#!/bin/sh
# vim: ft=sh ts=4 sw=4 et
#
# This script, when invoked with a number (representing a line length)
# and a list of filenames, will look for lines longer than the given length
# in each of the listed files. When it finds such a line, it prints
#
# - the name of the file,
# - line number within that file, and
# - the length of that line.
#

case "$#" in
    0)
        echo "usage: find_long_lines limit_length filename1 ..."
        exit 1
        ;;
    *)
        LIMIT_LEN="$1"
        export LIMIT_LEN
        shift
        ;;
esac

awk "
BEGIN {
        limit_len = ${LIMIT_LEN};
        CUR_FILENAME = \"\";
        line_number = 0;
    }
    {
        if (FILENAME != CUR_FILENAME) {
            CUR_FILENAME = FILENAME;
            line_number = 0;
        }
        ++line_number;
        len = length(\$0);
        if (len > limit_len + 0) {
            printf \"%s:%d: %d\n\", FILENAME, line_number, len;
        }
    }" "$@"