Looking for help converting a .bat to .sh

I have spent ages on Google trying to convert the code

But i have found guide to the different programs but they just don't help for what i'm doing as i have a complex .bat file this is for a new control system i am working on its like cpanel but i want it for windows as well but i have not built the installing bit of it only the options but the installing bit is really easy yum lol and for widows well run the installers


@echo off
:mainmenu
CLS
echo ##############################################################################
echo ##############################################################################
echo ## Welcome to PhdPanel Installer ##
echo ## 1. Install Recomended ##
echo ## 2. Install No MySQL ##
echo ## 3. Install No DNS ##
echo ## 4. Custom Install ##
echo ## 5. Read Me File ##
echo ## 6. Terms ##
echo ##############################################################################
echo ##############################################################################
GOTO inputloop

:inputloop
echo Please use options above
SET /p choice=
IF %choice% == 1 GOTO Option1
IF %choice% == 2 GOTO Option2
IF %choice% == 3 GOTO Option3
IF %choice% == 4 GOTO Option4
IF %choice% == 5 GOTO Option5
IF %choice% == 6 GOTO Option6
IF %choice% == EXIT EXIT
GOTO mainmenu
@pause

:Option1
echo Sorry Installer Not Created yet
echo Installer Begining
echo yum install -y httpd php apache mysql php-mysql mysql-admin mysql-server vsftp name caching-nameservers sendmail
@pause
EXIT

:Option2
echo Sorry Installer Not Created yet
echo Installer Begining
echo yum install -y httpd php apache php vsftp name caching-nameservers sendmail
@pause
EXIT

:Option3
echo Sorry Installer Not Created yet
echo Installer Begining
echo yum install -y httpd php apache php-mysql vsftp sendmail mysql php-mysql mysql-admin mysql-server
@pause
EXIT

:Option4
GOTO startcustom
EXIT

:Option5
CLS
echo ##############################################################################
echo ##############################################################################
echo ## This is the Readmore Section Copyright of martin barker ##
echo ## and Richarch Dickinson ##
echo ##############################################################################
echo ##############################################################################
@pause
GOTO mainmenu

:Option6
CLS
echo ##############################################################################
echo ##############################################################################
echo ## The Terms and conditions ##
echo ##############################################################################
echo ##############################################################################
@pause
GOTO mainmenu

:startcustom
SET co1=on
SET co2=on
SET co3=on
SET co4=on
SET co5=on
SET co6=on
SET co7=on
GOTO customdraw

:switch1
IF %co1% == on GOTO sw1n
IF %co1% == off GOTO sw1f

:sw1n
SET co1=off
GOTO customdraw

:sw1f
SET co1=on
GOTO customdraw

:switch2
IF %co2% == on GOTO sw2n
IF %co2% == off GOTO sw2f

:sw2n
SET co2=off
GOTO customdraw

:sw2f
SET co2=on
GOTO customdraw

:switch3
IF %co3% == on GOTO sw3n
IF %co3% == off GOTO sw3f

:sw3n
SET co3=off
GOTO customdraw

:sw3f
SET co3=on
GOTO customdraw

:switch4
IF %co4% == on GOTO sw4n
IF %co4% == off GOTO sw4f

:sw4n
SET co4=off
GOTO customdraw

:sw4f
SET co4=on
GOTO customdraw

:switch5
IF %co5% == on GOTO sw5n
IF %co5% == off GOTO sw5f

:sw5n
SET co5=off
GOTO customdraw

:sw5f
SET co5=on
GOTO customdraw

:switch6
IF %co6% == on GOTO sw6n
IF %co6% == off GOTO sw6f

:sw6n
SET co6=off
GOTO customdraw

:sw6f
SET co6=on
GOTO customdraw

:switch7
IF %co7% == on GOTO sw7n
IF %co7% == off GOTO sw7f

:sw7n
SET co7=off
GOTO customdraw

:sw7f
SET co7=on
GOTO customdraw

:custominstall
echo Sorry Installer Not Created yet
echo Installer Begining
echo yum install -y
@pause
EXIT

:customdraw
CLS
set Cchoice=Install
echo ##############################################################################
echo ##############################################################################
echo ## Welcome to PhdPanel Custom Installer ##
IF %co1% == on echo ## 1. Apache [%co1%] ##
IF %co1% == off echo ## 1. Apache [%co1%] ##
IF %co2% == on echo ## 2. Httpd [%co2%] ##
IF %co2% == off echo ## 2. Httpd [%co2%] ##
IF %co3% == on echo ## 3. php-mysql [%co3%] ##
IF %co3% == off echo ## 3. php-mysql [%co3%] ##
IF %co4% == on echo ## 4. php(no SQL) [%co4%] ##
IF %co4% == off echo ## 4. php(no SQL) [%co4%] ##
IF %co5% == on echo ## 5. ftp [%co5%] ##
IF %co5% == off echo ## 5. ftp [%co5%] ##
IF %co6% == on echo ## 6. DNS [%co6%] ##
IF %co6% == off echo ## 6. DNS [%co6%] ##
echo ## ##
echo ## Press Return to Install ##
echo ##############################################################################
echo ##############################################################################
echo Please use options above
SET /p Cchoice=
IF %Cchoice% == 1 GOTO switch1
IF %Cchoice% == 2 GOTO switch2
IF %Cchoice% == 3 GOTO switch3
IF %Cchoice% == 4 GOTO switch4
IF %Cchoice% == 5 GOTO switch5
IF %Cchoice% == 6 GOTO switch6
IF %Cchoice% == 7 GOTO switch7
IF %Cchoice% == Install GOTO custominstall
IF %Cchoice% == EXIT EXIT
GOTO customdraw


BTW wasn't joking when i said it was complex

P.S sorry if this is in the wrong place

A .sh file in linux can actually use many different shells. But you are probably wanting either bash or perl. If you use perl the program could also be used on Windows if perl is installed (yes, perl can be used for command line work).

Since I am guessing you want bash here is a website that I found that looks like it might be helpful:

http://www.hypexr.org/bash_tutorial.php

Also, here are 2 powerpoints posted by some professor that I found. I have used these before:
http://csserver.evansville.edu/~richardson/courses/CS375_UNIX_System_Programming/resources/lectures/l03/html/l03_BASH_1.html

http://csserver.evansville.edu/~richardson/courses/CS375_UNIX_System_Programming/resources/lectures/l04/html/l04_BASH_2.html