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Full Discussion: until loop fails.
Top Forums Shell Programming and Scripting until loop fails. Post 302353777 by pludi on Wednesday 16th of September 2009 07:33:09 AM
Old 09-16-2009
Quote:
Originally Posted by yesmani
the one you ried doesn't work for me,, the "ps" itself stucks here. when i add it to my script that throws error taht the usage of ps is wrong..
My reply was based on what you've told us. Since you didn't tell us you OS, I can only guess, and used GNU ps.

Quote:
Originally Posted by yesmani
and moreover,, i am simple trying to print ".." until the bg process runs and then continue with the rest part of the script, simple like a status display on the screen,,
So you want something like "Launching abc.sh..."? That's not what your original code would have done (by intention, had it even compiled).

Putting a process into the background using '&' is a very very quick operation, and the PID will exist as soon as the shell finished processing the line. Meaning, no matter how big or long running abc.sh might be, the line 'abc.sh &' will return as soon as fork/exec is done (a tiny fraction of a second), and by that point there's a PID assigned to $!
 

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LEARN ABOUT SUNOS

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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