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Problemas com PATH

Preciso incluir o caminho /home/marcelo/bin no PATH permanentemente.
Eu tambem gostaria que os arquivos internos a esta pasta tambem
ficassem no PATH.

O meu .bashrc está assim:

:~$ cat .bashrc
# ~/.bashrc: executed by bash(1) for non-login shells.
# see /usr/share/doc/bash/examples/startup-files (in the package bash-doc)
# for examples

# If not running interactively, don't do anything
[ -z "$PS1" ] && return

# don't put duplicate lines in the history. See bash(1) for more options
export HISTCONTROL=ignoredups

# check the window size after each command and, if necessary,
# update the values of LINES and COLUMNS.
shopt -s checkwinsize

# make less more friendly for non-text input files, see lesspipe(1)
[ -x /usr/bin/lesspipe ] && eval "$(lesspipe)"

# set variable identifying the chroot you work in (used in the prompt below)
if [ -z "$debian_chroot" ] && [ -r /etc/debian_chroot ]; then
    debian_chroot=$(cat /etc/debian_chroot)

# set a fancy prompt (non-color, unless we know we "want" color)
case "$TERM" in
    PS1='${debian_chroot:+($debian_chroot)}\u@\h:\w\$ '

# Comment in the above and uncomment this below for a color prompt

# If this is an xterm set the title to user@host:dir
case "$TERM" in
    PROMPT_COMMAND='echo -ne "\033]0;${USER}@${HOSTNAME}: ${PWD/$HOME/~}\007"'

# Alias definitions.
# You may want to put all your additions into a separate file like
# ~/.bash_aliases, instead of adding them here directly.
# See /usr/share/doc/bash-doc/examples in the bash-doc package.

#if [ -f ~/.bash_aliases ]; then
#    . ~/.bash_aliases

# enable color support of ls and also add handy aliases
if [ "$TERM" != "dumb" ]; then
    eval "`dircolors -b`"
    alias ls='ls --color=auto'
    #alias dir='ls --color=auto --format=vertical'
    #alias vdir='ls --color=auto --format=long'

# some more ls aliases
#alias ll='ls -l'
#alias la='ls -A'
#alias l='ls -CF'

# enable programmable completion features (you don't need to enable
# this, if it's already enabled in /etc/bash.bashrc and /etc/profile
# sources /etc/bash.bashrc).
if [ -f /etc/bash_completion ]; then
    . /etc/bash_completion

# Instalacao das Funcoes ZZ (www.funcoeszz.net)
source /usr/bin/funcoeszz
export ZZPATH=/usr/bin/funcoeszz

E o meu .bash_profile está assim:

:~$ cat .bash_profile
# ~/.bash_profile: executed by bash(1) for login shells.
# see /usr/share/doc/bash/examples/startup-files for examples.
# the files are located in the bash-doc package.

# the default umask is set in /etc/login.defs
#umask 022

# include .bashrc if it exists
if [ -f ~/.bashrc ]; then
    . ~/.bashrc

# set PATH so it includes user's private bin if it exists
if [ -d ~/bin ] ; then

export PATH

ls='ls --colors=auto'


O que há de errado? Pois, toda vez que inicio, o PATH está assim:

:~$ echo $PATH

Ai eu tenho que adicionar o que eu quero na unha:

:~$ PATH=$PATH:/home/marcelo/bin
:~$ echo $PATH

Onde está o erro?

Muito obrigado

Marcelo Luiz de Laia
Diamantina - MG - Brasil (Brazil)
Linux user number 487797

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