10-08-2011
Quote:
Originally Posted by
yazu
Nothing. It's a make's construction.
What does that mean?
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1. Shell Programming and Scripting
Hello
Does the unix korn shell provide a function to convert between number and string data-types
regards
Hrishy (1 Reply)
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Is there any restriction on number of parameters can be passed on to the shell script?
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In one of our internal scripts (unix.run), I have noticed that the following shebang.
#!/bin/sh -
for i in test1 test2 test3 ; do
.
.
.
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6. UNIX for Dummies Questions & Answers
Here's my work of testing whether a number input is perfect or not..
echo Enter a number
read no
i=1
ans=0
while
do
if
then
ans='expr $ans + $i'
fi
i='expr $i + 1'
done
if
then
echo $no is perfect
else
echo $no is NOT perfect
fi (12 Replies)
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Hello gurus,
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i m looking for something like this
call 3.1;
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8. Shell Programming and Scripting
Hi I am new in shell,
I am trying to create a small script that can do exit if a script is executed when argument not 2
#!/bin/sh
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I have one text file
1 2 3
a 5
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Hello Forum,
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LEARN ABOUT LINUX
ppmtopgm
ppmtopgm(1) General Commands Manual ppmtopgm(1)
NAME
ppmtopgm - convert a portable pixmap into a portable graymap
SYNOPSIS
ppmtopgm [ppmfile]
DESCRIPTION
Reads a portable pixmap as input. Produces a portable graymap as output. The output is a "black and white" rendering of the original
image, as in a black and white photograph. The quantization formula used is .299 r + .587 g + .114 b.
Note that although there is a pgmtoppm program, it is not necessary for simple conversions from pgm to ppm , because any ppm program can
read pgm (and pbm ) files automatically. pgmtoppm is for colorizing a pgm file. Also, see ppmtorgb3 for a different way of converting
color to gray. And ppmdist generates a grayscale image from a color image, but in a way that makes it easy to differentiate the original
colors, not necessarily a way that looks like a black and white photograph.
QUOTE
Cold-hearted orb that rules the night
Removes the colors from our sight
Red is gray, and yellow white
But we decide which is right
And which is a quantization error.
SEE ALSO
pgmtoppm(1),ppmtorgb3(1),rgb3toppm(1),ppmdist(1),ppm(5),pgm(5)
AUTHOR
Copyright (C) 1989 by Jef Poskanzer.
10 April 2000 ppmtopgm(1)