08-14-2013
dumb question, but what's the difference between the back quotes and parentheses?
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I have gotten the script up to this point and it works fine a system but when i copy it to another unix server running solaris 9 as the original one , its gives an error './mon_fs.sh: 0: unknown test operator' .
(see script bellow)
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3. Shell Programming and Scripting
hi
I get test: unknown operator status
if
then
echo "OK."
return 0
else
echo "not ok" 2>&1
exit -1
fi
I tried to change "A" with 'A' --> same error
I tried to change
if , I am getting: (3 Replies)
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4. Shell Programming and Scripting
Hi
I want to group
like this but syntactic is not right ...
Thanks
if
Like this below does not work properly ..
if
then
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Hi All,
can some one figure out the syntax issue here. How to overcome this?
#!/bin/sh
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$ PRP_MAIL=NO
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$ if && && ]; then
> echo "NO "
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test: unknown operator NO
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7. Shell Programming and Scripting
hi all, i am using the below command in my script
if ; then
This statement is causing the problme "ScriptName.ksh: XXX-XXX: unknown test operator"
could you please suggest me , how can i avoid these messages.
Singhal (7 Replies)
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9. Shell Programming and Scripting
Hi ,
Os - Solaris
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I am getting below error in if condition
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+
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LEARN ABOUT REDHAT
pnmpsnr
pnmpsnr(1) General Commands Manual pnmpsnr(1)
NAME
pnmpsnr - compute the difference between two images (the PSNR)
SYNOPSIS
pnmpsnr [pnmfile1] [pnmfile2]
DESCRIPTION
Reads two PBM, PGM, or PPM files, or PAM equivalents, as input. Prints the peak signal-to-noise ratio (PSNR) difference between the two
images. This metric is typically used in image compression papers to rate the distortion between original and decoded image.
If the inputs are PBM or PGM, pnmpsnr prints the PSNR of the luminance only. Otherwise, it prints the separate PSNRs of the luminance, and
chrominance (Cb and Cr) components of the colors.
The PSNR of a given component is the ratio of the mean square difference of the component for the two images to the maximum mean square
difference that can exist betwee any two images. It is expressed as a decibel value.
The mean square difference of a component for two images is the mean square difference of the component value, comparing each pixel with
the pixel in the same position of the other image. For the purposes of this computation, components are normalized to the scale [0..1].
The maximum mean square difference is identically 1.
So the higher the PSNR, the closer the images are. A luminance PSNR of 20 means the mean square difference of the luminances of the pixels
is 100 times less than the maximum possible difference, i.e. 0.01.
SEE ALSO
pnm(5)
04 March 2001 pnmpsnr(1)