diff [-ru] file1 file2

expr [expression]

id [-ruGgn] username

printf format [argument...]

test [expression...]

tr string1 [string2]

unexpand [-a] [-t N] [file...]

od/hd

uuencode

uudecode

mktemp

passwd (maybe a candidate for ubase instead?)

sed

patch

ed

awk

bc/dc

fmt

install

find (bare minimum)

xargs (bare minimum)