mdw@git.distorted.org.uk Git - shells/blob - ushell.1

   1 .\" -*-nroff-*-
   2 .TH ushell 1 "20 April 1999" "Local tools"
   3 .SH NAME
   4 ushell \- display a user's shell
   5 .SH SYNOPSIS
   6 .B ushell
   7 .I user
   8 .SH USAGE
   9 Writes the named user's default shell to standard output.  This is
  10 useful in scripts sometimes.  In particular, it's handy in global
  11 .B xdm/Xstartup
  12 scripts for checking whether users have sensible shells:
  13 .sp 1
  14 .RS 5
  15 .nf
  16 .ft B
  17 SHELL=`ushell $USER`
  18 case $SHELL in
  19   */banned)
  20     xmessage -file $HOME/.banned
  21     exit 1
  22     ;;
  23   *)
  24     if ! grep -q "^$SHELL" /etc/shells; then
  25       xmessage "You're not allowed to log in this way."
  26       exit 1
  27     fi
  28     ;;
  29 esac
  30 .fi
  31 .ft R
  32 .SH BUGS
  33 None planned.
  34 .SH SEE ALSO
  35 .BR banned (8),
  36 .BR chrootsh (8).
  37 .SH AUTHOR
  38 Mark Wooding (mdw@nsict.org)