echo The tasks of the IRAF RVSAO spectrum package may be run from the
echo Unix/Linux command line as if you were inside IRAF.  The parameters
echo used come from the IRAF home directory defined by the irafhome
echo environment variable or if that is not present, the IRAF/ subdirectory
echo of the user's home directory.
 
bcvcorr    Compute barycentric velocity correction for a spectrum
contpars   Set continuum fitting parameters for xcsao and emsao
contsum    Set continuum fitting parameters for sumspec
emsao      Find velocities (red shifts) of emission lines in a spectrum
pemsao     Find velocities (red shifts) of emission lines in a spectrum
emplot     Plot a spectrum labelling emission and absorption lines
eqwidth    Find equivalent widths of emission and absorption lines in a spectrum
ihelp      Print help file of an IRAF task
irafhelp   Print help file of an IRAF task
linespec   Make an emission line template spectrum given a line list
listspec   List the spectrum in the specified format
sumspec    Add spectra, shift them, and/or remove continua
xcsao      Cross-correlate a spectrum against a set of templates
pxcsao     Cross-correlate a spectrum against a set of templates
 
If you type the command with no arguments, you will get a simple help
message with options for parameter access and more complete help,
for example:

$ xcsao
XCSAO: Cross-correlate a spectrum against a set of templates
usage: xcsao spectrum [templates=xxx][other arguments]
      xcsao help  for IRAF help
      xcsao dpar  to dump parameters
      xcsao epar  to edit parameters
      xcsao lpar  to list parameters

where
    help opens IRAF help for the task
    dpar dumps the parameters using IRAF's dpar as task.parameter=value
echo "    epar edits the parameters using IRAF's eparam
    lpar list the parameters using IRAF's lparam"
