Macros, scripts, and programs

• limited to current or default shell

• perform the same action(s) many times

• no flow control (i.e., no conditional execution)

• no passing of parameters

• no variable manipulation

    Example:

    %>  cat macro
    \cp −p im001.fits NGC3710_B.fits
    \cp −p im002.fits NGC3710_V.fits
    \cp −p im003.fits NGC3710_R.fits
    ...

    %>  source macro

    or:

    %>  chmod +x macro
    %>  macro