terryoy

# convert text files to all lower case
$ tr '[:upper:]' '[:lower:]' < input.txt > output.txt
 
# Convert Data Stored in a Shell Variable From UPPPER to lowercase
$ echo $VAR_NAME | tr '[:upper:]' '[:lower:]'
# Convert Data Stored in a Shell Variable From lowercase to UPPER
$ echo $VAR_NAME | tr '[:lower:]' '[:upper:]'

# job control:
# ctrl+z - suspend a job and put into background

terryoy

# install virtualenv to manage the environment
sudo apt-get install python-virtualenv

# create site folder
mkdir mysite
cd mysite

# activatet the virtualenv environment
virtualenv venv
source venv/bin/activate