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/usr/lib/tiger/util/setsh is in tiger 1:3.2.3-10.

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#!/bin/sh
#
# Convert everything over to another shell.
#
# This of course only useful for converting to Bourne Shell-line
# shells such as Korn Shell or Bourne Again SHell.  Can also
# be used to add options to the scripts.
#
# Usage: setsh path_to_shell shell_arguments
#
#    This program is free software; you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation; either version 2, or (at your option)
#    any later version.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.


shell=$1
shellx="$*"

[ ! -n "$shell" ] && {
  echo "--ERROR-- Usage: $0 shellname"
  exit 1
}

[ ! -x $shell ] && {
  echo "--ERROR-- $shell does not exist or not executable"
  exit 1
}

case $shell in
  *csh)
     echo "--ERROR-- C-shell style shells are not acceptable"
     exit 1
     ;;
  *zsh)
     echo "--ERROR-- zsh is not acceptable"
     exit 1
     ;;
esac
   
findcmd()
{
  CMD=$1

  SRCH=/usr/ucb:/usr/bin:/bin:/etc:/usr/etc
  
  SAVEIFS=$IFS
  IFS=:
  set $SRCH
  IFS=$SAVEIFS
  for dir
  do
    [ -x $dir/$CMD ] && {
      echo $dir/$CMD
      return
    }
  done
}

FIND=`findcmd find`
ED=`findcmd ed`

$FIND . ! -type d -print |
while read filename
do
  $ED -s $filename <<EDCMD
1,1s%#!.*\$%#!$shellx%
w
q
EDCMD
done