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tee vs output redirection confusion
Post 302299916 by c_d on Sunday 22nd of March 2009 07:15:59 AM
03-22-2009
Quote:
command1 && command2
First, command1 is run. Then if it does an "exit 0" or equivalent, then command2 is run. If command1 reports that it failed, then we just stop.
Shells are written in C and they use system calls to do stuff. fork() and exec() are system calls. The exec() system call is the model for the exec shell command. I was referring to the system calls being invoked.
First, command1 is run. Then if it does an "exit 0" or equivalent, then command2 is run. If command1 reports that it failed, then we just stop.
Shells are written in C and they use system calls to do stuff. fork() and exec() are system calls. The exec() system call is the model for the exec shell command. I was referring to the system calls being invoked.
but what seems like art to you, is like cipher text to me...
please explain radoulov's command...|
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LEARN ABOUT REDHAT
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)