Environment Variables

Some commands to remember about Environment Variables:

echo $HOME
/Users/jessica

echo $PATH
/Library/Frameworks/Python.framework/Versions/Current/bin:/sw/bin:/sw/sbin:/Library/Frameworks/Python.framework/Versions/Current/bin:/Users/jessica/python/MyModules:/Users/jessica/idl/photoop/bin:/Users/jessica/idl/idlspec2d/bin:/Users/jessica/idl/idlutils/bin:/Applications/rsi/idl/bin:/usr/local/bin:/usr/X11R6/bin:/bin:/sbin:/usr/bin:/usr/sbin:/usr/texbin:/usr/local/bin:/Users/jessica/bin:/usr/local/bin:.:/Users/jessica/bin:/usr/local/bin:.

which ls
/bin/ls

env
MANPATH=/sw/share/man:/Library/Frameworks/Python.framework/Versions/Current/share/man:/usr/X11R6/share/man:/usr/share/man:/usr/X11/man:/sw/lib/perl5/5.10.0/man:/usr/X11R6/man
IDLSPEC2D_DIR=/Users/jessica/idl/idlspec2d
TERM_PROGRAM=Apple_Terminal
TERM=xterm-color
SHELL=/bin/bash
TMPDIR=/var/folders/ay/ay3fH9RRFLSKHrn6zK-vhE+++TI/-Tmp-/
PERL5LIB=/sw/lib/perl5:/sw/lib/perl5/darwin
IDL_DIR=/Applications/rsi/idl
Apple_PubSub_Socket_Render=/tmp/launch-BDx2kp/Render
CVSROOT=:pserver:anonymous@sdsscvs.astro.princeton.edu:/usr/local/cvsroot
TERM_PROGRAM_VERSION=273
KCORRECT_DIR=/Users/jessica/idl/kcorrect
SGML_CATALOG_FILES=/sw/etc/sgml/catalog
USER=jessica
LD_LIBRARY_PATH=:/Users/jessica/idl/kcorrect/lib
COMMAND_MODE=unix2003
SSH_AUTH_SOCK=/tmp/launch-k6t2m6/Listeners
__CF_USER_TEXT_ENCODING=0x1F5:0:0
PHOTOOP_DIR=/Users/jessica/idl/photoop
PATH=/Library/Frameworks/Python.framework/Versions/Current/bin:/sw/bin:/sw/sbin:/Library/Frameworks/Python.framework/Versions/Current/bin:/Users/jessica/python/MyModules:/Users/jessica/idl/photoop/bin:/Users/jessica/idl/idlspec2d/bin:/Users/jessica/idl/idlutils/bin:/Applications/rsi/idl/bin:/usr/local/bin:/usr/X11R6/bin:/bin:/sbin:/usr/bin:/usr/sbin:/usr/texbin:/usr/local/bin:/Users/jessica/bin:/usr/local/bin:.:/Users/jessica/bin:/usr/local/bin:.
MKL_NUM_THREADS=1
XML_CATALOG_FILES=/sw/etc/xml/catalog
SPECTRO_DATA=/Users/jessica/spectro
PWD=/Users/jessica
LANG=en_US.UTF-8
SHLVL=1
HOME=/Users/jessica
IDL_PATH=+./:+/Users/jessica/Documents/Research/IDLCode/newman/spherepairs:+/Users/jessica/Documents/Research/IDLCode:+/Users/jessica/Documents/Research/IDLCode/newman:+/Users/jessica/Documents/Research/QSOClustering/pro:+/Users/jessica/idl:+/Users/jessica/idl/photoop/pro:+/Users/jessica/idl/idlspec2d/pro:+/Users/jessica/idl/idlutils/pro:+/Users/jessica/idl/idlutils/goddard/pro:+/Applications/rsi/idl/lib
PYTHONPATH=/Users/jessica/python/MyModules:/Users/jessica/idl/photoop/bin:/Users/jessica/idl/idlspec2d/bin:/Users/jessica/idl/idlutils/bin:/Applications/rsi/idl/bin:/usr/local/bin:/usr/X11R6/bin:/bin:/sbin:/usr/bin:/usr/sbin:/usr/texbin:/usr/local/bin
LOGNAME=jessica
CVS_RSH=ssh
IDLUTILS_DIR=/Users/jessica/idl/idlutils
INFOPATH=/sw/share/info:/sw/info:/usr/share/info
DISPLAY=/tmp/launch-cHq9RL/org.x:0
QSO_DIR=/Users/jessica/Documents/Research/QSODir
_=/usr/bin/env

type -a python
python is /Library/Frameworks/Python.framework/Versions/Current/bin/python
python is /Library/Frameworks/Python.framework/Versions/Current/bin/python
python is /usr/local/bin/python
python is /usr/bin/python
python is /usr/local/bin/python
python is /usr/local/bin/python
python is /usr/local/bin/python

export VARIABLE="value"
echo $VARIABLE
value