Writing files without temporary files Post: 302308284

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Top Forums Shell Programming and Scripting Writing files without temporary files Post 302308284 by bashshadow1979 on Friday 17th of April 2009 03:17:41 PM

04-17-2009

Registered User

Writing files without temporary files

Hey Guys,

I was wondering if someone would give me a hand with an issue I'm having, let me explain the situation:

I have a file that is constantly being written to and read from with updated lines:

# cat activity.file
activity1
activity2
activity3
activity4
activity5

This file should never have more than 60 lines of text, so the "writing" process is as follows:

# tail -59 activity.file > temp; mv temp activity.file; echo "activityN" >> activity.file

Basically what this does is:

1.- Gets the bottom 59 files of activity.file into a temp file
2.- Renames the temp file into the original filename ( activity.file )
3.- Appends the new data in the bottom of the activity file.

So far this works great, but I'm trying to find a way to do the same procedure but without utilizing a temp file, as a "one-liner" as they say..

I tried the following:

tail -59 activity.file > activity.file ; echo "activityN" >> activity.file

But that didn't work...

Any ideas would be greatly appreciated

Thanks

bashshadow1979

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LEARN ABOUT DEBIAN

gnome-activity-journal

GNOME-ACTIVITY-JOURNAL(1)				      General Commands Manual					 GNOME-ACTIVITY-JOURNAL(1)

NAME

       gnome-activity-journal - browse and search a chronological log of your activities

SYNOPSIS

       gnome-activity-journal [OPTIONS]

DESCRIPTION

       gnome-activity-journal  is  a  tool  for  easily  browsing and finding files on your computer. It shows a chronological journal of all file
       activity and supports full-text search through Tracker.

OPTIONS

       The program follows the usual GNU command line syntax, with options starting with two dashes (`--').  A	summary  of  options  is  included
       below.

       --version
	      Shows the version number and exits.

       -h, --help
	      Shows a short help message listing all supported options and exits.

       --debug
	      Prints additional debug information.

SEE ALSO

       zeitgeist-daemon, tracker-store

BUGS

       Please report any bugs on https://bugs.launchpad.net/gnome-activity-journal.

AUTHORS

       Please see the AUTHORS file bundled with this application  for  a  complete list of contributors.

LICENSE

       This  program  is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by
       the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

       This program is distributed in the hope that it will be useful, but WITHOUT ANY	WARRANTY;  without  even  the  implied	warranty  of  MER-
       CHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.

       You should have received a copy of the GNU General Public License along with this program.  If not, see <http://www.gnu.org/licenses/>.

								 January 19, 2010					 GNOME-ACTIVITY-JOURNAL(1)