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formats.row.QUOTE_SHELL_SPECIALS

QUOTE_SHELL_SPECIALS : &[u8] constant [source] ¶ constant [source] ¶ QUOTE_SHELL_SPECIALS: Bytes that #{q:} prefixes with a backslash.

This is tmux's format_quote_shell set. None of these bytes is an octal digit or one of the letters vis emits, so the two escaping layers below compose into one unambiguous grammar.

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