GAWK: Effective AWK Programming

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220 GAWK: Effective AWK Programmingthat should be printed. The corresponding field is printed if it contains data. If the nextfield also has data, then the separator character is written out between the fields:{}if (by_fields && suppress && index($0, FS) != 0)nextfor (i = 1; i
Chapter 13: Practical awk Programs 221This version uses the getopt library function (see Section 12.4 [Processing Command-Line Options], page 201) and the file transition library program (see Section 12.3.1 [NotingData File Boundaries], page 197).The program begins with a descriptive comment and then a BEGIN rule that processesthe command-line arguments with getopt. The ‘-i’ (ignore case) option is particularly easywith gawk; we just use the IGNORECASE built-in variable (see Section 6.5 [Built-in Variables],page 110):# egrep.awk --- simulate egrep in awk# Options:# -c count of lines# -s silent - use exit value# -v invert test, success if no match# -i ignore case# -l print filenames only# -e argument is pattern## Requires getopt and file transition library functionsBEGIN {while ((c = getopt(ARGC, ARGV, "ce:svil")) != -1) {if (c == "c")count_only++else if (c == "s")no_print++else if (c == "v")invert++else if (c == "i")IGNORECASE = 1else if (c == "l")filenames_only++else if (c == "e")pattern = Optargelseusage()}Next comes the code that handles the egrep-specific behavior. If no pattern is suppliedwith ‘-e’, the first nonoption on the command line is used. The awk command-line argumentsup to ARGV[Optind] are cleared, so that awk won’t try to process them as files. Ifno files are specified, the standard input is used, and if multiple files are specified, we makesure to note this so that the file names can precede the matched lines in the output:if (pattern == "")pattern = ARGV[Optind++]for (i = 1; i < Optind; i++)ARGV[i] = ""if (Optind >= ARGC) {
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