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Here is a nice ksh login profile I have written that switches you to bash. It is very useful in environments where the system administrator has decided for you that you will use the korn shell, and has no interest in implementing your request for a different shell, one that makes you more productive, and in turn saves your employer or client money. 

#!/bin/ksh
#-----------------------------------------------------------------------------#
#
# Workfile:    $ RCSfile: $
# Date:        $ Date: $
# Revision:    $ Revision: $
# Tag/Label:   $ Name:  $
# SCCSID: @(#) $ Id: $
# Author:      mike@archlug.org
#
# Description: ksh startup file
#
# Synopsis:    .profile
#
# Options:     None
#
# Operands:    None
#
# Exit Status: 0  - Command completed successfully
#              !0 - Command failed
#
# Notes:       This file should be placed in the user HOME directory
#
# Copyright 2004 ArchLUG, Inc., Missouri, USA
# This work is licensed under the Creative Commons Attribution-ShareAlike License.
# To view a copy of this license, visit
#   http://creativecommons.org/licenses/by-sa/1.0/
# or send a letter to
#   Creative Commons, 559 Nathan Abbott Way, Stanford, California 94305, USA.
#
# Revision History is appended.
#
#-----------------------------------------------------------------------------#
version='$ Name:  $'
#
# Switch out of ksh to bash
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
if [ -x /usr/bin/bash ]; then
  if [ "X$SSH_TTY" != "X" ]; then
    case "$0" in
      *ksh) echo "Login under SSH detected. Switching to bash."
            SHELL=/usr/bin/bash
            export SHELL
            exec /usr/bin/bash --login $*
            ;;
      *)    echo "SSH_TTY, not ksh: $*" ;;
    esac
  fi
  case "$0" in
    -*) echo "Login under ksh detected. Switching to bash."
        SHELL=/usr/bin/bash
        export SHELL
        exec /usr/bin/bash --login $*
        ;;
    *)  if [ "X$SHLVL" = "X1" ]; then
          echo "If you just issued a 'su' command,"
          echo "You may want to 'source ~/.bash_profile'."
        fi
        ;;
  esac
fi
# --- FIN ---
#
#-----------------------------------------------------------------------------#
# Revision History:
# $ Log: $
#
#-----------------------------------------------------------------------------#

I also saw some thread on cygwin-app about issues when mangling with the MANPATH, PATH, etc. variables.

Here's what I've done to alleviate the problem of every script tacking on another copy of /usr/local/bin or whatever to PATH, but never checks to see if it is already there, and sometimes even if the path being added exists.

So, I wrote some helper functions that will prepend or append a path to a variable. It will do the right thing when the variable is empty, and won't insert directories multiple times, and won't insert directories that don't exist. I usually have them in someplace like /etc/profile.functions and then just source it in. That way other scripts that play with paths can also use the functions.

It helps to preserve the existing path, setup your own, and then go back and re-add all of the paths in the original path variable. This way, any "extras" get included, but you get to determine the ordering, and eliminate duplicates.

I've created similar functions to remove paths (in case there are multiple entries for the same directory that should be removed).

Here's an example of how you might use such code to reconstruct the PATH in a script such as [/etc/profile] or your [.profile] or .bash_profile: 

# Save our original PATH
OPATH=$PATH
#
# Build a new PATH
PATH=""
addpath /some/path
:
# Add in all you want.
#
# When you are done, add in pre-existing PATH
oifs="$IFS"
IFS=:
for opath in $OPATH
do
  addpath $opath
done
IFS=$oifs
unset oifs opath

And here's my code for the helper functions for the PATH variable:

addpath()

addpath() {
  if [ -d "$1" ]; then
    if [ "X$PATH" = "X" ]; then
        PATH=$1
    else
      local existing=/usr/bin/true
      local oifs="$IFS"
      IFS=:
      local opath
      for opath in $PATH
      do
        [ "X$opath" = "X$1" ] && existing=/usr/bin/false
      done
      IFS=$oifs
      $existing && PATH=${PATH}:$1
    fi
    export PATH
  fi
}

prepath()

prepath() {
  if [ -d "$1" ]; then
    if [ "X$PATH" = "X" ]; then
        PATH=$1
    else
      local existing=/usr/bin/true
      local oifs="$IFS"
      IFS=:
      local opath
      for opath in $PATH
      do
        [ "X$opath" = "X$1" ] && existing=/usr/bin/false
      done
      IFS=$oifs
      $existing && PATH=$1:$PATH
    fi
    export PATH
  fi
}

rmpath()

rmpath() {
  local found
  found=`echo "$PATH" | grep -i "$1"`
  if [ "$found" ]; then
    local oifs="$IFS"
    IFS=:
    local opath
    local npath
    for opath in $PATH
    do
      found=`echo "$opath" | grep -v -i "$1"`
      [ "$found" ] && npath="${npath}:${opath}"
    done
    IFS=$oifs
    PATH=$npath
    export PATH
  fi
}

Just create the related functions for MANPATH, LD_LIBRARY_PATH, and any other list-of-directories type of variable, and you're done.

I just haven't gotten around to writing a function factory for this, so that you can create these functions on-the-fly for any variable. If someone wants to post such functions here, just edit the page.

-- Mike

Here is a nice bash profile I wrote: 

#!/usr/bin/bash
#-----------------------------------------------------------------------------#
#
# Workfile:    $ RCSfile: $
# Date:        $ Date: $
# Revision:    $ Revision: 1.1 $
# Tag/Label:   $ Name:  $
# SCCSID: @(#) $ Id: $
# Author:      mike@archlug.org
#
# Description: bash startup file
#
# Synopsis:    .bash_profile
#
# Options:     None
#
# Operands:    None
#
# Exit Status: 0  - Command completed successfully
#              !0 - Command failed
#
# Notes:       This file should be placed in the user HOME directory
#
# Copyright 2004 ArchLUG, Inc., Missouri, USA
# This work is licensed under the Creative Commons Attribution-ShareAlike License.
# To view a copy of this license, visit
#   http://creativecommons.org/licenses/by-sa/1.0/
# or send a letter to
#   Creative Commons, 559 Nathan Abbott Way, Stanford, California 94305, USA.
#
#-----------------------------------------------------------------------------#
version='$ Name:  $'
#
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
# Guarantee our HOSTNAME
if [ "X$HOSTNAME" = "X" ]; then
  HOSTNAME=`uname -n`
  export HOSTNAME
fi
# Guarantee our LOGNAME
if [ "X$LOGNAME" = "X" ]; then
  if [ "X$USERNAME" = "X" ]; then
    USER=`whoami`
    USERNAME=$USER
    export USER USERNAME
  fi
  LOGNAME=$USERNAME
  export LOGNAME
fi
#
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
# Allow group access by default
umask 002
#
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
# Setup for a PC keyboard
tty=`tty`
if [ "X$tty" != "Xnot a tty" ]; then
  stty istrip
  stty erase '^H'
  stty intr '^C'
fi
unset tty
#
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
# Run all of the profile.d scripts
# Note that these are supplied by separate packages
if [ -d "$HOME/profile.d" ]; then
  for f in $HOME/profile.d/*
  do
    [ -f "$f" ] && . "$f"
  done
  unset f
fi
#
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
# Run our host-specific bash_profile
[ -f $HOME/.bash_profile.$HOSTNAME ] && . $HOME/.bash_profile.$HOSTNAME
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
# Run our user-specific bash_profile
[ -f $HOME/.bash_profile.$LOGNAME ] && . $HOME/.bash_profile.$LOGNAME
#
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
# Make sure these are exported
export PATH MANPATH LD_LIBRARY_PATH
#
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
# Setup aliases
[ -f /etc/bashrc ] && . /etc/bashrc
[ -f /etc/bash.bashrc ] && . /etc/bash.bashrc
[ -f $HOME/.bashrc ] && . $HOME/.bashrc
[ -f $HOME/.bashrc.$HOSTNAME ] && . $HOME/.bashrc.$HOSTNAME
[ -f $HOME/.bashrc.$LOGNAME ] && . $HOME/.bashrc.$LOGNAME
#
# Set your DISPLAY properly on Cygwin
ssh_from=`echo $SSH_CLIENT | /usr/bin/cut -d' ' -f1`
if [ "X$ssh_from" = "X127.0.0.1" ]; then
  if [ "X$DISPLAY" = "X" ]; then
    DISPLAY="localhost:0"
    export DISPLAY
    if [ "X$OSTYPE" = "Xcygwin" ]; then
      xauth add `echo "${DISPLAY}" | sed 's/.*\(:.*\)/\1/'` . `/usr/bin/mcookie`
    fi
  fi
fi
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
# Setup for remote X sessions via sudo
if [ "X$TERM" = "Xxterm" ]; then
  if [ "X$DISPLAY" = "X" ]; then
    /usr/bin/echo "Enter DISPLAY [localhost:10]:\c"
    read DISPLAY ; export DISPLAY
    DISPLAY=${DISPLAY:-localhost:10}
  else
    echo "DISPLAY=$DISPLAY"
  fi
  disp=`echo $DISPLAY | cut -d ':' -f 2`
  uid=`who am i | cut -d ' ' -f 1`
  home=`grep $uid /etc/passwd | head -1 | cut -d ':' -f 6`
  xauth=$XAUTHORITY
  [ "X$xauth" = "X" ] && xauth=$home/.Xauthority
  if [ -f $xauth ]; then
    xauth -i -q -f $xauth extract - :$disp 2>/dev/null | xauth merge -
    euid=`whoami`
    [ "X$uid" = "X$euid" ] && chmod +r $xauth
  fi
  unset disp uid euid home xauth
  stty erase '^?'
fi
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
# Cleanup functions
unset addpath prepath addmanpath premanpath addlibpath prelibpath
unset delpath delmanpath dellibpath
unset version
# --- FIN ---
#
#-----------------------------------------------------------------------------#
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