Cygwin .bashrc PATH gets duplicate entries - bash

Question

I've got the following variable set in my cygwin $HOME/.bashrc
PATH=/bin:/usr/sbin:"/cygdrive/c/Program Files/Java/jdk1.6.0_26/bin":$PATH
Problem is that when I login and the .bashrc gets executed, I get starting duplicates as follows:
Dragos#dragos ~
$ echo $PATH | tr ':' '\n'
/bin
/usr/sbin
/cygdrive/c/Program Files/Java/jdk1.6.0_26/bin
/bin
/usr/sbin
/cygdrive/c/Program Files/Java/jdk1.6.0_26/bin
/usr/local/bin
/usr/bin
/cygdrive/c/WINDOWS
/cygdrive/c/WINDOWS/system32
/cygdrive/c/WINDOWS/System32/Wbem
/cygdrive/c/curl
/
/cygdrive/c/gnupg
/cygdrive/c/Progra~1/cvsnt
/cygdrive/c/Progra~1/GNU/WinCvs 2.0
/cygdrive/c/Progra~1/Notepad++
/cygdrive/c/Progra~1/PuTTY
/cygdrive/c/Progra~1/WinSCP
/cygdrive/c/Python26
/cygdrive/c/Python26/Lib/site-packages/PyQt4/bin
/cygdrive/c/Python26/Scripts
/usr/bin
/usr/lib/lapack
Does anyone know what causes this?
Here's my .bashrc
$ cat ~/.bashrc
# base-files version 3.7-1
# To pick up the latest recommended .bashrc content,
# look in /etc/defaults/etc/skel/.bashrc
# Modifying /etc/skel/.bashrc directly will prevent
# setup from updating it.
# The copy in your home directory (~/.bashrc) is yours, please
# feel free to customise it to create a shell
# environment to your liking. If you feel a change
# would be benificial to all, please feel free to send
# a patch to the cygwin mailing list.
# User dependent .bashrc file
# Shell Options
# #############
# See man bash for more options...
# Don't wait for job termination notification
# set -o notify
# Don't use ^D to exit
# set -o ignoreeof
# Use case-insensitive filename globbing
# shopt -s nocaseglob
# Make bash append rather than overwrite the history on disk
# shopt -s histappend
# When changing directory small typos can be ignored by bash
# for example, cd /vr/lgo/apaache would find /var/log/apache
# shopt -s cdspell
# Completion options
# ##################
# These completion tuning parameters change the default behavior of bash_completion:
# Define to access remotely checked-out files over passwordless ssh for CVS
# COMP_CVS_REMOTE=1
# Define to avoid stripping description in --option=description of './configure --help'
# COMP_CONFIGURE_HINTS=1
# Define to avoid flattening internal contents of tar files
# COMP_TAR_INTERNAL_PATHS=1
# If this shell is interactive, turn on programmable completion enhancements.
# Any completions you add in ~/.bash_completion are sourced last.
# case $- in
# *i*) [[ -f /etc/bash_completion ]] && . /etc/bash_completion ;;
# esac
# History Options
# ###############
# Don't put duplicate lines in the history.
# export HISTCONTROL="ignoredups"
# Ignore some controlling instructions
# export HISTIGNORE="[ ]*:&:bg:fg:exit"
# Whenever displaying the prompt, write the previous line to disk
# export PROMPT_COMMAND="history -a"
# Aliases
# #######
# Some example alias instructions
# If these are enabled they will be used instead of any instructions
# they may mask. For example, alias rm='rm -i' will mask the rm
# application. To override the alias instruction use a \ before, ie
# \rm will call the real rm not the alias.
# Interactive operation...
# alias rm='rm -i'
# alias cp='cp -i'
# alias mv='mv -i'
# Default to human readable figures
# alias df='df -h'
# alias du='du -h'
# Misc :)
# alias less='less -r' # raw control characters
# alias whence='type -a' # where, of a sort
# alias grep='grep --color' # show differences in colour
# Some shortcuts for different directory listings
alias ls='ls -hF --color=tty' # classify files in colour
# alias dir='ls --color=auto --format=vertical'
# alias vdir='ls --color=auto --format=long'
# alias ll='ls -l' # long list
# alias la='ls -A' # all but . and ..
# alias l='ls -CF' #
# Functions
# #########
# Some example functions
# function settitle() { echo -ne "\e]2;$#\a\e]1;$#\a"; }
# Notepad++ function
# Pass in a UNIX path
# Starts notepad++ given a UNIX path argument
function notepadpp() {
local notepadUnixPath="/cygdrive/c/Program Files/Notepad++/notepad++.exe"
#local notepadArgPath=$(eval $(echo cygpath -w -a "$*"))
local notepadArgPath=`cygpath -w -a "$*"`
"$notepadUnixPath" -multiInst "$notepadArgPath" &
}
alias notepad++=notepadpp
# Explorer function
# Pass in a UNIX path
# Starts explorer given a UNIX path argument
function explorer() {
local explorerArgPath=`cygpath -w -a "$*"`
cmd /C start "" "$explorerArgPath" &
}
alias vi=vim
# Change filename starting with prefix string to another prefix string
alias mvprefix='$HOME/mvprefix.sh'
# Change filename ending with suffix string to another suffix string
alias mvsuffix='$HOME/mvsuffix.sh'
# Change filename ending with suffix string to a string prefixed with todays date
alias todaysuffix='$HOME/todaysuffix.sh'
# Generate secure passwords by default
alias pwgen='pwgen -y -c -s -n'
export INPUTRC=$HOME/.inputrc
export EDITOR=vim
export PATH=/bin:/usr/sbin:"/cygdrive/c/Program Files/Java/jdk1.6.0_26/bin":$PATH
# Overwrite DOS env variable APPDATA with our own for installing perl CPANPLUS
export APPDATA=$HOME
Here's my .bash_profile
$ cat .bash_profile
# base-files version 3.7-1
# To pick up the latest recommended .bash_profile content,
# look in /etc/defaults/etc/skel/.bash_profile
# Modifying /etc/skel/.bash_profile directly will prevent
# setup from updating it.
# The copy in your home directory (~/.bash_profile) is yours, please
# feel free to customise it to create a shell
# environment to your liking. If you feel a change
# would be benifitial to all, please feel free to send
# a patch to the cygwin mailing list.
# ~/.bash_profile: executed by bash for login shells.
# source the system wide bashrc if it exists
if [ -e /etc/bash.bashrc ] ; then
source /etc/bash.bashrc
fi
# source the users bashrc if it exists
if [ -e "${HOME}/.bashrc" ] ; then
source "${HOME}/.bashrc"
fi
# Set PATH so it includes user's private bin if it exists
# if [ -d "${HOME}/bin" ] ; then
# PATH=${HOME}/bin:${PATH}
# fi
# Set MANPATH so it includes users' private man if it exists
# if [ -d "${HOME}/man" ]; then
# MANPATH=${HOME}/man:${MANPATH}
# fi
# Set INFOPATH so it includes users' private info if it exists
# if [ -d "${HOME}/info" ]; then
# INFOPATH=${HOME}/info:${INFOPATH}
# fi
Here's my /etc/bash.bashrc
$ cat /etc/bash.bashrc
# To the extent possible under law, the author(s) have dedicated all
# copyright and related and neighboring rights to this software to the
# public domain worldwide. This software is distributed without any warranty.
# You should have received a copy of the CC0 Public Domain Dedication along
# with this software.
# If not, see <http://creativecommons.org/publicdomain/zero/1.0/>.
# base-files version 4.1-1
# /etc/bash.bashrc: executed by bash(1) for interactive shells.
# The latest version as installed by the Cygwin Setup program can
# always be found at /etc/defaults/etc/bash.bashrc
# Modifying /etc/bash.bashrc directly will prevent
# setup from updating it.
# System-wide bashrc file
# Check that we haven't already been sourced.
([[ -z ${CYG_SYS_BASHRC} ]] && CYG_SYS_BASHRC="1") || return
# If not running interactively, don't do anything
[[ "$-" != *i* ]] && return
# Set a default prompt of: user#host and current_directory
PS1='\[\e]0;\w\a\]\n\[\e[32m\]\u#\h \[\e[33m\]\w\[\e[0m\]\n\$ '
# Uncomment to use the terminal colours set in DIR_COLORS
# eval "$(dircolors -b /etc/DIR_COLORS)"
I don't modify $PATH in my $HOME/.bashrc anywhere other than the set PATH= command above.
If I prepend only one path to $PATH, that would get duplicated as well:
PATH="/cygdrive/c/Program Files/Java/jdk1.6.0_26/bin":$PATH
Results in:
Dragos#dragos ~
$ echo $PATH | tr ':' '\n'
/cygdrive/c/Program Files/Java/jdk1.6.0_26/bin
/cygdrive/c/Program Files/Java/jdk1.6.0_26/bin
/usr/local/bin
/usr/bin
/cygdrive/c/WINDOWS
/cygdrive/c/WINDOWS/system32
/cygdrive/c/WINDOWS/System32/Wbem
/cygdrive/c/curl
/
/cygdrive/c/gnupg
/cygdrive/c/Progra~1/cvsnt
/cygdrive/c/Progra~1/GNU/WinCvs 2.0
/cygdrive/c/Progra~1/Notepad++
/cygdrive/c/Progra~1/PuTTY
/cygdrive/c/Progra~1/WinSCP
/cygdrive/c/Python26
/cygdrive/c/Python26/Lib/site-packages/PyQt4/bin
/cygdrive/c/Python26/Scripts
/usr/bin
/usr/lib/lapack
So... Why the duplicates?
Addendum:
I found that I'm executing bash twice in my C:\cygwin\Cygwin.bat
The reason is that I have a context menu command to "Open Bash Here" that passes
a starting path to C:\cygwin\Cygwin.bat
Here's my C:\cygwin\Cygwin.bat
#echo off
C:
set PATH=%PATH%;C:\cygwin\bin
REM SHELL needed for any screen instances started from bash
set SHELL=/bin/bash
set HOME=C:\cygwin\home\Dragos
set HOMEDRIVE=C:
set HOMEPATH=\cygwin\home\Dragos
REM
if not [%1]==[] (
C:\cygwin\bin\cygpath %1 > tmpFile
set /p startingpath= < tmpFile
del tmpFile
)
if "%startingpath%"=="" start C:\cygwin\bin\mintty.exe --icon /Cygwin-Terminal.ico --size 140,50 --exec /bin/bash --login -c "exec /bin/bash -rcfile ~/.bashrc"
if not "%startingpath%"=="" start C:\cygwin\bin\mintty.exe --icon /Cygwin-Terminal.ico --size 140,50 --exec /bin/bash --login -c "cd '%startingpath%'; exec /bin/bash -rcfile ~/.bashrc"
exit
Addendum:
Figured out that I need to pass --noprofile --norc to bash when calling bash.
Here's the updated C:\cygwin\Cygwin.bat
#echo off
C:
set PATH=%PATH%;C:\cygwin\bin
REM SHELL needed for any screen instances started from bash
set SHELL=/bin/bash
set HOME=C:\cygwin\home\Dragos
set HOMEDRIVE=C:
set HOMEPATH=\cygwin\home\Dragos
REM
if not [%1]==[] (
C:\cygwin\bin\cygpath %1 > tmpFile
set /p startingpath= < tmpFile
del tmpFile
)
if "%startingpath%"=="" start C:\cygwin\bin\mintty.exe --icon /Cygwin-Terminal.ico --size 140,50 --exec /bin/bash --login
if not "%startingpath%"=="" start C:\cygwin\bin\mintty.exe --icon /Cygwin-Terminal.ico --size 140,50 --exec /bin/bash --noprofile --norc --login -c "cd '%startingpath%'; exec /bin/bash -rcfile ~/.bashrc"
exit

Answer 1

I don't have Cygwin installed, and I don't have a Windows machine, so I can't give you a boatload of details.
See if the man bash page can help you. In normal BASH, the /etc/profile, /etc/bashrc, the $HOME/.bash_profile, the $HOME/.bashrc, and sometimes the $HOME/.profile are all read in depending whether this is a login shell or not. Cygwin has it's own special versions of each of these files in the /etc directory. However, there's also other scripts that get invoked and can affect your Cygwin environment. For example, there are special scripts to import Windows environment variables including %PATH%.
In Cygwin, the default is to include the Windows %PATH% variable as part of the Cygwin path. It's actually a general import of all Windows environment variables (and depending upon the installation, the \ is sometimes converted to a / and short directory names are used).
If you open xterm windows and not standard Windows console windows for your Cygwin command line, you'll also have to check the xserve script (or whatever it's called) because that also imports a lot of stuff into the Cygwin environment.
I've used Cygwin in the past, and every time I use Cygwin, I find myself chasing down these exact things, plus a few other issues: For example, the default Kornshell load environment script has a bug in it. I believe they have a literal "^G" instead of a Ctrl-G, or maybe it was another control character. I can't remember. All I know is I spend about an hour or two cleaning up my Cygwin environment every time I install it. I like Cygwin, but it can be a pain.
Sorry I can't give you more specific directions.

Answer 2

Just set the PATH to whatever you like (without a reference to $PATH). You shouldn't trust the PATH that some random sysadmin thinks is a good PATH anyway. Do this in the file sourced last for your shell.