maybe worth looking at first sentence of man page

useful.txt

[
2to3
apt
ar
arch
as
at
atq
atrm
awk
bat
batch
byobu
c++
c2ph
c89
c99
cal
cc
cdiff
chacl
chage
chcon
chfn
chrt
chsh
cksum
clear
cmp
col
col1
col2
col3
col4
col5
col6
col7
col8
col9
colrm
comm
cpan
cpp
cpp-5
ctail
curl
cut
derb
diff
diff3
dig
dpkg
du
dwp
edit
eject
env
eqn
erb
ex
expr
file
find
flock
fmt
fold
free
from
ftp
g++
g++-5
gawk
gcc
gcc-5
gcov
gdbus
gem
genrb
geqn
git
go
gofmt
gold
gpg
gpgv
gpic
gprof
groff
grog
grops
gs
gsbj
gsdj
gslj
gslp
gsnd
gtbl
h2ph
h2xs
hd
head
hexyl
host
htop
i386
iconv
id
idlj
igawk
info
ipcmk
ipcrm
ipcs
irb
jar
java
javac
javah
javap
jcmd
jdb
jdeps
jexec
jhat
jinfo
jjs
jmap
join
jps
js
jstat
jwt3
last
lastb
lcf
ld
ldd
less
line
link
look
lscpu
lshw
lsipc
lsof
lspci
lsusb
lxc
lxcfs
lxd
lzcat
lzcmp
lzma
make
man
mandb
mawk
mesg
mtr
namei
nawk
ncal
neqn
NF
nice
nl
nm
no
node
nohup
nproc
nroff
nstat
od
orbd
pager
partx
paste
patch
pbget
pbput
pdb
pdb3
perl
pftp
pg
pgrep
pic
pico
pinky
pip
pip2
pkill
pl2pm
pldd
pmap
pphs
ppm3d
ppmtv
pr
print
prove
ps2ps
ptar
ptx
pwdx
pydoc
rake
rcp
rdoc
reset
rev
rgrep
ri
ri2.3
rmic
rmid
rsh
rsync
ruby
rview
rvim
scp
sdiff
see
seq
sftp
sg
shred
shuf
size
skill
snap
snice
sort
split
sprof
ssh
stat
strip
sudo
sum
tabs
tac
tail
tbl
tee
test
tic
time
tload
tmux
toe
top
touch
tput
tr
tree
troff
tset
tsort
tty
ucf
ucfq
ucfr
uconv
ul
uniq
unxz
unzip
users
vi
view
vigpg
vim
w
wall
watch
wc
wget
which
who
write
wsgen
X11
xargs
xauth
xjc
xxd
xz
xzcat
xzcmp
yes
yesnt
zdump
zip