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Re:The -a to -z of Command-Line Options (2003) by lunchables on Monday December 10, 2018 @09:08AM (#18647957)
In my version of pkill the short version is specifically disabled.

-v, --inverse

              Negates the matching.  This option is usually used in pgrep's context.  In pkill's context the short option is disabled to avoid accidental usage of the option

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