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Top Forums Shell Programming and Scripting Checking if the files in a directory have a txt extension Post 302419201 by alister on Thursday 6th of May 2010 01:11:26 PM
Old 05-06-2010
Quote:
Originally Posted by itkamaraj
Code:
for i in `ls *.txt`; do 
echo "$i is text file";  ## do what ever you need here.. $i is the file name (txt file)
done

Never, ever do that. 'for i in *.txt' is safer and cheaper. Using ls and command substitution means that it's impossible to handle filenames with IFS characters (by default, spaces, tabs, and newlines). Also, if there are very many *.txt files in the directory, a command line length limit imposed by the exec system call may prevent the operating system from successfully launching ls; this is not an issue with the shell pattern glob as it does not require a new process.

Please pass along the cluestick thwack when you see someone else doing the same Smilie

Regards,
Alister
 

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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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