config

commit 9078f756768e04a0f379d367b5e5560ce11e47cc
parent c81bde1dd43a6e732e9266a4d19c1557dff2e1a1
Author: Jacob R. Edwards <n/a>
Date:   Sat,  3 Dec 2022 12:00:24 -0600

Add notin, a script to show lines not in files

This useful little script is pretty simple; it reads the lines from
the standard input and removes them as it comes across them in the
given files finally printing whichever remain at the end.

Diffstat:
A
local/bin/bin/notin
 | 
35
+++++++++++++++++++++++++++++++++++

1 file changed, 35 insertions(+), 0 deletions(-)
diff --git a/local/bin/bin/notin b/local/bin/bin/notin
@@ -0,0 +1,35 @@
+#!/usr/bin/awk -f
+# Copyright 2022 Jacob R. Edwards
+# Only print lines from stdin that don't appear in the given files
+
+BEGIN {
+	if (ARGC <= 1) {
+		error = "usage: notin file [...]"
+		exit
+	}
+	while ((s = getline line < "/dev/stdin" > 0)) {
+		arr[++i] = line; 
+		map[line] = i;
+	}
+	if (s < 0) {
+		error = "Unable to read from stdin"
+		exit
+	}
+}
+
+{
+	if ($0 in map) {
+		delete arr[map[$0]]
+		delete map[$0]
+	}
+}
+
+END {
+	if (error) {
+		print error > "/dev/stderr"
+		exit 1
+	}
+	for (i = 1; i <= length(arr); ++i) {
+		if (arr[i] in map)
+			print arr[i]; }
+}