SHell

Present on all linux platforms, and more minimalist than bash.

Options

List options for shell: set -o

Note: usefull to disable history, or enable errexit, notify, etc...

To set variable: set +o variableName

To unset variable: set -o variableName

See also SHOPT (official doc)

Usefull example of shopt: shopt -s cdspell

So now if you type:

cd /Etc # or cd /etccccc

You will ending in /etc directory

Hello Summary

# conditions 
if test 5 -ge 0; then
  echo "positive" # positive
else
  echo "negative"
fi