From aa363c849ccb2e3b5346eac9cc3631b0a0c13119 Mon Sep 17 00:00:00 2001
From: kremlin <ian@kremlin.cc>
Date: Thu, 18 Sep 2014 16:42:35 -0400
Subject: [PATCH] rewrote with getopts, done

---
 assgn3/process-pid.sh | 96 +++++++++++++++++++++++++++++++------------
 1 file changed, 69 insertions(+), 27 deletions(-)

diff --git a/assgn3/process-pid.sh b/assgn3/process-pid.sh
index 3837503..30d57c7 100755
--- a/assgn3/process-pid.sh
+++ b/assgn3/process-pid.sh
@@ -1,36 +1,78 @@
 #!/usr/bin/env bash
 
-USAGE="usage: ./process-pid.sh {[-h, -a], [-f, -e] <pid>}, -s <regexp>"
+USAGE="usage: $0 <pid> [-h, -a] [-f, -e] [-s <regexp>]"
+OPTIND=2
 
-# -h case
-if [[ "$1" -eq "-h" ]]; then
-	echo "$USAGE"; exit 0 
+if [[ ! "$1" =~ ^-?[0-9]+$ ]]; then
+	echo $USAGE; exit 1
 
-# <pid> case
-elif [[ "$1" =~ ^-?[0-9]+$ ]]; then
-	if `ps $1 > /dev/null 2>&1`; then
-		echo "you win!"; exit 0
+elif [[ ! -d /proc/$1 ]]; then
+	echo "invalid pid '$1'"; exit 1
+fi
 
-	else
-		echo -ne "invalid pid\n$USAGE"; exit 1
-	fi
+echo -e "pid '${1}' refers to a running process.\n"
 
-# -e <pid> case
-elif [[ "$1" -eq "-e" && "$2" =~ ^-?[0-9]+$ ]]; then
-	if `ps $2 > /dev/null 2>&1`; then
-		echo "you win!"; exit 0;
+while getopts ":s:hafe" opts; do
+	case "${opts}" in
+		s)
+		  cat /proc/"$1"/status | grep "$OPTARG"
+		  ;;
+		h) 
+		  echo "$USAGE"; DROPBOOL=1
+		  ;;
+		a)
+		  echo "written by ian sutton."; if [[ $DROPBOOL ]]; then exit 0; fi
+		  ;;
+		f)
+		  ls /proc/"$1"
+		  ;;
+		e)
+		  if [[ ! `readlink /proc/$1/exe` ]]; then
+			echo "no permissions to read pid '$1's executable path"; exit 1
+		  fi
 
-	else
-		echo -ne "invalid pid\n$USAGE"; exit 1
+		  echo -n "executable path of pid '$1': "
+		  readlink /proc/"$1"/exe
+		  ;;
+		\?)
+		  echo "bad option \"-$OPTARG\""; exit 1
+		  ;;
+		:)
+		  echo $USAGE; exit 1
+		  ;;
+	esac
+	echo -ne "\n"
+done
 
+# -h case
+#if [[ "$1" -eq "-h" ]]; then
+#	echo "$USAGE"; exit 0 
+#
+# <pid> case
+#elif [[ "$1" =~ ^-?[0-9]+$ ]]; then
+#	if `ps $1 > /dev/null 2>&1`; then
+#		echo "you win!"; exit 0
+#
+#	else
+#		echo -ne "invalid pid\n$USAGE"; exit 1
+#	fi
+#
+# -e <pid> case
+#elif [[ "$1" -eq "-e" && "$2" =~ ^-?[0-9]+$ ]]; then
+#	if `ps $2 > /dev/null 2>&1`; then
+#		echo "you win!"; exit 0;
+#
+#	else
+#		echo -ne "invalid pid\n$USAGE"; exit 1
+#
 # -s <pid> <regex> case
-elif [[ "$1" -eq "-s" && "$2" =~ ^-?[0-9]+$ ]]; then
-	if `ps $2 > /dev/null 2>&1`; then
-		echo "you win!"; exit 0;
-
-	else
-		echo -ne "invalid pid\n$USAGE"; exit 1
-
-else
-	echo "$USAGE"; exit 1
-fi
+#elif [[ "$1" -eq "-s" && "$2" =~ ^-?[0-9]+$ ]]; then
+#	if `ps $2 > /dev/null 2>&1`; then
+#		echo "you win!"; exit 0;
+#
+#	else
+#		echo -ne "invalid pid\n$USAGE"; exit 1
+#
+#else
+#	echo "$USAGE"; exit 1
+#fi
-- 
2.41.0