It's quite possible to have files belonging to users or groups with no corresponding entry in /etc/passwd or /etc/group, nothing prevents it. Anything with sufficient privileges can create files belonging to any ID and group whether represented by anything in passwd or group or not; those only control login permissions through the traditional login system.
All users and groups are just numbers anyway. If ls doesn't find matching entries in passwd and/or group it will just display numbers. As long as whatever login manager involved sets correct access permissions on login based on the relevant user and group numbers, and the numbers used internally and externally don't overlap, things can be kept consistent without knowing all names locally.
Last edited by Corona688; 05-27-2010 at 12:17 PM..
im running into changing the ownership of a file. I am trying to change the ownership to "system", but it doesn't want to work. I
sudo chown system /preferences.plist
Password:
chown: system: Invalid argument
is there a way to read the ownership of a file, something like
read chown... (3 Replies)
Hi Folks,
I know that changing users and groups is pretty basic admin, but this one has got me stumped. When I try to change the group of a file for which I am the owner for, it still gives me a 'Not owner' error.
For example, when I am logged in as 'webadmin', I have the following file:
... (4 Replies)
Hello,
I am on a mission to determine the user of file. I have used the ls -l command but it displays permission, link, user, group, etc, but I just want to display just the name of user of a specified file.
Many thanks (4 Replies)
hi,
how can I get the owner of the file ( not uid) on windows plaform.
"getpwuid" is not working on windows. I knw it works on unix.
Thanks. (2 Replies)
Hi all,
We have some files are under 744 permissions and the the owner is say owner1 and group1.
Now we have another user owner2 of group2, owner2 can remove files of the owner1 and the permission of those files are 744, unix admin told us he did some config at his side so we can do that.
... (14 Replies)
What i did:
- logged in with acc1 and created a new user acc2
commands used: useradd and passwd.
- Then i logged in acc2. but all the files are owned by acc1.
Issue: I try to change the owner of the files using chown command . But it gives me a error message.
All i want to do is... (13 Replies)
i need to do the following operations in solaris 10:
1.change owner and group owner for files which are not owned by the current user and user group
2.to can delete files in the /tmp directory which are not of the current user
3. allow to a standard user the deletion of files in the /tmp... (1 Reply)
hi everyone,
We've generated mpstat.out file monitoring cpu utilization and the file is ready now.Wanted to generate graphical charts for the same output data.
Can anyone pleas suggest tool for the same.? (1 Reply)
Discussion started by: Kathraji
1 Replies
LEARN ABOUT REDHAT
ppmtosixel
ppmtosixel(1) General Commands Manual ppmtosixel(1)NAME
ppmtosixel - convert a portable pixmap into DEC sixel format
SYNOPSIS
ppmtosixel [-raw] [-margin] [ppmfile]
DESCRIPTION
Reads a portable pixmap as input. Produces sixel commands (SIX) as output. The output is formatted for color printing, e.g. for a DEC
LJ250 color inkjet printer.
If RGB values from the PPM file do not have maxval=100, the RGB values are rescaled. A printer control header and a color assignment table
begin the SIX file. Image data is written in a compressed format by default. A printer control footer ends the image file.
OPTIONS -raw If specified, each pixel will be explicitly described in the image file. If -raw is not specified, output will default to com-
pressed format in which identical adjacent pixels are replaced by "repeat pixel" commands. A raw file is often an order of magni-
tude larger than a compressed file and prints much slower.
-margin
If -margin is not specified, the image will be start at the left margin (of the window, paper, or whatever). If -margin is speci-
fied, a 1.5 inch left margin will offset the image.
PRINTING
Generally, sixel files must reach the printer unfiltered. Use the lpr -x option or cat filename > /dev/tty0?.
BUGS
Upon rescaling, truncation of the least significant bits of RGB values may result in poor color conversion. If the original PPM maxval was
greater than 100, rescaling also reduces the image depth. While the actual RGB values from the ppm file are more or less retained, the
color palette of the LJ250 may not match the colors on your screen. This seems to be a printer limitation.
SEE ALSO ppm(5)AUTHOR
Copyright (C) 1991 by Rick Vinci.
26 April 1991 ppmtosixel(1)