115 lines
2.4 KiB
Awk
115 lines
2.4 KiB
Awk
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# egrep.awk --- simulate egrep in awk
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#
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# Arnold Robbins, arnold@skeeve.com, Public Domain
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# May 1993
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# Revised September 2020
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# Options:
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# -c count of lines
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# -e argument is pattern
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# -i ignore case
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# -l print filenames only
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# -n add line number to output
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# -q quiet - use exit value
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# -s silent - don't print errors
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# -v invert test, success if no match
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# -x the entire line must match
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#
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# Requires getopt library function
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# Uses IGNORECASE, BEGINFILE and ENDFILE
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# Invoke using gawk -f egrep.awk -- options ...
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BEGIN {
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while ((c = getopt(ARGC, ARGV, "ce:ilnqsvx")) != -1) {
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if (c == "c")
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count_only++
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else if (c == "e")
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pattern = Optarg
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else if (c == "i")
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IGNORECASE = 1
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else if (c == "l")
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filenames_only++
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else if (c == "n")
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line_numbers++
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else if (c == "q")
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no_print++
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else if (c == "s")
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no_errors++
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else if (c == "v")
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invert++
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else if (c == "x")
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full_line++
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else
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usage()
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}
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if (pattern == "")
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pattern = ARGV[Optind++]
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if (pattern == "")
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usage()
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for (i = 1; i < Optind; i++)
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ARGV[i] = ""
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if (Optind >= ARGC) {
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ARGV[1] = "-"
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ARGC = 2
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} else if (ARGC - Optind > 1)
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do_filenames++
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}
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BEGINFILE {
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fcount = 0
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if (ERRNO && no_errors)
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nextfile
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}
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ENDFILE {
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if (! no_print && count_only) {
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if (do_filenames)
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print file ":" fcount
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else
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print fcount
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}
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total += fcount
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}
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{
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matches = match($0, pattern)
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if (matches && full_line && (RSTART != 1 || RLENGTH != length()))
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matches = 0
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if (invert)
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matches = ! matches
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fcount += matches # 1 or 0
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if (! matches)
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next
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if (! count_only) {
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if (no_print)
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nextfile
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if (filenames_only) {
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print FILENAME
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nextfile
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}
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if (do_filenames)
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if (line_numbers)
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print FILENAME ":" FNR ":" $0
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else
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print FILENAME ":" $0
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else
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print
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}
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}
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END {
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exit (total == 0)
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}
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function usage()
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{
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print("Usage:\tegrep [-cilnqsvx] [-e pat] [files ...]") > "/dev/stderr"
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print("\tegrep [-cilnqsvx] pat [files ...]") > "/dev/stderr"
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exit 1
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}
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