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ls

doc -l prints -rw-r--r--    1 hakw    14 Jan 24 18:40 foo.sh -a shows hidden files

ll is an alias for ls -al

source

source ./foo.sh is the same as . ./foo.sh.

ensures that the virtual environment’s variables are set within the current shell, and not in a subprocess (which then disappears, having no useful effect).

cd $(mktemp -d)
echo "export FOOO=1" >> foo.sh
chmod +x foo.sh
./foo.sh
echo $FOOO # prints nothing, var FOOO disappears after the sunprocess returns.
cd $(mktemp -d)
echo "export FOOO=1" >> foo.sh
chmod +x foo.sh
source ./foo.sh
echo $FOOO # prints 1, source command sets the var FOOO

mktemp

mktemp creates a temp file -d creates a temp directory

chmod

+x makes file executable