anntnzrb ca9b3952e6 Exit codes, stderr suppression, minor edits (#788) ...

This is a re-attempt of #643 

- `[ "$archive" = "" ]` may be replaced with `[ -z "$archive" ]`
- added exit codes
- upon entering `ext -c` with no arguments stderr will be thrown
from readlink, should be suppressed

2020-08-27 15:57:16 -04:00

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