diff --git a/EOPSY/task1/.modify.sh.swp b/EOPSY/task1/.modify.sh.swp
new file mode 100644
index 00000000..124be954
Binary files /dev/null and b/EOPSY/task1/.modify.sh.swp differ
diff --git a/EOPSY/task1/modify.sh b/EOPSY/task1/modify.sh
index 8ffe3757..da0e664b 100755
--- a/EOPSY/task1/modify.sh
+++ b/EOPSY/task1/modify.sh
@@ -1,20 +1,186 @@
 #!/bin/bash
+# command options and arguments interpreter example
+# simple version
 
-# Function to detect -h flag and show help for this script
-show_help() {
-	local OPTIND 
-	while getopts ":h" opt ; do
-		case "$opt" in 
-			h )
-			       	echo "This script modifies file names"
-			  	echo "-l lowerize file names"
-			  	echo "-u uppercase file names"
-			  	echo "-r recurse into directory"
-			  	echo "[-r] <sed pattern> specify sed pattern that will be executed on file names"
-			  	echo "-h show this help information"
-				;;
-	  esac
-	done	
+# the name of the script without a path
+name=`basename $0`
+
+help()
+{
+	echo "-l <dir/file names...> -> lowerize file/folder name"
+	echo "-u <dir/file names...> -> uppercase file/folder name"
+	echo "-r [-l|u] -> lowerize or uppercase file/folder name recursively"
+	echo "<sed pattern> <dir/file names...> -> call sed command operating on file/folder name"
+	echo "-r <sed pattern> <dir/file names...> -> call sed command operating on file/folder recursively"
+	echo "-h -> display this message"
 }
 
-show_help "$@"
+
+
+
+uppercase()
+{
+
+        if test -z "$1"
+        then
+                error_msg "missing filename for -u"
+                exit 1
+        fi
+	mv "$1" $(echo "$1" | sed -r -e 's/.*/\U&/');
+
+		
+
+}
+
+lowercase()
+{
+	if test -z "$1"
+	then
+		error_msg "missing filename for -l"
+		exit 1
+	fi
+	if test -f "$1"
+	then
+		if test -d "$1"
+		then
+			error_msg "$1 is neither a file nor the folder"
+			exit 2
+		fi
+	fi
+	mv "$1" $(echo "$1" | sed -r -e 's/.*/\L&/');
+}
+
+sneed()
+{
+	if test -z "$1"
+	then
+		error_msg "missing sed pattern"
+		exit 1
+	fi
+	if test -z "$2"
+	then
+		error_msg "missing sed filename"
+		exit 2
+	fi
+	echo "$1"
+	echo $1
+	mv "$2" $(echo "$2" | sed $1)
+}
+
+recursionSneed()
+{
+	if test -z "$1"
+	then
+		error_msg "missing sed pattern"
+		exit 1
+	fi
+
+	if test -z "$2"
+	then
+		error_msg "missing sed filename"
+		exit 2
+	fi
+	
+	if test -d "$2"
+        then
+        sneed "$1" "$2"
+        cd "$2"
+        for file in *
+        do
+                recursionSneed "$1" "$file"
+        done
+        fi
+
+        if test -f "$2"
+        then
+        sneed "$1" "$2"
+        fi
+
+
+
+}
+
+recursionLowercase()
+{
+	lowercase "$1"
+	set "$(echo "$1" | sed -r -e 's/.*/\L&/')"
+	for item in "$1"/* 
+	do
+		if test -d "$item"
+		then
+			recursionLowercase "$item"
+		fi
+		if test -f "$item"
+		then
+			lowercase "$item"
+		fi
+	done
+}
+
+recursionUppercase()
+{
+	uppercase "$1"
+        set "$(echo "$1" | sed -r -e 's/.*/\L&/')"
+        for item in "$1"/*
+        do
+                if test -d "$item"
+                then
+                        recursionUppercase "$item"
+                fi
+                if test -f "$item"
+                then
+                        uppercase "$item"
+                fi
+        done
+
+}
+
+recursion()
+{
+	if test -z "$1"
+	then
+		error_msg "missing argument for -r"
+		exit 1
+	fi
+	
+       	case "$1" in
+		-l|--lowercase) recursionLowercase "$2";;
+       	        -u|--uppercase) recursionUppercase "$2";;
+               	*) recursionSneed "$1" "$2";;
+	esac
+}
+
+
+
+# function for printing error messages to diagnostic output
+error_msg() 
+{ 
+        echo "$name: error: $1" 1>&2 
+}
+
+# function for servicing -w option
+
+
+# if no arguments given
+if test -z "$1"
+then
+	help
+fi
+
+
+# do with command line arguments
+while test "x$1" != "x"
+do
+        case "$1" in
+                -h|--help) help;;
+                -l|--lowercase) lowercase "$2";;
+		-r|--recursion) recursion "$2" "$3" ;;
+		-u|--upercase) uppercase "$2";;
+		*) sneed "$1" "$2" ;;
+        esac
+        shift
+done
+
+
+
+