diff --git a/README.md b/README.md
index 2ad8d5a..22ca1c1 100644
--- a/README.md
+++ b/README.md
@@ -13,14 +13,8 @@ go [here](https://nanobot567.github.io/potscr)
 
 ### how to parse potatoscript
 
-* download the latest version of python from [the website](https://python.org/downloads/)
-* clone the latest version of potscr
-* open command prompt and change your directory to wherever you downloaded potscr-main to
-* type ```python potscr.py (potatoscript file path)```
-* your output will be showed in command prompt!
-
-### to-do
-
-- add an interactive shell
-- add more stuff to the cli
-- unlimited char numeric addition
\ No newline at end of file
+1. download the latest version of python from [the website](https://python.org/downloads/)
+2. clone the latest version of potscr
+3. open command prompt and change your directory to wherever you downloaded potscr-main to
+4. type ```python potscr.py (potatoscript file path)```
+5. your output will be showed in command prompt!
\ No newline at end of file
diff --git a/examples/long_script.potscr b/examples/long_script.potscr
new file mode 100644
index 0000000..c50af98
--- /dev/null
+++ b/examples/long_script.potscr
@@ -0,0 +1 @@
+~-Please type an integer: _%#%//-That integer plus, minus, times, and divided by 5: _/+%^`%`%^+%>%^&%&%^~
\ No newline at end of file
diff --git a/files/shell.py b/files/shell.py
new file mode 100644
index 0000000..6fa41e4
--- /dev/null
+++ b/files/shell.py
@@ -0,0 +1,128 @@
+from sys import stdout
+from time import sleep
+
+storednum = 0
+
+def shell():
+    global storednum
+    txtfound = ""
+    curnum = 0
+    lookinfortxt = ""
+    firstTime = True
+    stored = ""
+    shellver = 1.0
+
+    while True:
+        curnum = 0
+        shellIn = ""
+        if firstTime:
+            print(f"potscr shell v{shellver}\n")
+            print("type 'quit' to exit.")
+            firstTime = False
+
+        shellIn = input("> ")
+        if shellIn == "quit" or shellIn == "q" or shellIn == "bye" or shellIn == "exit":
+            exit()
+
+        # code in potscr.py starts here
+
+        def mathsomethin(type):
+            global storednum
+            try:
+                if shellIn[curnum+1] == "%":
+                    if shellIn[curnum+2].isnumeric():
+                        if type == "+":
+                            storednum += int(shellIn[curnum+2])
+                        elif type == "-":
+                            storednum -= int(shellIn[curnum+2])
+                        elif type == "*":
+                            storednum = storednum * int(shellIn[curnum+2])
+                        elif type == "/":
+                            storednum = storednum / int(shellIn[curnum+2])
+                    else:
+                        if type == "+":
+                            storednum += 5
+                        elif type == "-":
+                            storednum -= 5
+                        elif type == "*":
+                            storednum = storednum * 5
+                        elif type == "/":
+                            storednum = storednum / 5                
+            except IndexError:
+                if type == "+":
+                    storednum += 1
+                elif type == "-":
+                    storednum -= 1
+                elif type == "*":
+                    storednum = storednum * 1
+                elif type == "/":
+                    storednum = storednum / 1
+
+
+
+        for i in range(0,shellIn.__len__()):
+            char = shellIn[curnum]
+            if char == "-": # start of print
+                lookinfortxt = True
+            elif char == "_": # end of print
+                lookinfortxt = False
+                try:
+                    if shellIn[curnum+1] == "%": # percentage after means an alt version of the command, in this case no newline
+                        stdout.write(txtfound[1:])
+                        stdout.flush()
+                        txtfound = ""
+                    else:
+                        print(txtfound[1:])
+                        txtfound = ""
+                except IndexError:
+                    print(txtfound[1:])
+                    txtfound = ""
+            elif char == "#": # get input
+                temp = input()
+                try:
+                    if temp.isnumeric() and shellIn[curnum+1] == "%":
+                        storednum = int(temp)
+                    elif shellIn[curnum+1] == "%" and not temp.isnumeric():
+                        print("ERROR: Input must be an integer!")
+                        exit()
+                    else:
+                        stored = temp
+                except:
+                    stored = temp
+
+            elif char == "$": # print stored var
+                print(stored,end="")
+            elif char == "/": # newline
+                print("")
+            elif char == "*": # reset stored number
+                storednum = 0
+            elif char == "+": # number +
+                mathsomethin("+")
+            elif char == "`": # number -
+                mathsomethin("-")
+            elif char == ">": # number multiplied
+                mathsomethin("*")
+            elif char == "&": # number divided
+                mathsomethin("/")
+            elif char == "^": # print stored num
+                try:
+                    if shellIn[curnum+1] == "%":
+                        print(storednum,end="")
+                    else:
+                        print(storednum)
+                except IndexError:
+                    print(storednum)
+               
+            elif char == "@": # sleep
+                try:
+                    sleep(int(shellIn[curnum+1]))
+                except ValueError:
+                    print(f"\nERROR: Char {curnum}: An integer is required for sleeping")
+                    exit()
+            
+                    
+            
+            if lookinfortxt:
+                txtfound += char
+
+            curnum += 1
\ No newline at end of file
diff --git a/index.html b/index.html
index a775bd8..7c876b5 100644
--- a/index.html
+++ b/index.html
@@ -1,23 +1,21 @@
 <!DOCTYPE html>
 <html>
     <style>
-        h1{
-            color:sienna;
-            font-family: "Segoe UI";
-            font-size: 45px;
-        }
+        
     </style>
     
     
     <head>
         <title>potatoscript - home</title>
-        <link rel="icon" type="image/png" href="website/favicon.png"/>
+        <link rel="icon" type="image/png" href="website/img/favicon.png"/>
+        <link rel="stylesheet" type="text/css" href="website/css/style.css"/>
     </head>
     <body>
-        <h1>potatoscript</h1>
+        <img src="website/img/potscr.png">
+        <!--<h1>potatoscript</h1>!-->
         <h2>potatoscript is an esoteric programming language, similar to unlambda.</h3>
-        <a href="website/guide.html">potatoscript programming guide</a>
+        <a href="website/guide.html"><button>potatoscript programming guide</button></a>
         <p></p>
-        <a href="website/cli.html">cli usage guide</a>
+        <a href="website/cli.html"><button>cli usage guide</button></a>
     </body>
 </html>
\ No newline at end of file
diff --git a/potscr.py b/potscr.py
index 7544c05..886a2dc 100644
--- a/potscr.py
+++ b/potscr.py
@@ -1,34 +1,37 @@
 #! python
 
-from sys import argv
-import sys
+from sys import argv, stdout
 from time import sleep
-import os
+from os import remove
+from files.shell import shell
+from shutil import rmtree
 
-ver = "2.18" # format: major potscr release number (dot) commit number
+ver = "3.19" # format: major potscr release number (dot) commit number
 
 using_py = False
 script_ok = False
 lookinfortxt = False
+shell_ok = False
 logit = False
 len = 0
 curnum = 0
+storednum = 0
 txtfound = ""
 stored = ""
 logpath = ""
-storednum = 0
 
 helptxt = f"""
 
 potatoscript parser v{ver}    
 
-usage: potscr [-h] (input file) [-l (log file)]
+usage: potscr [-s] [-h] (input file) [-l (log file)]
 
 arguments:
 
 -h,--help: shows help
 -l,--logpath (log file): sets a path for the log file
-    
+-s,--shell: interactive potatoscript shell
+
     """
 noargtxt = f"""
 
@@ -38,6 +41,7 @@
             
             """
 
+rmtree("files\__pycache__")
 
 if argv[0] == "potscr" or argv[0] == "potscr.py":
     using_py = True
@@ -70,14 +74,18 @@
     if i == "--logpath" or i == "-l":
         logit = True
         try:
-            print(argv[tempnum+1])
             logpath = argv[tempnum+1]
             logfile = open(logpath,"x")
         except FileExistsError:
-            os.remove(logpath)
-            print(argv[tempnum+1])
+            remove(logpath)
             logpath = argv[tempnum+1]
             logfile = open(logpath,"x")
+        except IndexError:
+            print("ERROR: no path specified for log file")
+
+if "-s" in argv or "--shell" in argv:
+    shell_ok = True
+    
 
 if using_py:
     if argv[1].endswith(".potscr") or argv[1].endswith(".potato") or argv[1].endswith(".pscr"):
@@ -85,114 +93,185 @@
         readit = file.read()
         if not readit.startswith("~"):
             print("ERROR: This is not a potatoscript file! Did you forget the ~ in the beginning?")
+            exit()
         else:
             if not readit.endswith("~"):
                 print("ERROR: This file has no ending indicator!")
-            else:
-                script_ok = True
+                exit()
+            
 else:
     if argv[0].endswith(".potscr") or argv[0].endswith(".potato") or argv[0].endswith(".pscr"):
         file = open(argv[0],"r")
         readit = file.read()
         if not readit.startswith("~"):
             print("ERROR: This is not a potatoscript file! Did you forget the ~ in the beginning?")
+            exit()
         else:
             if not readit.endswith("~"):
                 print("ERROR: This file has no ending indicator!")
-            else:
-                script_ok = True
-
-if not script_ok:
-    exit()
-
-for c in readit:
-    len += 1
-
-for i in range(0,len):
-    char = readit[curnum]
-    if char == "-": # start of print
-        lookinfortxt = True
-        if logit:
-            logfile.write("LOG: print start\n")
-    elif char == "_": # end of print
-        lookinfortxt = False
-        if readit[curnum+1] == "%": # percentage after means an alt version of the command, in this case no newline
-            sys.stdout.write(txtfound[1:])
-            sys.stdout.flush()
-            if logit:
-                logfile.write("LOG: print end (no newline)\n")
-                logfile.write(f"LOG: printed {txtfound[1:]}\n")
-                txtfound = ""
-        else:
-            print(txtfound[1:])
-            if logit:
-                logfile.write("LOG: print end\n")
-                logfile.write(f"LOG: printed {txtfound[1:]}\n")
-                txtfound = ""
-    elif char == "#": # get input
-        temp = input()
-        if temp.isnumeric() and readit[curnum+1] == "%":
-            storednum = int(temp)
-            if logit:
-                logfile.write("LOG: got input from user\n")
-                logfile.write(f"LOG: storednum = {storednum}\n")
-        else:
-            stored = temp
-            if logit:
-                logfile.write("LOG: got input from user\n")
-                logfile.write(f"LOG: stored = {stored}\n")
-
-    elif char == "$": # print stored var
-        print(stored,end="")
-        if logit:
-            logfile.write(f"LOG: printed stored ({stored})\n")
-    elif char == "/": # newline
-        print("")
-        if logit:
-            logfile.write("LOG: printed newline\n")
-    elif char == "*": # reset stored number
-        storednum = 0
-        if logit:
-            logfile.write("LOG: storednum reset\n")
-    elif char == "+": # number +1
+                exit()
+
+
+
+if shell_ok:
+    shell()
+
+        
+
+# when this is updated, copy-paste into shell.py
+
+if not shell_ok:
+    def mathsomethin(type):
+        global storednum
         if readit[curnum+1] == "%":
             if readit[curnum+2].isnumeric():
-                storednum += int(readit[curnum+2])
+                if type == "+":
+                    storednum += int(readit[curnum+2])
+                elif type == "-":
+                    storednum -= int(readit[curnum+2])
+                elif type == "*":
+                    storednum = storednum * int(readit[curnum+2])
+                elif type == "/":
+                    storednum = storednum / int(readit[curnum+2])
+
+                if logit:
+                    if type == "+":
+                        logfile.write(f"LOG: added {int(readit[curnum+2])} to storednum (now {storednum})\n")
+                    elif type == "-":
+                        logfile.write(f"LOG: subtracted {int(readit[curnum+2])} from storednum (now {storednum})\n")
+                    elif type == "*":
+                        logfile.write(f"LOG: multiplied {int(readit[curnum+2])} by storednum (now {storednum})\n")
+                    elif type == "/":
+                        logfile.write(f"LOG: divided {int(readit[curnum+2])} by storednum (now {storednum})\n")
             else:
-                storednum += 5
-            if logit:
-                logfile.write(f"LOG: added five to storednum (now {storednum})\n")
+                if type == "+":
+                    storednum += 5
+                elif type == "-":
+                    storednum -= 5
+                elif type == "*":
+                    storednum = storednum * 5
+                elif type == "/":
+                    storednum = storednum / 5
+
+                if logit:
+                    if type == "+":
+                        logfile.write(f"LOG: added 5 to storednum (now {storednum})\n")
+                    elif type == "-":
+                        logfile.write(f"LOG: subtracted 5 from storednum (now {storednum})\n")
+                    elif type == "*":
+                        logfile.write(f"LOG: multiplied 5 by storednum (now {storednum})\n")
+                    elif type == "/":
+                        logfile.write(f"LOG: divided 5 by storednum (now {storednum})\n")
         else:
-            storednum += 1
+            if type == "+":
+                storednum += 1
+            elif type == "-":
+                storednum -= 1
+            elif type == "*":
+                storednum = storednum * 1
+            elif type == "/":
+                storednum = storednum / 1
+
             if logit:
-                logfile.write(f"LOG: added one to storednum (now {storednum})\n")
-        
-    elif char == "`": # number -1
-        if readit[curnum+1] == "%":
-            if readit[curnum+2].isnumeric():
-                storednum -= int(readit[curnum+2])
+                if type == "+":
+                    logfile.write(f"LOG: added 1 to storednum (now {storednum})\n")
+                elif type == "-":
+                    logfile.write(f"LOG: subtracted 1 from storednum (now {storednum})\n")
+                elif type == "*":
+                    logfile.write(f"LOG: multiplied 1 by storednum (now {storednum})\n")
+                elif type == "/":
+                    logfile.write(f"LOG: divided 1 by storednum (now {storednum})\n")
+
+
+
+    for i in range(0,readit.__len__()):
+        char = readit[curnum]
+        if char == "-": # start of print
+            lookinfortxt = True
+            if logit:
+                logfile.write("LOG: print start\n")
+        elif char == "_": # end of print
+            lookinfortxt = False
+            try:
+                if readit[curnum+1] == "%": # percentage after means an alt version of the command, in this case no newline
+                    stdout.write(txtfound[1:])
+                    stdout.flush()
+                    if logit:
+                        logfile.write("LOG: print end (no newline)\n")
+                        logfile.write(f"LOG: printed {txtfound[1:]}\n")
+                    txtfound = ""
+                else:
+                    print(txtfound[1:])
+                    if logit:
+                        logfile.write("LOG: print end\n")
+                        logfile.write(f"LOG: printed {txtfound[1:]}\n")
+                    txtfound = ""
+            except IndexError:
+                print(txtfound[1:])
+                if logit:
+                    logfile.write("LOG: print end\n")
+                    logfile.write(f"LOG: printed {txtfound[1:]}\n")
+                txtfound = ""
+        elif char == "#": # get input
+            temp = input()
+            if temp.isnumeric() and readit[curnum+1] == "%":
+                storednum = int(temp)
+                if logit:
+                    logfile.write("LOG: got input from user\n")
+                    logfile.write(f"LOG: storednum = {storednum}\n")
+            elif readit[curnum+1] == "%" and not temp.isnumeric():
+                print("ERROR: Input must be an integer!")
+                if logit:
+                    logfile.write("ERROR: Input must be an integer!")
+                exit()
             else:
-                storednum -= 5
+                stored = temp
+                if logit:
+                    logfile.write("LOG: got input from user\n")
+                    logfile.write(f"LOG: stored = {stored}\n")
+
+        elif char == "$": # print stored var
+            print(stored,end="")
             if logit:
-                logfile.write(f"LOG: subtracted five from storednum (now {storednum})\n")
-        else:
-            storednum -= 1
+                logfile.write(f"LOG: printed stored ({stored})\n")
+        elif char == "/": # newline
+            print("")
             if logit:
-                logfile.write(f"LOG: subtracted one from storednum (now {storednum})\n")
-    elif char == "^": # print stored num
-        print(storednum,end="")
-        if logit:
-            logfile.write(f"LOG: printed storednum ({storednum})\n")
-    elif char == "@": # sleep
-        try:
-            sleep(int(readit[curnum+1]))
+                logfile.write("LOG: printed newline\n")
+        elif char == "*": # reset stored number
+            storednum = 0
             if logit:
-                logfile.write(f"LOG: slept for {int(readit[curnum+1])} second(s)\n")
-        except ValueError:
-            print(f"\nERROR: Char {curnum}: An integer is required for sleeping")
-            exit()
-    
-    if lookinfortxt:
-        txtfound += char
+                logfile.write("LOG: storednum reset\n")
+        elif char == "+": # number +
+            mathsomethin("+")
+        elif char == "`": # number -
+            mathsomethin("-")
+        elif char == ">": # number multiplied
+            mathsomethin("*")
+        elif char == "&": # number divided
+            mathsomethin("/")
+        elif char == "^": # print stored num
+            if readit[curnum+1] == "%":
+                print(storednum,end="")
+            else:
+                print(storednum)
+        
+            if logit:
+                logfile.write(f"LOG: printed storednum ({storednum})\n")
+        elif char == "@": # sleep
+            try:
+                sleep(int(readit[curnum+1]))
+                if logit:
+                    logfile.write(f"LOG: slept for {int(readit[curnum+1])} second(s)\n")
+            except ValueError:
+                print(f"\nERROR: Char {curnum}: An integer is required for sleeping")
+                exit()
+        
+                
+        
+        if lookinfortxt:
+            txtfound += char
+
+        curnum += 1
 
-    curnum += 1
+        
\ No newline at end of file
diff --git a/website/cli.html b/website/cli.html
index 6f4bc1e..6642f80 100644
--- a/website/cli.html
+++ b/website/cli.html
@@ -1,22 +1,15 @@
 <html>
     <style>
-        h1{
-            color:sienna;
-            font-family: "Segoe UI";
-            font-size: 45px;
-        }
-        code{
-            color: sienna;
-            font-size: 15px;
-        }
+    
     </style>
 
     <head>
         <title>potatoscript - cli</title>
-        <link rel="icon" type="image/png" href="website/favicon.png"/>
+        <link rel="icon" type="image/png" href="website/img/favicon.png"/>
+        <link rel="stylesheet" type="text/css" href="css/style.css"/>
     </head>
     <body>
-        <a href="https://nanobot567.github.io/potscr/index.html">back</a>
+        <a href="https://nanobot567.github.io/potscr/index.html"><button>back</button></a>
         <h1>potatoscript cli</h1>
         <h2>usage</h2>
         <h4>to parse a potatoscript file, follow these steps: </h4>
@@ -28,7 +21,7 @@ <h4>to parse a potatoscript file, follow these steps: </h4>
                 navigate to the directory where your potatoscript file is stored using cd.
             </li>
             <li>
-                run "(path_to_potscr.py) (potatoscript file)"". if no errors are found, the code will excecute.
+                run "(path_to_potscr.py) (potatoscript file)". if no errors are found, the code will excecute.
             </li>
         </ul>
         <h2>arguments</h2>
@@ -38,5 +31,7 @@ <h3>-l or --logpath</h3>
         <h4>sets a path for a log file.</h4>
         <h4>example:</h4>
         <code>potscr.py test_files/maths.potscr --logpath maths_log.txt</code>
+        <h3>-s or --shell</h3>
+        <h4>starts the potatoscript shell prompt</h4>
     </body>
 </html>
\ No newline at end of file
diff --git a/website/css/style.css b/website/css/style.css
new file mode 100644
index 0000000..6775588
--- /dev/null
+++ b/website/css/style.css
@@ -0,0 +1,35 @@
+h1{
+    color:sienna;
+    font-family: "Segoe UI";
+    font-size: 45px;
+    width:100%;
+    overflow:hidden;
+    }
+code{
+        color: sienna;
+        font-size: 15px;
+    }
+
+img{
+    animation: slide 3s;
+    width: 400px;
+}
+button{
+    background-color: sienna;
+    color: white;
+}
+
+
+@keyframes slide {
+    from {
+        margin-left: 20%;
+        opacity: 0%; 
+    }
+
+    to {
+        margin-left: 0%;
+        opacity: 100%;
+        
+    }
+    
+}
\ No newline at end of file
diff --git a/website/guide.html b/website/guide.html
index ce4bc96..6fd68f5 100644
--- a/website/guide.html
+++ b/website/guide.html
@@ -1,23 +1,14 @@
 <!DOCTYPE html>
 <html>
-    <style>
-        h1{
-            color:sienna;
-            font-family: "Segoe UI";
-            font-size: 45px;
-        }
-        code{
-            color: sienna;
-            font-size: 15px;
-        }
-    </style>
+    
 
     <head>
         <title>potatoscript - guide</title>
         <link rel="icon" type="image/png" href="https://nanobot567.github.io/potscr/website/favicon.png"/>
+        <link rel="stylesheet" type="text/css" href="css/style.css"/>
     </head>
     <body>
-        <a href="https://nanobot567.github.io/potscr/index.html">back</a>
+        <a href="https://nanobot567.github.io/potscr/index.html"><button>back</button></a>
         <h1>potatoscript guide</h1>
         <h2>basics</h2>
         <h4>
@@ -72,6 +63,12 @@ <h2>indicators</h2>
             <li>
                 "`" - subtract one from the stored number
             </li>
+            <li>
+                ">" - multiply the stored number by the integer specified
+            </li>
+            <li>
+                "&" - divide the stored number by the integer specified
+            </li>
             <li>
                 "^" - print the stored number
             </li>
@@ -79,18 +76,22 @@ <h2>indicators</h2>
                 "@" - sleep for the integer after the indicator
             </li>
             <li>
-                "%" - alt version of command
+                "%" - alt version of the indicator
             </li>
                 
         </ul>
         <h2>alt commands</h2>
-        <h3><code>+</code></h3>
-        <h4>depending on how you use %, the + indicator can do different things.</h4>
-        <h4>if % is behind an integer and is in front of +, the stored number is increased by that integer. </h4>
-        <h4>if not, the stored number is increased by 5.</h4>
+        <h3><code>+, -, >, and & (math indicators)</code></h3>
+        <h4>depending on how you use %, these indicators can do different things.</h4>
+        <h4>if % is behind an integer and is in front of a math indicator, the stored number is increased, decreased, multiplied, or divided by that integer, depending on which indicator you use.</h4>
+        <h4>if not, the stored number is increased, decreased, multiplied, or divided by 5.</h4>
+        <p></p>
+        <h4>NOTE: the integer to be used can only be 1 character long for the operation to work as expected.</h4>
+        <p></p>
+        <h3><code>_ (print end)</code></h3>
+        <h4>if % is in front of _, the string printed has no newline printed at the end.</h4>
         <p></p>
-        <h4>NOTE: the integer to be added can only be 1 character long for the addition to work properly.</h4>
-        <h3><code>-</code></h3>
-        <h4>the same commands as + are preformed if % is in front of -.</h4>
+        <h3><code># (get input)</code></h3>
+        <h4>if % is used, the input gathered from the user is stored as an integer.</h4>
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