Raspberry Pi, combining commands

If I understand you correctly, I think what you want is to define a function with arguments for the LED number and whether you want to turn the LED on or off.  Then you can just call the function for each desired transition.

There are examples of GPIO software for various languages at the RasPi Hardware Wiki.

You also might re-post your question at the element14 Raspberry Pi group.  More Razzers may see it there.

Henry,

   John gave a very good reference for examples.

To explain a little bit more, there are commands that you type interactively

at the "shell" prompt, such as 'ls' and 'pwd'.  You can use a text editor to create

a file and put any of those shell commands into the file, then close the file,

and then make the file executable, by typing

         chmod  +x  somefilename

Then you can run the commands in the file from the command line by typing

the name of the file.  To avoid any possible confusion with other files with the

same name in other directories, it is safest to use './" in front of the file name, such as

      ./somefilename

The './" means to use the file in the current directory (because '.' means current directory

and '/' is the separator between directory names and file names).

Alternatively, you could run the file by typing

    bash ./somefilename

which is maybe less convenient, but doesn't require the 'chmod' step.

bash is a shell command interpreter.  You can see an example from John's link.

Besides putting simple commands in a bash script, you can add parameters to the

script, just like the 'cat' command takes a parameter of which file to display.

Typing 'man bash' will give you the manual for bash.

Besides shell scripts, you can also put your commands in an interpreted programming

language script, such as python, which also has an example in John's link.  That allows

you do do more complex things in your script than you can do using bash.

Henry,

   John gave a very good reference for examples.

To explain a little bit more, there are commands that you type interactively

at the "shell" prompt, such as 'ls' and 'pwd'.  You can use a text editor to create

a file and put any of those shell commands into the file, then close the file,

and then make the file executable, by typing

         chmod  +x  somefilename

Then you can run the commands in the file from the command line by typing

the name of the file.  To avoid any possible confusion with other files with the

same name in other directories, it is safest to use './" in front of the file name, such as

      ./somefilename

The './" means to use the file in the current directory (because '.' means current directory

and '/' is the separator between directory names and file names).

Alternatively, you could run the file by typing

    bash ./somefilename

which is maybe less convenient, but doesn't require the 'chmod' step.

bash is a shell command interpreter.  You can see an example from John's link.

Besides putting simple commands in a bash script, you can add parameters to the

script, just like the 'cat' command takes a parameter of which file to display.

Typing 'man bash' will give you the manual for bash.

Besides shell scripts, you can also put your commands in an interpreted programming

language script, such as python, which also has an example in John's link.  That allows

you do do more complex things in your script than you can do using bash.