Re: GURU NEEDED : break a command into several lines and comment each line

[Oleksandr Gavenko <gavenko@bifit.com.ua>]

On 13.01.2011 23:18, bolega wrote:
> Basically, I have spent a few hours experimenting and searching on the
> comp.unix.shell
>
> how to break a command with several switches into more than one line
> AND to be able to put some comment on each line.
>
> #!/bin/bash -xv
>
> command       \ # comment1
>           -sw1 \ # comment2
>           -sw2 \ # comment3
>           arguments
>
> One ought to be able to comment every single switch if desired for
> whatever reason.
>
This is offtopic for this list.

But seems POSIX shell do not support inline comments.

You can use such trick (: is NOP command, but `` invoke shell, so 
consume CPU resource):

   $ printarg -x `: this opt allow x` \
   -y `: this opt allow y` \
   -z `: this opt allow z`
"printarg"
"-x"
"-y"
"-z"

I put comments before command like (example from Makefile):

# /O1  creates small code
# /Oi-  disable generate intrinsic functions (to save exe size)
# /Oy  omit frame pointer
# /Gm-  disable minimal rebuild
OPTIM_CFLAGS =  /O1 /Oi- /Oy /Gm-