From 8fbe044c93bcfd49863ce8c7c472d083753f19ff Mon Sep 17 00:00:00 2001
From: kremlin <ian@kremlin.cc>
Date: Mon, 15 Sep 2014 19:52:48 -0400
Subject: [PATCH] needs a gross regex for param + numerical checking

---
 assgn3/process-pid.sh | 18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)

diff --git a/assgn3/process-pid.sh b/assgn3/process-pid.sh
index 0676b8b..daa6624 100755
--- a/assgn3/process-pid.sh
+++ b/assgn3/process-pid.sh
@@ -1,6 +1,18 @@
 #!/usr/bin/env bash
 
-if [ -z "$1" ] || [ "$1" = "-h" ] ; then
-	echo "usage: ./process-pid.sh [command] [pid]"
-	exit 1;
+USAGE="usage: ./process-pid.sh {[-h, -a], [-f, -e] <pid>}, -s <regexp>"
+
+if [ -z "$1" ]; then
+	echo "$USAGE"; exit 1
+
+elif [[ "$1" =~ ^-?[0-9]+$ ]]; then # unportable :(
+	if `ps $1 > /dev/null 2>&1`; then
+		echo "you win!"; exit 0
+
+	else
+		echo -ne "invalid pid\n$USAGE"; exit 1
+	fi
+
+elif [[ "$1" -eq "-h" ]]; then
+	echo "$USAGE"; exit 0 
 fi
-- 
2.41.0