Hi ,
I am using SUN OS Version 5.6.
I have a file that contains records of length 270. when I do 'set nu' in vi editor, I get the count as 86. whereas when I do "wc -l" on the command prompt, it shows the count as only 85. this is very strange. why would the 'wc' show 1 record less. The job... (3 Replies)
First time poster -
I have a huge file and i want to sort and compress it to something more readable
Ex:
FUTNCA01-SL1 DMT8a4 5 3
FUTNCA01-SL1 DMT8a4 5 9
FUTNCA01-SL1 DMT8a4 5 21
FUTNCA01-SL1 DMT8a4 5 22
FUTNCA01-SL1 DMT8a4 5 23
FUTNCA01-SL1 DMT8a4 5 24
FUTNCA01-SL1 DMT8a4 6 2... (13 Replies)
Hi all,
I have a requirement for a script to find out the increase in memory. We have a log native_stderr.log where this will log.
bash-2.05$ tail -40 native_stderr.log | grep ': freed'
<GC(4140): freed 168190456 bytes, 66% free (180990488/271776256), in 253 ms>
<GC(4141): freed... (4 Replies)
13608:End of Tests.
13811:End of Tests.
14014:End of Tests.
14217:End of Tests.
14420:End of Tests.
14623:End of Tests.
14826:End of Tests.
15029:End of Tests.
15232:End of Tests.
15435:End of Tests.
15638:End of Tests.
i have file like above. i want difference betwwn first field of... (2 Replies)
Is there a way to show the first 4 lines of a file without using head -4?
In sed would it be sed '1,4d' ?
What if I just wanted to display the 2nd line ONLY?
How could this be done with AWK?...correctly with SED? (6 Replies)
Hi all,
I am using the below code to ping a code and print whehter the connection is successful or not.
use Net::Ping;
$p = Net::Ping->new();
my $host = "x.x.x.x";
# print "$host is alive.\n" if $p->ping($host);
if ($p->ping($host,3))
{
print... (0 Replies)
Hi Guys,
What is difference between this two lines in script
logger -p daemon.info -t postback Starting /opt/local/bin/backup-report
and
/opt/local/bin/backup-report
is the backu script running twice here?
Thanks, (2 Replies)
GM,
I have an issue at work, which requires a simple solution. But, after multiple attempts, I have not been able to hit on the code needed.
I am assuming that sed, awk or even perl could do what I need.
I have an application that adds extra blank page feeds, for multiple reports, when... (7 Replies)
i grepped the time stamp in a file as given below
now i need to calculate time difference
file data:
18:29:10
22:15:50 (5 Replies)
Discussion started by: vivekn
5 Replies
LEARN ABOUT DEBIAN
pnmpsnr
pnmpsnr(1) General Commands Manual pnmpsnr(1)NAME
pnmpsnr - compute the difference between two portable anymaps
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)