Quick SLoC counter in CLI

sloc.sh

# Counts source lines of code in current directory. Replace *.java with your source extension.
# (ignores empty lines)

find . -type f -name '*.java' -exec cat {} \; | sed '/^\s*$/d' | wc -l

# to ignore comments (in languages where comments start with #)

find . -type f -name '*.java' -exec cat {} \; | sed '/^\s*#/d;/^\s*$/d' | wc -l

In most package managers (apt, brew etc) there is sloccount package. It gives detailed stats, you better use it.