List of Basic Shell Commands everyone should know of

bash

pwd
hostname
mkdir
cd
cp 
mv 
less
cat
xargs
find
grep
man
env
echo 
export
exit
chmod
chown
alias
apt-get ( Linux) 
port / brew ( Mac) 
bash
bc
bzip
cal
cksum
cmp
date
diff
df
dig
du 
eject
format
free
fsck
ftp 
gzip
head
history 
ifconfig
kill
ln 
locate
ls
netstat
nice
nslookup
passwd
popd
pushd
quota
rm 
rsync
screen
scp 
sdiff
stfp
ssh
touch
top
uptime
whereis
which
wget
!!