Rewrite up utility to be POSIX compliant

1 files changed, 11 insertions, 9 deletions

diff --git a/.local/bin/up b/.local/bin/up
index f771781..cdceaa2 100755
--- a/.local/bin/up
+++ b/.local/bin/up
@@ -1,12 +1,14 @@
-#!/usr/bin/env bash
+#! /usr/bin/env sh
 
-uptime=$(</proc/uptime)
-uptime=${uptime%%.*}
+main()
+{
+	seconds=$(awk -F. '{print $1}' < /proc/uptime)
 
-seconds=$(( uptime%60 ))
-minutes=$(( uptime/60%60 ))
-hours=$(( uptime/60/60%24 ))
-days=$(( uptime/60/60/24 ))
-
-echo "${days}d ${hours}h ${minutes}m ${seconds}s"
+	printf "%dd %02dh %02dm %02ds\n" \
+		"$(( seconds / 60 / 60 / 24 ))" \
+		"$(( seconds / 60 / 60 % 24 ))" \
+		"$(( seconds / 60 % 60 ))" \
+		"$(( seconds % 60 ))"
+}
 
+main "$@"