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#: * `pin` <formulae>:
#: Pin the specified <formulae>, preventing them from being upgraded when
#: issuing the `brew upgrade` command. See also `unpin`.
require "formula"
module Homebrew
module_function
def pin
raise FormulaUnspecifiedError if ARGV.named.empty?
ARGV.resolved_formulae.each do |f|
if f.pinned?
opoo "#{f.name} already pinned"
elsif !f.pinnable?
onoe "#{f.name} not installed"
else
f.pin
end
end
end
end
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