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

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