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Full Discussion: Loop to move files in different directories
Top Forums Shell Programming and Scripting Loop to move files in different directories Post 302460290 by DGPickett on Wednesday 6th of October 2010 11:20:29 AM
Old 10-06-2010
BTW: I hardly ever cd, even in scripts, as I found it hindered my productivity and led to errors. The problem with cd is then, commands are not reusable. The cd is really a typing shorthand. Effectively, it is in competition with command recall. Absolute paths are not much of a burden if they are not typed. UNIX ksh life was more consistent, error-free, better if I used X cut/paste, command recall & editing: set -o vi/viraw w/export HISTSIZE=32767, even archiving .sh_history occasionally for my tools that recall history. I even wrote a vi wrapper so my xterm scroll history (also set real big) was not overwritten and the return is always zero (so results are not discarded). Since I never leave $HOME, I can use relative paths for all common things, some through my own sym-links, and absolute for things less frequent. All my history is rerunnable. If it needs cd, I do: (cd ... ; .... )

---------- Post updated at 11:20 AM ---------- Previous update was at 11:12 AM ----------

My solution moves one dir at a time, not one file, which might be a bit faster and lower overhead.

It also ensures the target is present. It does not check to see if the source files are present, but that is not worth scripting or easy to script cheaply.

If you get a huge dir, when someone allows too many files to expand the directory inode, the speed difference is very substantial. With my plan, you are going to traverse that directory:
  1. once in find to find the archive/,
  2. once in ksh to find the source files for the mv command line, and then
  3. once (for every file?) inside mv to find the archive\
  4. once for every file inside mv, but just far enough through the directory to find that file and overwrite that part of the directory.
 

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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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