Shell Command and Capture

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B.7.3 Shell Command and Capture

See also § B.9 for the use of the command history.

1. sx shell_command, !!shell_command - this captures the output to a list

  CASA [1]: sx pwd # stores output of ’pwd’ in a list
    Out[1]: [’/home/basho3/jmcmulli/pretest’]

  CASA [2]: !!pwd  # !! is a shortcut for ’sx’
    Out[2]: [’/home/basho3/jmcmulli/pretest’]

  CASA [3]: sx ls v* # stores output of ’pwd’ in a list
    Out[3]:
  [’vla_calplot.jpg’,
   ’vla_calplot.png’,
   ’vla_msplot_cals.jpg’,
   ’vla_msplot_cals.png’,
   ’vla_plotcal_bpass.jpg’,
   ’vla_plotcal_bpass.png’,
   ’vla_plotcal_fcal.jpg’,
   ’vla_plotcal_fcal.png’,
   ’vla_plotvis.jpg’,
   ’vla_plotvis.png’]

  CASA [4]: x=_ # remember ’_’ is a shortcut for the output from the last command

  CASA [5]: x
    Out[5]:
  [’vla_calplot.jpg’,
   ’vla_calplot.png’,
   ’vla_msplot_cals.jpg’,
   ’vla_msplot_cals.png’,
   ’vla_plotcal_bpass.jpg’,
   ’vla_plotcal_bpass.png’, ’vla_plotcal_fcal.jpg’,
   ’vla_plotcal_fcal.png’,
   ’vla_plotvis.jpg’,
   ’vla_plotvis.png’]

  CASA [6]: y=Out[2] # or just refer to the enumerated output

  CASA [7]: y
    Out[7]: [’/home/basho3/jmcmulli/pretest’]

2. sc - captures the output to a variable; options are ’-l’ and ’-v’

  CASA [1]: sc x=pwd # capture output from ’pwd’ to the variable ’x’

  CASA [2]: x
    Out[2]: ’/home/basho3/jmcmulli/pretest’

  CASA [3]: sc -l x=pwd # capture the output from ’pwd’ to the variable ’x’ but
                        # split newlines into a list (similar to sx command)

  CASA [4]: x
    Out[4]: [’/home/basho3/jmcmulli/pretest’]

  CASA [5]: sc -v x=pwd # capture output from ’pwd’ to a variable ’x’ and
                        # show what you get (verbose mode)
  x ==
  ’/home/basho3/jmcmulli/pretest’

  CASA [6]: x
    Out[6]: ’/home/basho3/jmcmulli/pretest’

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