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Full Discussion: Calculating the epoch time from standard time using awk and calculating the duration
Top Forums Shell Programming and Scripting Calculating the epoch time from standard time using awk and calculating the duration Post 302645019 by balajesuri on Wednesday 23rd of May 2012 01:11:59 AM
Old 05-23-2012
Code:
[root@host dir]# cat input
Date TimeStamp
05/23/2012 08:30:11.250
05/23/2012 08:30:15.500
05/23/2012 08:31:15.500
[root@host dir]# cat test.sh
#! /bin/bash

line=1
while IFS=. read x y
do
    if [ $line -eq 1 ]
    then
        (( line++ ))
        continue
    elif [ $line -eq 2 ]
    then
        refTime=$((($(date -d "$x" +%s) * 1000) + $y))
        echo "0.000"
        (( line++ ))
    else
        time=$((($(date -d "$x" +%s) * 1000) + $y))
        echo "scale=3; ($time - $refTime) / 1000" | bc -l
        (( line++ ))
    fi
done < input
[root@host dir]# ./test.sh
0.000
4.250
64.250
[root@host dir]#

Of course, you need GNU date and the bench calculator.
 

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GRUB-RENDER-LABEL(1)                                               User Commands                                              GRUB-RENDER-LABEL(1)

NAME

       grub-render-label - generate a .disk_label for Apple Macs.

SYNOPSIS

       grub-render-label [OPTION...] [OPTIONS]

DESCRIPTION

       Render Apple .disk_label.

       -b, --bgcolor=COLOR
              use COLOR for background

       -c, --color=COLOR
              use COLOR for text

       -f, --font=FILE
              use FILE as font (PF2).

       -i, --input=FILE
              read text from FILE.

       -o, --output=FILE
              set output filename. Default is STDOUT

       -t, --text=STRING
              set the label to render

       -v, --verbose
              print verbose messages.

       -?, --help
              give this help list

       --usage
              give a short usage message

       -V, --version
              print program version

       Mandatory or optional arguments to long options are also mandatory or optional for any corresponding short options.

REPORTING BUGS

       Report bugs to <bug-grub@gnu.org>.

SEE ALSO

       The  full  documentation  for grub-render-label is maintained as a Texinfo manual.  If the info and grub-render-label programs are properly
       installed at your site, the command

              info grub-render-label

       should give you access to the complete manual.

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