System shell access

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B.7 System shell access

For scripts, the os.system methods are the preferred way to access system shell commands (see § B.7.1).

In interactive mode, any input line beginning with a ’!’ character is passed verbatim (minus the ’!’) to the underlying operating system. Several common commands (ls, pwd, less) may be executed with or without the ’!’. Note that the cd command must be executed without the ’!’, and the cp command must use ’!’ as there is a conflict with the cp tool in casapy.

For example:

  CASA [1]: pwd
  /export/home/corsair-vml/jmcmulli/data
  CASA [2]: ls n*
  ngc5921.ms ngc5921.py
  CASA [3]: !cp -r ../test.py .

  B.7.1 Using the os.system methods
  B.7.2 Directory Navigation
  B.7.3 Shell Command and Capture

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