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# Contributed by Noah Friedman.
# To avoid using a function in bash, you can use the `builtin' or
# `command' builtins, but neither guarantees that you use an external
# program instead of a bash builtin if there's a builtin by that name. So
# this function can be used like `command' except that it guarantees the
# program is external by first disabling any builtin by that name. After
# the command is done executing, the state of the builtin is restored.
function external ()
{
local state=""
local exit_status
if builtin_p "$1"; then
state="builtin"
enable -n "$1"
fi
command "$@"
exit_status=$?
if [ "$state" = "builtin" ]; then
enable "$1"
fi
return ${exit_status}
}
# What is does is tell you if a particular keyword is currently enabled as
# a shell builtin. It does NOT tell you if invoking that keyword will
# necessarily run the builtin. For that, do something like
#
# test "$(builtin type -type [keyword])" = "builtin"
#
# Note also, that disabling a builtin with "enable -n" will make builtin_p
# return false, since the builtin is no longer available.
function builtin_p ()
{
local word
set $(builtin type -all -type "$1")
for word in "$@" ; do
if [ "${word}" = "builtin" ]; then
return 0
fi
done
return 1
}
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