A.3. Options
When setting an option with the O command, it is necessary to type only enough initial letters to distinguish it from the other options. They are not case sensitive.
recallCommand shellBang
Change the character used for command recall or shell escape respectively. Note in the case of the latter that it still has to be repeated; you are changing each !, not the !! string.
pager
Set to | followed by the name of the program you want to use for paging; for example: O pag='|less'.
A.3.1. Options affecting the V, X, and x commands
arrayDepth hashDepth
Set the maximum number of elements to print.
quote HighBit undefPrint
Change the style of string dumps. The valid values for quote are ", ', or auto.
globPrint
This is a Boolean ...
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