Use of && & || in Bash scripts (was: Using Ubuntu absolves the user of personal responsibility (no I'm guilty) and can you help me with my problem?)

[José Paulo Matafome Oleiro]

On 8/4/06, Alexander Skwar <listen at alexander.skwar.name> wrote:
>
> · José Paulo Matafome Oleiro <matafomeoleiro at gmail.com>:
>
> > $ sudo mount -o loop -t iso9660 /isofile /mountpoint && sudo apt-get
> > install package_name && sudo mount -o loop -t
> > iso9660 /isofile /mountpoint
> > (this can mount the iso file at the end of the process again, should it
> > work, or I need to replace && with || I don't know maybe you can help me
> > with this out
>
> && means "do, if successful"
> || means "do, if not successful"
>
> Thus your command line means:
>
>         mount isofile
>         if that's successful, do apt-get
>         if that (ie. apt-get) is successful, do mount isofile
>
> && and || are short forms for "if". Your command could also be written
> as:
>
>         if sudo mount -o loop -t iso9660 /isofile /mountpoint; then
>                 if sudo apt-get install package_name; then
>                         sudo mount -o loop -t iso9660 /isofile /mountpoint
>                 fi
>         fi
>
> Alexander Skwar


Thanks for you help

Sincerely
José Oleiro
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