commands

[Michael Havens]

I understand! thank you.

:-)~MIKE~(-:

On Tue, Dec 23, 2014 at 1:45 AM, Kevin Fries <kevin at fries-biro.com> wrote:

> The brackets expand in place.  It does not expand your command, but
> instead the parameters.  Let's say I wanted to create a list of
> direcrories.   I could do something like this
>
> $ mkdir -p a/{b,c/{d,e,f}}
>
> This expands to
>
> $ mkdir -p a/b a/c/d a/c/e a/c/f
>
> Sidenote... what if you wanted a directory named abc and second one abcde?
>
> $ mkdir -p abc{,de}
>
> The comma with nothing before it, gives you abc, and the de after the
> comma gives you abcde
>
> Does this make more sense?  apt-get is your command, and update and
> upgrade are the parameter to the command.  When you were using the curley
> brackets, you were expanding a single command with two incompatible
> parameters.
>
> Hope this makes sense.
>
> Kevin
>  On Dec 23, 2014 12:09 AM, "Michael Havens" <bmike1 at gmail.com> wrote:
>
>> thank you so much. the way I figure it 'apt-get' is the command I'm
>> expanding. But the command must be 'apt-get update, and 'apt-get upgrade'.
>>
>> :-)~MIKE~(-:
>>
>> On Tue, Dec 23, 2014 at 12:03 AM, Kevin Fries <kevin at fries-biro.com>
>> wrote:
>>
>>> Michael,
>>>
>>> As Matt said, braces expand into the same command, they are not used for
>>> multiple commands.  FOR is used for multiple commands.  While this is much
>>> more work in my opinion, this would also work... provided that there is no
>>> error.
>>>
>>> $ for cmd in update upgrade; do sudo apt-get ${cmd}; done
>>>
>>> This runs the two command in serial regardless of the results of either
>>> command.  My original answer did not run the second command if the first
>>> command failed.
>>>
>>> Kevin
>>> On Dec 22, 2014 11:55 PM, "Michael Havens" <bmike1 at gmail.com> wrote:
>>>
>>>> thank you Matt and Kevin. I was looking for a way to combine the two
>>>> commands with the curly brackets.
>>>>
>>>> :-)~MIKE~(-:
>>>>
>>>> On Mon, Dec 22, 2014 at 11:36 PM, Matt Birkholz <
>>>> matt at birchwood-abbey.net> wrote:
>>>>
>>>>> > From: Michael Havens <bmike1 at gmail.com>
>>>>> > Date: Mon, 22 Dec 2014 15:46:23 -0700
>>>>> >
>>>>> > I was thinking, I could type in 'sudo apt-get update;sudo apt-get
>>>>> > upgrade' but what would be a more efficient way?
>>>>> >
>>>>> > [...]
>>>>> >
>>>>> > sudo apt-get {update, upgrade}
>>>>> > E: Invalid operation {update,
>>>>> >
>>>>> > This is interesting: when I typed in 'sudo {apt-get {update;
>>>>> upgrade}}' it
>>>>> > didn't give me an error for '{update'
>>>>> >
>>>>> > So does anyone know what I'm talking about and how to do it?
>>>>>
>>>>> Brace expansion is performed on a command.  A semicolon separates
>>>>> commands.  Your command line
>>>>>
>>>>>         sudo {apt-get {update; upgrade}}
>>>>>
>>>>> is interpreted as two commands:
>>>>>
>>>>>         sudo {apt-get {update
>>>>>         upgrade}}
>>>>>
>>>>> So sudo complains about a strange command name "{apt-get", the
>>>>> argument "{update" passes without comment, and the shell complains
>>>>> about the command name "upgrade}}".
>>>>>
>>>>> You cannot stick an unescaped semicolon inside braces.
>>>>>
>>>>> Most efficient?  Stick this in ~/.bashrc
>>>>>
>>>>>         alias do-it='sudo sh -c "apt-get update; apt-get upgrade"'
>>>>>
>>>>> so you can say just
>>>>>
>>>>>         do-it
>>>>>
>>>>> ?
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