2015-05-14 10:21:03 -0400, r...@som.pdp10.guru:
> Dear Bash developers,
> In effort to create better commented code, I have run across the following 
> missing bit of functionality:
> No block comments
> Which prevents such useful constructs as:
> echo  "foo" #! useful comment 1 !# \
>       $(somefunction) #! Another comment !# \
>       "bar" # standard line comment can go here
> 
> yum install \
>       package1 #! why it is being installed !# \
>       package2 #! why this one is needed !# \
>       ...
>       packageN # Reason for final package
> 
> Thank you for your time and consideration
> -Jeremiah
> 

Note that you can do:

packages=(
  package1 # why it is being installed
  package2 # why this one is needed
  ...
  packageN # Reason for final package
)

yum install "${packages[@]}"

-- 
Stephane


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