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id use to print real and effective user and group IDs


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

  -a             ignore, for compatibility with other versions
  -Z, --context  print only the security context of the current user
  -g, --group    print only the effective group ID
  -G, --groups   print all group IDs
  -n, --name     print a name instead of a number, for -ugG
  -r, --real     print the real ID instead of the effective ID, with -ugG
  -u, --user     print only the effective user ID
  -z, --zero     delimit entries with NUL characters, not whitespace;
                   not permitted in default format
      --help     display this help and exit
      --version  output version information and exit

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

GNU coreutils online help: <>
For complete documentation, run: info coreutils 'id invocation'


# id root
uid=0(root) gid=0(root) groups=0(root)
# id xiexianbin
uid=1000(xiexianbin) gid=1000(xiexianbin) groups=1000(xiexianbin),1002(xie)
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