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Full Discussion: Deleting file basing on the timestamp substring in the file name
Top Forums UNIX for Dummies Questions & Answers Deleting file basing on the timestamp substring in the file name Post 302888740 by bakunin on Monday 17th of February 2014 06:19:53 AM
Old 02-17-2014
Quote:
Originally Posted by thuyetti
Hello,
I have in my backup folder, files with names convention like this :
randomFileNames_13-02-2014_23h13m09+1392333189
randomFileNames_14-02-2014_02h13m09+1392343989
randomFileNames_14-02-2014_04h13m09+1392351189
etc....

Base on timestamp at end of the filename, I would to delete all the files which are older than 10 days.
I prefer to base on the timestamp in the file name end NOT on -mtime because those backup files can be access any time for reading.
Thanks for your reading and helps.
Thibault
Hmmm....

You mean something like:

Code:
filename="randomFileNames_13-02-2014_23h13m09+1392333189"
# print - "${filename#*+}"
1392333189

This is based on the assumption that "randomFileNames" will not contain the character "+", otherwise the above might get ambiguous. You might use the above in a manner like:

Code:
ls -1 /path/to/backupdir | while read FILE ; do
     TS="${FILE#*+}"
     if [ $TS -gt $some_int -a $TS -lt $other_int ] ; then   # i.e. range check
          some_command "$FILE"
     fi
done

I hope this helps.

bakunin
 

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LEARN ABOUT DEBIAN

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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