Find count of code lines in Clojure source files

gistfile1.sh

# Find count of code lines in Clojure source files
  cat file.clj | grep -e '^$' -e '^;' -v | wc -l

# How it works?
#
# cat file.clj                                         view file with cat command
#              |                                       pipe the output of cat command to the following commands
#                grep                                  read the input (piped cat) and match it to given regular expressions
#                     -e '^$'                          look for line start (^) followed by immediate end ($) -> empty line
#                             -e '^;'                  look for line start (^) followed by Clojure comment mark (;)
#                                     -v               invert all the matches to get the actual code instead of comment or empty lines
#                                        | wc -l       pipe the matched lines to wc command to count the lines (-l) option
#
# The command prints out an integer of counted lines
#
# Here we assume the comments always start from the very beginning of the line.
# This can be fixed by rewriting the second expression as
#
# -e '^\s*;'
#
# Here we are using \s* as an optional whitespace match (\s) matched 0 or more times (*)
# The whitespace fixed version is this

cat file.clj | grep -e '^$' -e '^\s*;' -v | wc -l