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converting string to number in shell script
Post 302600842 by turki_00 on Wednesday 22nd of February 2012 08:32:38 AM
02-22-2012
converting string to number in shell script
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LEARN ABOUT MINIX
pnmarith
pnmarith(1) General Commands Manual pnmarith(1) NAME
pnmarith - perform arithmetic on two portable anymaps SYNOPSIS
pnmarith -add|-subtract|-multiply|-difference|-minimum|-maximum. pnmfile1 pnmfile2 DESCRIPTION
Reads two portable anymaps as input. Performs the specified arithmetic operation, and produces a portable anymap as output. The two input anymaps must be the same width and height. The arithmetic is performed between corresponding pixels in the two anymaps, as if maxval was 1.0, black was 0.0, and a linear scale in between. Results that fall outside of [0..1) are truncated. The operator -difference calculates the absolute value of pnmarith -subtract pnmfile1 pnmfile2, i.e. no truncation is done. All flags can be abbreviated to their shortest unique prefix. SEE ALSO
pbmmask(1), pnmpaste(1), pnminvert(1), pnm(5) AUTHOR
Copyright (C) 1989, 1991 by Jef Poskanzer. Lightly modified by Marcel Wijkstra <wijkstra@fwi.uva.nl> 26 August 1993 pnmarith(1)