CSC231 Bash Tutorial 6

--D. Thiebaut (talk) 22:18, 21 March 2017 (EDT)

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Script File

Let's create a simple batch file that will allow you to automatically assemble, link, and run an assembly program. Furthermore, we'll link it with the 231Lib library, just to be safe. If it doesn't use it, it should be fine.

The commands you normally use to go through this process are the following:

nasm -f elf progName.asm
ld -melf_i386 progName.o 231Lib.o -o progName
./progName

Let's create a script file called nald (for nasm ld) that will run these 3 commands automatically. For now, just copy the code without worrying too much about what happens. We'll explain what's going on later.

• emacs a new file called nald
• Store the following lines in it:

 
#! /bin/bash
 
nasm -f elf $1.asm
nasm -f elf 231Lib.asm
ld -melf_i386 $1.o 231Lib.o -o $1
./$1

• Make sure that the #-sign is the first character on the first line of the script.
• Make the script executable:

chmod +x nald

chmod is a command that changes the permissions of a file. "+x" means that everybody including you, everybody in the 231 class, and everybody who has an account on Aurora can execute your script.