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Full Discussion: perl replace awk strftime
Top Forums Shell Programming and Scripting perl replace awk strftime Post 302428101 by durden_tyler on Wednesday 9th of June 2010 12:15:57 AM
Old 06-09-2010
Quote:
Originally Posted by jimmy_y
Hi Everyone
i have a perl file below, one of the line is convert the pcho time to human readable format.

Code:
$value=`awk 'BEGIN{print strftime("%c",1273236600)}' | tr -d '\n'`;

if image, if i have lots of pcho time value in a file, if i use this awk, strftime, then tr -d to remove the \n, then assign it to the variable, this process is very slow.

any way to improve it? like perl has built in function, instead of `` the awk.

...
If you are looking for the equivalent of this -

Code:
awk 'BEGIN{print strftime("%c",1273236600)}'

in Perl, then you may want to use the "POSIX" module, which includes the strftime function -

Code:
perl -MPOSIX -le 'print POSIX::strftime("%c", localtime 1273236600)'

The POSIX module is part of Perl's standard distribution, atleast on *nix systems. Otherwise CPAN is your one-stop shop.

tyler_durden
This User Gave Thanks to durden_tyler For This Post:
jimmy_y
 

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LEARN ABOUT REDHAT

ppmtosixel

ppmtosixel(1)						      General Commands Manual						     ppmtosixel(1)

NAME

       ppmtosixel - convert a portable pixmap into DEC sixel format

SYNOPSIS

       ppmtosixel [-raw] [-margin] [ppmfile]

DESCRIPTION

       Reads  a  portable  pixmap  as input.  Produces sixel commands (SIX) as output.	The output is formatted for color printing, e.g. for a DEC
       LJ250 color inkjet printer.

       If RGB values from the PPM file do not have maxval=100, the RGB values are rescaled.  A printer control header and a color assignment table
       begin the SIX file.  Image data is written in a compressed format by default.  A printer control footer ends the image file.

OPTIONS

       -raw   If  specified,  each  pixel  will  be explicitly described in the image file.  If -raw is not specified, output will default to com-
	      pressed format in which identical adjacent pixels are replaced by "repeat pixel" commands.  A raw file is often an order	of  magni-
	      tude larger than a compressed file and prints much slower.

       -margin
	      If  -margin  is not specified, the image will be start at the left margin (of the window, paper, or whatever).  If -margin is speci-
	      fied, a 1.5 inch left margin will offset the image.

PRINTING

       Generally, sixel files must reach the printer unfiltered.  Use the lpr -x option or cat filename > /dev/tty0?.

BUGS

       Upon rescaling, truncation of the least significant bits of RGB values may result in poor color conversion.  If the original PPM maxval was
       greater	than  100,  rescaling  also reduces the image depth.  While the actual RGB values from the ppm file are more or less retained, the
       color palette of the LJ250 may not match the colors on your screen.  This seems to be a printer limitation.

SEE ALSO

       ppm(5)

AUTHOR

       Copyright (C) 1991 by Rick Vinci.

								   26 April 1991						     ppmtosixel(1)
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