help externs for core> help externs {flags} ...rest
--find, -f {string}: string to find in extern names and usage...rest: the name of extern to get help on| input | output | 
|---|---|
| nothing | table | 
show all externs
>help externs
show help for single extern
>help externssmth
search for string in extern names and usages
>help externs--findsmth
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