Multiple echos and cuts too slow Post: 302278096

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Top Forums Shell Programming and Scripting Multiple echos and cuts too slow Post 302278096 by dlam on Monday 19th of January 2009 09:14:42 AM

01-19-2009

Registered User

Multiple echos and cuts too slow

Hi guys, hopefully this hasn't been asked before - couldn't see the question anywhere.

I have a large number of timestamps (hh-mm-ss-millisecond)
that I need to find the difference between e.g.:

14-11-07-513
14-11-07-644

Now the script that I have just knocked up is horrifically slow, the crux of which is converting the hh, mm, dd into milliseconds:

(( TOTALTIMESTART= (`echo $var | cut -d'-' -f4-8 | cut -d'<' -f1 | cut -c1,2` * 3600000) + \
(`echo $var | cut -d'-' -f4-8 | cut -d'<' -f1 | cut -c4,5` * 60000) + \
(`echo $var | cut -d'-' -f4-8 | cut -d'<' -f1 | cut -c7,8` * 1000) + \
(`echo $var | cut -d'-' -f4-8 | cut -d'<' -f1 | cut -c10,11,12`) ))

Once done on two values it subtracts them from each other and usese the difference.

There is obviously a better way of doing the part above, but I can't think for the life of me what it would be.

Any thoughts?

dlam

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ncursesw5-config

ncursesw5-config(1)					      General Commands Manual					       ncursesw5-config(1)

NAME

       ncursesw5-config - helper script for ncurses libraries

SYNOPSIS

       ncursesw5-config [options]

DESCRIPTION

       This is a shell script which simplifies configuring applications against a particular set of ncurses libraries.

OPTIONS

       --prefix
	      echos the package-prefix of ncurses

       --exec-prefix
	      echos the executable-prefix of ncurses

       --cflags
	      echos the C compiler flags needed to compile with ncurses

       --libs echos the libraries needed to link with ncurses

       --version
	      echos the release+patchdate version of ncurses

       --abi-version
	      echos the ABI version of ncurses

       --mouse-version
	      echos the mouse-interface version of ncurses

       --bindir
	      echos the directory containing ncurses programs

       --datadir
	      echos the directory containing ncurses data

       --includedir
	      echos the directory containing ncurses header files

       --libdir
	      echos the directory containing ncurses libraries

       --mandir
	      echos the directory containing ncurses manpages

       --terminfo
	      echos the $TERMINFO terminfo database path, e.g.,
	      /usr/share/terminfo

       --terminfo-dirs
	      echos the $TERMINFO_DIRS directory list, e.g.,
	      /etc/terminfo:/usr/share/terminfo

       --termpath
	      echos the $TERMPATH termcap list, if support for termcap is configured.

       --help prints this message

SEE ALSO

       curses(3X)

       This describes ncurses version 5.9 (patch 20130511).

															       ncursesw5-config(1)