$ std -l python line-exec.py

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line-exec.py works.

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Write to stderr too

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Add -A/--after and -B/--before options

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Merge branch 'add-line-exec.wip'

* add-line-exec.wip:
  Add -A/--after and -B/--before options
  Write to stderr too
  line-exec.py works.
  $ std -l python line-exec.py

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