1 files changed, 96 insertions, 0 deletions
diff --git a/awklib/eg/prog/egrep.awk b/awklib/eg/prog/egrep.awk
new file mode 100644
index 00000000..5a5ec988
--- /dev/null
+++ b/awklib/eg/prog/egrep.awk
@@ -0,0 +1,96 @@
+# egrep.awk --- simulate egrep in awk
+# Arnold Robbins, arnold@gnu.ai.mit.edu, Public Domain
+# May 1993
+
+# 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
+
+BEGIN {
+    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 = 1
+        else if (c == "l")
+            filenames_only++
+        else if (c == "e")
+            pattern = Optarg
+        else
+            usage()
+    }
+    if (pattern == "")
+        pattern = ARGV[Optind++]
+
+    for (i = 1; i < Optind; i++)
+        ARGV[i] = ""
+    if (Optind >= ARGC) {
+        ARGV[1] = "-"
+        ARGC = 2
+    } else if (ARGC - Optind > 1)
+        do_filenames++
+
+#    if (IGNORECASE)
+#        pattern = tolower(pattern)
+}
+#{
+#    if (IGNORECASE)
+#        $0 = tolower($0)
+#}
+function beginfile(junk)
+{
+    fcount = 0
+}
+function endfile(file)
+{
+    if (! no_print && count_only)
+        if (do_filenames)
+            print file ":" fcount
+        else
+            print fcount
+
+    total += fcount
+}
+{
+    matches = ($0 ~ pattern)
+    if (invert)
+        matches = ! matches
+
+    fcount += matches    # 1 or 0
+
+    if (! matches)
+        next
+
+    if (no_print && ! count_only)
+        nextfile
+
+    if (filenames_only && ! count_only) {
+        print FILENAME
+        nextfile
+    }
+
+    if (do_filenames && ! count_only)
+        print FILENAME ":" $0
+    else if (! count_only)
+        print
+}
+END    \
+{
+    if (total == 0)
+        exit 1
+    exit 0
+}
+function usage(    e)
+{
+    e = "Usage: egrep [-csvil] [-e pat] [files ...]"
+    print e > "/dev/stderr"
+    exit 1
+}