shell vars

• echo $SHELL #we did this before
• echo $TERM
• echo $PAGER
• echo $PRINTER
• echo $TAB TAB

• export TEMP=$PS1 #save it for later
  export PS1="hi my name is hal: "
  export PS1="\t \u@\h: \w\n% "
  #if you want to change it back to what it was 
  #before:
  export PS1=\$TEMP 
   # otherwise, it'll reset next time we run bash,
   # we'll learn later how to save settings like
   # this.
  

• shell variables can affect things besides the shell.

      export TEMP2=$TERM
      export TERM=dumb
      emacs -nw -q
      export TERM=$TEMP2
      emacs -nw -q