Import macOS userland

adv_cmds-176
basic_cmds-55
bootstrap_cmds-116.100.1
developer_cmds-66
diskdev_cmds-667.40.1
doc_cmds-53.60.1
file_cmds-321.40.3
mail_cmds-35
misc_cmds-34
network_cmds-606.40.1
patch_cmds-17
remote_cmds-63
shell_cmds-216.60.1
system_cmds-880.60.2
text_cmds-106

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diff --git a/system_cmds/chkpasswd.tproj/chkpasswd.8 b/system_cmds/chkpasswd.tproj/chkpasswd.8
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+.Dd July 20, 2004
+.Dt CHKPASSWD 8
+.Os Darwin
+.Sh NAME
+.Nm chkpasswd
+.Nd verifies user password against various systems
+.Sh SYNOPSIS
+.Nm chkpasswd
+.Op Fl i Ar infosystem Op Fl l Ar location
+.Op Fl c
+.Op Ar name
+.Sh DESCRIPTION
+.Nm chkpasswd
+verifies a supplied username and password against file, NIS,
+or OpenDirectory infosystems.
+.Pp
+The options are as follows:
+.Bl -tag -width Ds
+.\" ==========
+.It Fl c
+The supplied password is compared verbatim without first being encrypted.
+.\" ==========
+.It Fl i Ar infosystem
+Specify the system against which to check the password
+(default is PAM). Valid systems:
+.Bl -tag -width "opendirectory"
+.It Ar file
+File-based passwords
+.It Ar nis
+NIS/YP authentication
+.It Ar opendirectory
+OpenDirectory (Directory Services) authentication.
+If no
+.Fl l
+option is specified, the search node is used.
+.It Ar PAM
+Pluggable Authentication Modules
+.El
+.Pp
+.\" ==========
+.It Fl l Ar location
+Specify a location; varies based on infosystem type:
+.Bl -tag -width "for opendirectory"
+.It for file
+Filename (default: /etc/master.passwd).
+.It for nis
+NIS domainname.
+.It for opendirectory
+A directory node name such as /Local/Default.
+.It for PAM
+Unused.
+.El
+.Pp
+.El
+.Ar name
+username
+.Sh SEE ALSO
+.Xr dscl 1 ,
+.Xr passwd 5