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)

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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)

Hi Folks
I have a file with the following sample input
919416586748,1200,31200
919416283619,3521,33521
919416811900,2440,64940
919416576012,13670,43670
Now i want to subtract the second value (where , is field separator) from the third value and display the output as follows
... (3 Replies)

Hi All,
I know there has been a lot of things that have been written about date arithmetic, but perhaps I have missed something..
The following script takes the input from a file name fail.txt with the following format:
CLASSDB 20060328122808
CPPARMS 20060814222056
Where $1 is a file name... (4 Replies)

Hi,
I need some help figuring this out, I think it can be done using awk but I don't know how.
So, I want to take two input files, subtract some columns with each other and then output to a new results file.
InFile1.txt
AAA 100 200 BBB
CCC 300 400 DDD
InFile2.txt
AAA 50 60 BBB
CCC 70... (7 Replies)

Hi Folks
I have tried awk command to conditionally add or subtract value from specific row in a file. The test file looks like:
# cat test.txt
cont x y
Max 0.3 0.9
Min 0.2 0.9
diff 0.1 0
# awk '{for (i=2; i <=NF; i++) if ($i== "0") $i=$i+0.2; print}' test.txt
Output:
cont... (1 Reply)

Hi All,
I have a file with thousands of lines in the following format, where
Field1=First 8 characters
Field2-9-16 characters
Field3=17-26 characters
I need to add Field 1 and Field2 and subtract the result from Field 3.
Field3=Field3 - (Field1 + Field2)
0012.00 0010.00 0001576.53... (4 Replies)

Hi
I want to perform arithmetic operations on output of `wc -l`.
for example
user046@sshell ~ $ ls -l
total 0
where "total 0" will increase one line in wc -l
filecount=`ls -l | wc -l`
here $filecount will be 1 but is should be 0
how to get rid of it ? (1 Reply)

My original post did not show up properly. I am trying again.
I have a simple tsch script that does some basic arithmetic. The calculated value was not producing the result I was expecting. I wrote a sample script to illustrate the things that I tried.
#!/bin/tcsh
@ count = 43
@... (3 Replies)

i am having a varialbe a , which is input to my file
i want to multiply this input with value .43, and assign it to variable b.
i tried it as below:
#!/bin/sh
a=$1
b=`expr $1\*0.43`
echo b=$b
error : expr: non-integer argument
Please tell me , how to do this.
Thanks (10 Replies)

Hello,
Im looking to help out my team by automating a simple search list. The user will look for a peering ip /30. For example 192.168.1.2/30 and gets the result. Im trying to get the entered /30 and subtract the last octet by one.
echo -n "Enter peering ip : "; read peeringip
cat... (3 Replies)