GAWK: Effective AWK Programming

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236 GAWK: Effective AWK ProgrammingIf there are no fields left after removing all the punctuation, the current record is skipped.Otherwise, the program loops through each word, comparing it to the previous one:# dupword.awk --- find duplicate words in text{$0 = tolower($0)gsub(/[^[:alnum:][:blank:]]/, " ");$0 = $0 # re-splitif (NF == 0)nextif ($1 == prev)printf("%s:%d: duplicate %s\n",FILENAME, FNR, $1)for (i = 2; i
Chapter 13: Practical awk Programs 237print usage1 > "/dev/stderr"print usage2 > "/dev/stderr"exit 1} else if (ARGC == 5) {delay = ARGV[4] + 0count = ARGV[3] + 0message = ARGV[2]} else if (ARGC == 4) {count = ARGV[3] + 0message = ARGV[2]} else if (ARGC == 3) {message = ARGV[2]} else if (ARGV[1] !~ /[0-9]?[0-9]:[0-9][0-9]/) {print usage1 > "/dev/stderr"print usage2 > "/dev/stderr"exit 1}# set defaults for once we reach the desired timeif (delay == 0)delay = 180 # 3 minutesif (count == 0)count = 5if (message == "")message = sprintf("\aIt is now %s!\a", ARGV[1])else if (index(message, "\a") == 0)message = "\a" message "\a"The next section of code turns the alarm time into hours and minutes, converts it (ifnecessary) to a 24-hour clock, and then turns that time into a count of the seconds sincemidnight. Next it turns the current time into a count of seconds since midnight. Thedifference between the two is how long to wait before setting off the alarm:# split up alarm timesplit(ARGV[1], atime, ":")hour = atime[1] + 0 # force numericminute = atime[2] + 0 # force numeric# get current broken down timegettimeofday(now)# if time given is 12-hour hours and it’s after that# hour, e.g., ‘alarm 5:30’ at 9 a.m. means 5:30 p.m.,# then add 12 to real hourif (hour < 12 && now["hour"] > hour)hour += 12# set target time in seconds since midnight
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