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-rw-r--r--examples/functions/isvalidip14
1 files changed, 14 insertions, 0 deletions
diff --git a/examples/functions/isvalidip b/examples/functions/isvalidip
new file mode 100644
index 0000000..0b2dafe
--- /dev/null
+++ b/examples/functions/isvalidip
@@ -0,0 +1,14 @@
+# Thanks to Chris F. A. Johnson <c.f.a.johnson@rogers.com> for this one
+is_validip()
+{
+ case "$*" in
+ ""|*[!0-9.]*|*[!0-9]) return 1 ;;
+ esac
+
+ local IFS=.
+ set -- $*
+
+ [ $# -eq 4 ] &&
+ [ ${1:-666} -le 255 ] && [ ${2:-666} -le 255 ] &&
+ [ ${3:-666} -le 255 ] && [ ${4:-666} -le 254 ]
+}