#### Lesson 1
OS'es
UNIX: history and flavors
Filesystem hierarchy
Absolute and relative paths
Users
Streams: standard input/output/error

date
echo
ls
mkdir
touch
cp
mv
rm
rmdir
pwd
cd
cat
grep


#### Lesson 2
Disk partitions and mounting
Shell globbing: * ? [] [-]
"cartesian" substitution {,}...
Environmental variables
Shell scripting

ln
at
cron
for
&& || ;


#### Lesson 3
Permissions
Regular expressions
Editors
Shells
alter PATH
prompt

random
chmod
chown
find
backticks
tree
tee
yes
paste
tr
ed
sed
awk
vim