add a new bash diff with tolerance

Author: meihuisu

utilities/ucvm_query_diff.sh

@@ -0,0 +1,48 @@
+#!/usr/bin/env bash
+# suggested by chatgpt
+# ucvm_query_diff.sh fileA fileB
+
+file1="$1"
+file2="$2"
+tol=0.001   # change tolerance here
+
+awk -v tol="$tol" '
+NR==FNR {
+    lines1[NR]=$0
+    next
+}
+{
+    if (!(FNR in lines1)) {
+        print "Line count differs"
+        exit 1
+    }
+
+    n1 = split(lines1[FNR], a)
+    n2 = split($0, b)
+
+    if (n1 != n2) {
+        printf("Line %d: different number of columns\n", FNR)
+        next
+    }
+
+    for (i=1; i<=n1; i++) {
+        if (a[i] == b[i]) continue
+
+        # check if both are numeric
+        if (a[i] ~ /^-?[0-9.]+$/ && b[i] ~ /^-?[0-9.]+$/) {
+            diff = a[i] - b[i]
+            if (diff < 0) diff = -diff
+            if (diff > tol) {
+                printf("Line %d, Col %d: %s != %s\n", FNR, i, a[i], b[i])
+            }
+        } else {
+            printf("Line %d, Col %d: %s != %s\n", FNR, i, a[i], b[i])
+        }
+    }
+}
+END {
+    if (NR != length(lines1)) {
+        print "Line count differs"
+    }
+}
+' "$file1" "$file2"