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Программа выводит всех пользователей в системе

LSLOGINS(1)                                                   User Commands                                                  LSLOGINS(1)

       lslogins - display information about known users in the system

       lslogins [options] [-s|-u[=UID]] [-g groups] [-l logins] [username]

       Examine the wtmp and btmp logs, /etc/shadow (if necessary) and /etc/passwd and output the desired data.

       The  optional  argument  username  forces lslogins to print all available details about the specified user only. In this case the
       output format is different than in case of -l or -g and unknown is username reported as an error.

       The default action is to list info about all the users in the system.

       Mandatory arguments to long options are mandatory for short options too.

       -a, --acc-expiration
              Display data about the date of last password change and the  account  expiration  date  (see  shadow(5)  for  more  info).
              (Requires root privileges.)

       --btmp-file path
              Alternate path for btmp.

       -c, --colon-separate
              Separate info about each user with a colon instead of a newline.

       -e, --export
              Output data in the format of NAME=VALUE.

       -f, --failed
              Display data about the users' last failed login attempts.

       -G, --supp-groups
              Show information about supplementary groups.

       -g, --groups=groups
              Only  show  data  of users belonging to groups.  More than one group may be specified; the list has to be comma-separated.
              The unknown group names are ignored.

              Note that relation between user and group may be invisible for primary group if the user  is  not  explicitly  specify  as
              group  member  (e.g.  in /etc/group). If the command lslogins scans for groups than it uses groups database only, and user
              database with primary GID is not used at all.

       -h, --help
              Display help information and exit.

       -L, --last
              Display data containing information about the users' last login sessions.

       -l, --logins=logins
              Only show data of users with a login specified in logins (user names or user IDS).  More than one login may be  specified;
              the list has to be comma-separated.  The unknown login names are ignored.

       -n, --newline
              Display each piece of information on a separate line.

              Do not print a header line.

              Don't truncate output.

       -o, --output list
              Specify  which  output  columns  to print.  The default list of columns may be extended if list is specified in the format

              Output all available columns.  --help to get a list of all supported columns.

       -p, --pwd
              Display information related to login by password (see also -afL).

       -r, --raw
              Raw output (no columnation).

       -s, --system-accs
              Show system accounts.  These are by default all accounts with a UID below 1000  (non-inclusive),  with  the  exception  of
              either  nobody  or  nfsnobody  (UID  65534).   This  hardcoded  default  maybe  overwritten  by parameters SYS_UID_MIN and
              SYS_UID_MAX in the file /etc/login.defs.

       --time-format type
              Display dates in short, full or iso format.  The default is short, this time format is designed to be space efficient  and
              human readable.

       -u, --user-accs
              Show  user  accounts.   These  are  by  default all accounts with UID above 1000 (inclusive), with the exception of either
              nobody or nfsnobody (UID 65534).  This hardcoded default maybe overwritten by parameters UID_MIN and UID_MAX in  the  file

       -V, --version
              Display version information and exit.

       --wtmp-file path
              Alternate path for wtmp.

       -Z, --context
              Display the users' security context.

       -z, --print0
              Delimit user entries with a nul character, instead of a newline.

       The default UID thresholds are read from /etc/login.defs.

       0      if OK,

       1      if incorrect arguments specified,