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       checkpw - checks password against the file ~/Maildir/.password


       checkpw prog


       checkpw  reads  descriptor  3  through  end  of  file  and  then closes
       descriptor 3.  There must be at most 512 bytes of data  before  end  of

       The  information supplied on descriptor 3 is a login name terminated by
       \0, a password terminated by \0, a  timestamp  terminated  by  \0,  and
       possibly more data.  There are no other restrictions on the form of the
       login name, password, and timestamp.

       If the password is  unacceptable,  checkpw  exits  1.   If  checkpw  is
       misused,  it  may  instead  exit  2.   If  there is a temporary problem
       checking the password, checkpw exits 111.

       If the password is acceptable, checkpw runs prog.

       prog consists of one or more arguments.

Compatible tools

       There are other tools that offer the same interface as checkpw

       Note that these tools do not follow  the  getopt  interface.   Optional
       features  are  controlled through (1) the tool name and (2) environment

The password database

       checkpw  checks  the  password  against  the  content   of   the   file
       Maildir/.password  in  the  user’s  home directory corresponding to the
       login name.

       Maildir may be overidden through the environment variable $MAILDIR.

Process-state changes

       Before invoking  prog,  checkpw  sets  up  $USER,  $HOME,  $SHELL,  its
       supplementary groups, its gid, its uid, and its working directory.




       checkapoppw(8), qmail-popup(8), qmail-pop3d(8)


       This manual page was written by Gerrit Pape <>, for the
       Debian GNU/Linux system.