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Full Discussion: Different values output between du and df
Top Forums UNIX for Dummies Questions & Answers Different values output between du and df Post 302933347 by orma on Thursday 29th of January 2015 01:25:00 PM
Old 01-29-2015
Different values output between du and df
Dear Gurus

I have a doubt:

Why df -h command shows me that /opt FS has used 3.0G:
Code:
# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
                      9.7G  5.8G  3.5G  63% /
/dev/mapper/VolGroup00-LogVol05
                      226G  171G   45G  80% /var
/dev/mapper/VolGroup00-LogVol04
                      496M   19M  452M   4% /tmp
/dev/mapper/VolGroup00-LogVol03
                      496M  101M  370M  22% /home
/dev/mapper/VolGroup00-LogVol02
                       25G  3.0G   21G  13% /opt

but du -ch /opt shows me a Total of 49G

Code:
# du -ch /opt
...
94M    /opt/java/j2sdk1.4.2_12
477M    /opt/java
49G    /opt
49G    total

?

What is real amount of used space into /opt: 49G or 3G ?

Thank you so much in advance for your time and support.

Best regards,

Orma
Last edited by joeyg; 01-29-2015 at 04:55 PM.. Reason: Please wrap commands and data in CodeTags
 

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LEARN ABOUT MINIX

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)
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