Terminal does not wrap properly in linux

Sometimes lines don't wrap correctly in a bash terminal in linux - long lines overlap and overwrite the beginning of the line instead of continuing onto the next line.

To fix it:
shopt -s checkwinsize

To check it:
shopt  | grep checkwinsize
You should see:
checkwinsize    on

If it still isn't working, try:
reset

(source)

Split one long line into shorter lines

Command:

fold file_with_long_lines.txt

...prints to STDOUT

(source)