C. Comparison of POSIX, GNU, and BSD utility programs

POSIX, BSD, GNU, and Linux Standard Base Utilities

Utility	POSIX	BSD	GNU	DropBear	Linux Standard Base
awk	Yes	Yes	Yes	No	Yes
bash	No	Yes	Yes	No	No
cat	Yes	Yes	Yes	Yes	Yes
chmod	Yes	Yes	Yes	No	Yes
chown	Yes	Yes	Yes	No	Yes
cp	Yes	Yes	Yes	Yes	Yes
crontab	Yes	Yes	Yes	No	Yes
csh	No	Yes	Yes	No	No
curl	No	Yes	Yes	No	No
cut	Yes	Yes	Yes	No	Yes
date	Yes	Yes	Yes	Yes	Yes
dd	Yes	Yes	Yes	No	Yes
df	Yes	Yes	Yes	No	Yes
diff	Yes	Yes	Yes	No	Yes
du	Yes	Yes	Yes	No	Yes
echo	Yes	Yes	Yes	Yes	Yes
ed	Yes	Yes	Yes	No	Yes
env	Yes	Yes	Yes	No	Yes
ex	No	Yes	Yes	No	No
expand	Yes	Yes	Yes	No	Yes
expr	Yes	Yes	Yes	No	Yes
false	Yes	Yes	Yes	Yes	Yes
fgrep	Yes	Yes	Yes	Yes	Yes
file	Yes	Yes	Yes	No	Yes
find	Yes	Yes	Yes	No	Yes
fmt	Yes	Yes	Yes	No	Yes
fold	Yes	Yes	Yes	No	Yes
ftp	No	Yes	Yes	No	No
gawk	No	Yes	Yes	No	No
grep	Yes	Yes	Yes	Yes	Yes
groups	Yes	Yes	Yes	No	Yes
gzip	No	Yes	Yes	No	Yes
head	Yes	Yes	Yes	No	Yes
id	Yes	Yes	Yes	No	Yes
ifconfig	No	Yes	Yes	No	No
join	Yes	Yes	Yes	No	Yes
kill	Yes	Yes	Yes	Yes	Yes
ksh	Yes	Yes	Yes	No	No
less	No	Yes	Yes	No	No
ln	Yes	Yes	Yes	No	Yes
ls	Yes	Yes	Yes	Yes	Yes
make	No	Yes	Yes	No	No
man	No	Yes	Yes	No	Yes
mkdir	Yes	Yes	Yes	Yes	Yes
more	No	Yes	Yes	No	Yes
mv	Yes	Yes	Yes	Yes	Yes
nc	No	Yes	Yes	No	No
netstat	No	Yes	Yes	No	No
nice	Yes	Yes	Yes	No	Yes
nl	Yes	Yes	Yes	No	Yes
nm	No	Yes	Yes	No	No
nohup	Yes	Yes	Yes	No	Yes
od	Yes	Yes	Yes	No	Yes
passwd	No	Yes	Yes	No	No
paste	Yes	Yes	Yes	No	Yes
patch	No	Yes	Yes	No	No
pathchk	Yes	Yes	Yes	No	Yes
pax	Yes	Yes	Yes	No	Yes
ping	No	Yes	Yes	No	No
pr	Yes	Yes	Yes	No	Yes
printenv	Yes	Yes	Yes	No	Yes
printf	Yes	Yes	Yes	Yes	Yes
ps	Yes	Yes	Yes	Yes	Yes
pwd	Yes	Yes	Yes	Yes	Yes
rcp	No	Yes	Yes	No	No
rm	Yes	Yes	Yes	Yes	Yes
rmdir	Yes	Yes	Yes	Yes	Yes
scp	No	Yes	Yes	Yes	No
sed	Yes	Yes	Yes	No	Yes
seq	No	No	Yes	No	No
sftp	No	Yes	Yes	Yes	No
sh	Yes	Yes	Yes	Yes	Yes
sleep	Yes	Yes	Yes	Yes	Yes
sort	Yes	Yes	Yes	No	Yes
split	Yes	Yes	Yes	No	Yes
ssh	No	Yes	Yes	Yes	No
stat	No	Yes	Yes	No	No
su	No	Yes	Yes	No	No
sudo	No	Yes	Yes	No	No
sum	Yes	Yes	Yes	No	Yes
sync	Yes	Yes	Yes	No	Yes
tac	No	No	Yes	No	No
tail	Yes	Yes	Yes	No	Yes
tar	No	Yes	Yes	No	Yes
tee	Yes	Yes	Yes	No	Yes
telnet	No	Yes	Yes	No	No
test	Yes	Yes	Yes	Yes	Yes
time	No	Yes	Yes	No	No
timeout	No	No	Yes	No	No
top	No	Yes	Yes	No	No
touch	Yes	Yes	Yes	No	Yes
tr	Yes	Yes	Yes	No	Yes
traceroute	No	Yes	Yes	No	No
true	Yes	Yes	Yes	Yes	Yes
tsort	Yes	Yes	Yes	No	Yes
tty	Yes	Yes	Yes	No	Yes
umask	Yes	Yes	Yes	Yes	Yes
uname	Yes	Yes	Yes	Yes	Yes
uniq	Yes	Yes	Yes	No	Yes
unlink	Yes	Yes	Yes	No	Yes
unexpand	Yes	Yes	Yes	No	Yes
uniq	Yes	Yes	Yes	No	Yes
uptime	No	Yes	Yes	No	No
users	Yes	Yes	Yes	No	Yes
vmstat	No	Yes	Yes	No	No
wc	Yes	Yes	Yes	No	Yes
wget	No	Yes	Yes	No	No
which	No	Yes	Yes	No	Yes
who	Yes	Yes	Yes	No	Yes
whoami	Yes	Yes	Yes	No	Yes
xargs	Yes	Yes	Yes	No	Yes
yes	Yes	Yes	Yes	Yes	Yes
zip	No	Yes	Yes	No	No

Alternate structure

Utility	POSIX Standard	GNU Core	BSD Core	OpenBSD	Alpine Linux	Linux Standard Base (LSB)
awk	Yes	Yes	Yes	Yes	Yes	Yes
sed	Yes	Yes	Yes	Yes	Yes	Yes
grep	Yes	Yes	Yes	Yes	Yes	Yes
tar	Yes	Yes	Yes	Yes	Yes	Yes
ssh	No	Yes	Yes	Yes	Yes	No
scp	No	Yes	Yes	Yes	Yes	No
curl	No	Yes	Yes	Yes	Yes	No
wget	No	Yes	Yes	Yes	Yes	No
make	Yes	Yes	Yes	Yes	Yes	Yes
gcc	No	Yes	Yes	Yes	Yes	No
vim	No	Yes	Yes	Yes	Yes	No
nano	No	Yes	Yes	Yes	Yes	No
tmux	No	Yes	Yes	Yes	Yes	No
git	No	Yes	Yes	Yes	Yes	No

Key Observations:

POSIX Standard: This column indicates if the utility is part of the POSIX standard, which seeks to ensure interoperability across UNIX-like systems.
GNU/Linux: A general indication of availability across GNU/Linux distributions. Specific availability might vary among distributions.
FreeBSD and OpenBSD: These columns show whether the utility is typically available by default in these BSD variants.
Alpine Linux: Reflects the utility's availability in Alpine Linux, highlighting its inclusion in a distribution known for a minimalistic approach.
Linux Standard Base (LSB): Identifies if the utility is required by the LSB specifications to ensure a certain level of compatibility across Linux distributions.

Everything is a file, the book.

C. Comparison of POSIX, GNU, and BSD utility programs

POSIX, BSD, GNU, and Linux Standard Base Utilities