cc: [EMAIL PROTECTED]
Subject: Re: [ast-users] In-place file modification
--------
> Hi all,
>
> sometimes it would be convenient on the command line to modify files in-place,
> something like the -i option in perl. Perl first renames the original
> file to a temporary
> name or one with a specific extension appended and then writes stdout to a new
> file with the old name and the original file attributes.
>
> However, what I would find convenient, would be a 'delayed output operator'
> like
> e.g. >|| that would first create an exclusive temporary (dot-)file in
> the same directory
> and then when all data is written [and maybe fsync()ed], it is renamed to the
> actual given name and its attributes are set as expected for a new
> file. Kind of like
> it atomically shows up from nowhere at once after the old file is not
> needed anymore,
> and also nobody can access an incompletely written file by accident.
>
> Is there already such a mechanism that's convenient to use?
>
> Like that I could do
> $ nl myfile | iconv -fL1 -tUTF-8 >||myfile
> without having to type mv and rm.
>
>
> Thanks,
> Markus
Yes, this already exists, you can do
$ nl myfile | iconv -fL1 -tUTF-8 1<> myfile
<> opens the file for reading and writing. The default is file descriptor is 0.
tr [A-Z] [a-z] < file 1<> file
David Korn
[EMAIL PROTECTED]
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