPERANDS
The following operand is supported: user The user (login) name for which information is to be written. ENVIRONMENT VARIABLES See environ(5) for descriptions of the following environment variables that affect the execution of id: LC_CTYPE, LC_MESSAGES, and NLSPATH. EXIT STATUS The following exit values are returned: 0 Successful completion. >0 An error occurred.ATTRIBUTES
See attributes(5) for descriptions of the following attri- butes: /usr/bin/id ____________________________________________________________ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | |_____________________________|_____________________________| | Availability | SUNWcsu | |_____________________________|_____________________________| | | SUNWcar | |_____________________________|_____________________________| /usr/xpg4/bin/id ____________________________________________________________ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | |_____________________________|_____________________________| | Availability | SUNWxcu4 | |_____________________________|_____________________________|SEE ALSO
fold(1), logname(1), who(1), getgid(2), getgroups(2), get- projid(2), getuid(2), attributes(5), environ(5), XPG4(5)NOTES
Output produced by the -G option and by the default case could potentially produce very long lines on systems that support large numbers of supplementary groups. SunOS 5.8 Last change: 24 Jan 2000 4