code: def main():
      
      save_plots = False
      if '-sav' in sys.argv:
          save_plots = True
          interactive = False
  
      if '-h' in sys.argv:
          print(main.__doc__)
          sys.exit()
      fmt = pmag.get_named_arg('-fmt', 'svg')
      fname = pmag.get_named_arg('-f', '')
      outfile = pmag.get_named_arg("-F", "")
      norm = 1
      if '-N' in sys.argv:
          norm = 0
      if '-twin' in sys.argv:
          norm = - 1
      binsize = pmag.get_named_arg('-b', 0)
      if '-xlab' in sys.argv:
          ind = sys.argv.index('-xlab')
          xlab = sys.argv[ind+1]
      else:
          xlab = 'x'
      data = []
      if not fname:
          print('-I- Trying to read from stdin... <ctrl>-c to quit')
          data = np.loadtxt(sys.stdin, dtype=np.float)
  
      ipmag.histplot(fname, data, outfile, xlab, binsize, norm,
               fmt, save_plots, interactive)
docs: NAME
         histplot.py
  
      DESCRIPTION
         makes histograms for data
  
      OPTIONS
         -h prints help message and quits
         -f input file name
         -b binsize
         -fmt [svg,png,pdf,eps,jpg] specify format for image, default is svg
         -sav save figure and quit
         -F output file name, default is hist.fmt
         -N don't normalize
         -twin plot both normalized and un-normalized y axes
         -xlab Label of X axis
         -ylab Label of Y axis
  
      INPUT FORMAT
          single variable
  
      SYNTAX
         histplot.py [command line options] [<file]