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string-upper(1)

string-upper - convert strings to uppercase

STRING-UPPER(1) fish-shell STRING-UPPER(1)

string-upper - convert strings to uppercase

string upper [-q | --quiet] [STRING ...]

string upper converts each string argument to uppercase. Exit status: 0 if at least one string was converted to uppercase, else 1. This means that in conjunction with the -q flag you can readily test whether a string is already uppercase.

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September 9, 2026 4.9

fish 4.9.3-r0 · os · ingested 2026-09-30