linecounter.sh

# Counts lines from all files in this directory and below it
# Ignores hidden files (to make it include hidden files, change
# the * wildcard to a .
line_ctr=0; for file in `find * -type f`; do echo $file `cat $file | wc -l`; line_ctr=$line_ctr+`cat $file | wc -l`; done; echo $((line_ctr))

$((line_ctr)) is used to evaluate the string n+n+n+n+n