switch from old `let` to newer `: $((...))` syntax

Signed-off-by: Mike Frysinger <vapier@gentoo.org>

1 files changed, 6 insertions, 6 deletions

diff --git a/build-docbook-catalog b/build-docbook-catalog
index 6950f3e..669cbf8 100755
--- a/build-docbook-catalog
+++ b/build-docbook-catalog
@@ -354,21 +354,21 @@ populate_entities() {
 	while [[ ${i} -lt ${#entities[@]} || ${j} -lt ${#avail[@]} ]]; do
 		if [[ ${i} -ge ${#entities[@]} ]]; then
 			echo "Warning: Extra ISO entities file: ${avail[j]}"
-			let j=j+1
+			: $(( j += 1 ))
 		elif [[ ${j} -ge ${#avail[@]} ]]; then
 			echo "Warning: Entities file not found: ${entities[i]}"
-			let i=i+2
+			: $(( i += 2 ))
 		elif [[ ${avail[j]} < ${entities[i]} ]]; then
 			echo "Warning: Extra ISO entities file: ${avail[j]}"
-			let j=j+1
+			: $(( j += j + 1 ))
 		elif [[ ${entities[i]} < ${avail[j]} ]]; then
 			echo "Warning: Entities file not found: ${entities[i]}"
-			let i=i+2
+			: $(( i += i + 2 ))
 		elif [[ ${entities[i]} == ${avail[j]} ]]; then
 			xmlcatalog --noout --add "public" "${entities[i+1]}" \
 				"file://${isodir}/${entities[i]}" "${ROOT}${CATALOG}"
-			let j=j+1
-			let i=i+2
+			: $(( j += j + 1 ))
+			: $(( i += i + 2 ))
 		else
 			error "${0}: whoah, shouldn't be here"
 		fi