[ale] bash commands

[Wolf Halton]

On Sun, May 20, 2012 at 1:01 AM, arxaaron <arxaaron at gmail.com> wrote:

> On 2012/05/19, at 11:21 , Damon L. Chesser wrote:
>
> > On Sat, 2012-05-19 at 10:54 -0400, arxaaron wrote:
> >> On 2012/05/18, at 17:55 , Drifter wrote:
> >>
> >>> Thanks.  That did it.
> >>>
> >>> sean
> >>>
> >>
> >>
> >> Pipes ["|"] are for moving output across processes.
> >>
> >> I suspect that bash was trying to run your empty text file
> >> as a process.  "Permission Denied" was an appropriate
> >> error message.
> >>
> >> Redirects [">" | ">>"] are for writing output streams to files.
> >> The first version appends to the file (and creates it if it doesn't
> >> exist),  the second "double" form overwrites the file (or creates
> >> it if it doesn't exist)
> >
> > Aaron,
> >
> > I think you got it backwards:
> >
> > damon at dam-main:~/Desktop$ touch testredirect.xt
> > damon at dam-main:~/Desktop$ echo 1 > testredirect.xt
> > damon at dam-main:~/Desktop$ echo 2 > testredirect.xt
> > damon at dam-main:~/Desktop$ cat testredirect.xt
> > 2
> > damon at dam-main:~/Desktop$ echo 1 >> testredirect.xt
> > damon at dam-main:~/Desktop$ cat testredirect.xt
> > 2
> > 1
> >
>
> DOH!!  Thank you.  I did state that backward. Yours is correct:
> ">>" is the append to file redirect.
>
> peace
> aaron
>
>
>
>
>
>
> >
> >>
> >> HTH
> >> peace
> >> aaron
> >>
> >>>
> ------------------------------------------------------------------------------------
> >>>
> >>> On Friday, May 18, 2012 05:37:43 pm Robert L. Harris wrote:
> >>>> try ">" instead of "|"
> >>>>
> >>>> On Fri, May 18, 2012 at 3:27 PM, Drifter <drifter at oppositelock.org>
> >>> 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!
> >>>>>
> >>>>> 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
> >>>>>
> >>>>>
> >>>>> _______________________________________________
> >>>>> Ale mailing list
> >>>>> Ale at ale.org
> >>>>> http://mail.ale.org/mailman/listinfo/ale
> >>>>> See JOBS, ANNOUNCE and SCHOOLS lists at
> >>>>> http://mail.ale.org/mailman/listinfo
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> >>
> >> _______________________________________________
> >> Ale mailing list
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> >
> > --
> > Damon
> > damon at damtek.com
> >
> > _______________________________________________
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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
>
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>

You can use a reverse < to pull data from a file as well, and I cannot
think of any other file-related operators.
sort < myfile -r > my-reverse-order-file

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