here's what's currently in use:
basename
cat
chmod
cmp
comm
cp
cut
date
dirname
du
echo
egrep
env
find
getconf
grep
head
hostname
id
ln
ls
md5sum
mkdir
mktemp
mv
od
paste
pgrep
pkill
ps
pwd
readlink
realpath
rm
rmdir
sed
setsid
sha1sum/sha256sum/sha512sum
sleep
sort
stat
tail
tar
tee
touch
true
POSIX only mentions -i/stdin, but GNU patch -- and Larry Wall's patch 1.3,
found via https://en.wikipedia.org/wiki/Patch_(Unix) -- also support
supplying the name of the file to patch and the name of the patch file
as optional arguments.
The AOSP build makes use of this syntax to patch snakeyaml
