[ale] bash commands

[Geoffrey Myers]

On 05/21/2012 09:58 AM, Matthew wrote:
> Never use pipe | for that, usually in this context, "cat doc |grep hello"

But then, this is a waste of a process when you could simply do this:

grep hello doc

>
> On 5/21/12, Geoffrey Myers<lists at serioustechnology.com>  wrote:
>> On 05/18/2012 05:27 PM, Drifter wrote:
>>> I keep reminding myself that I don't begin to know what I think I know!
>>> :(
>>>
>>> I am about to upgrade this box, finally from FC 13 to FC 14.
>>> Ought to be simple enough.  I have the CD, which I think will do a clean
>>> install onto a software RAID.
>>>
>>> Prior to that I really ought to have on hand a list of all the installed
>>> packages.
>>>
>>> So I created a file<app_list.txt>   on the Desktop and then tried this:
>>>
>>> yum list installed | ~/Desktop/app_list.txt
>>> and got back this
>>>
>>> bash: /home/kilpatms/Desktop/app_list.txt: Permission denied
>>>
>>> WTF!
>>
>> The | is used to send the put of a command for processing by another
>> command, thus your attempt above is going to try to execute your
>> app_list.txt file.  You want to redirect the output to the file:
>>
>> yum list installed>  ~/Desktop/app_list.txt
>>
>>>
>>> So I checked the perms on the existing (empty) file and they were
>>> correct.
>>> Then I tried the same thing as root, expanding the ~/ and got the same
>>> response.
>>>
>>> So, How DO I make yum throw a list of the installed packages to a text
>>> file
>>> rather than to the terminal?
>>>
>>> Sean
>>>
>>>
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>>
>>
>> --
>> Until later, Geoffrey
>>
>> "I predict future happiness for America if they can prevent
>> the government from wasting the labors of the people under
>> the pretense of taking care of them."
>> - Thomas Jefferson
>> _______________________________________________
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>> Ale at ale.org
>> http://mail.ale.org/mailman/listinfo/ale
>> See JOBS, ANNOUNCE and SCHOOLS lists at
>> http://mail.ale.org/mailman/listinfo
>>
>


-- 
Until later, Geoffrey

"I predict future happiness for America if they can prevent
the government from wasting the labors of the people under
the pretense of taking care of them."
- Thomas Jefferson