Alternative to cp command Post: 303018502

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Top Forums UNIX for Beginners Questions & Answers Alternative to cp command Post 303018502 by hicksd8 on Friday 8th of June 2018 03:35:49 AM

06-08-2018

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I think that I get the question as you've described it quite clearly. Different people will have different solutions but this is what I would do.

(Obviously, if the (original) copy takes several hours then users could be modifying files during that time so you need somehow to cope with that.)

Do the first copy using find piped to cpio and create a timestamp of the event:

Code:

# cd <source directory>
# date > timenow
# find . -depth -print | cpio -puvdm <destination directory>
# mv timenow timelastcopy

NOTE: The <destination directory> MUST already exist before the command is run otherwise it will fail, so create it manually if need be.

After the first copy, select only files that have changed since the last copy by using the -newer switch on find:

Code:

# cd <source directory>
# date > timenow
# find . -newer timelastcopy -depth -print | cpio -puvdm <destination directory>
# rm timelastcopy
# mv timenow timelastcopy

Note that we create the timestamp (timenow) before we start to copy because users might modify files whilst the copy is executing.

This way files that have not changed since before the very start of the last copy will not be copied again. The incremental copies will therefore be much quicker than a full copy. If the job fails to complete then the timelastcopy will not get updated so these files will get selected again on the next run.

Hope that helps and I hope I've explained that clear enough. If not, post back your questions.

Last edited by hicksd8; 06-08-2018 at 12:59 PM..

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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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