Re: [OT] Bash Script Help

[Colin Ingram <synergizedmusic@gmail.com>]

Almut Behrens wrote:

> On Mon, May 23, 2005 at 04:17:44PM -0500, Colin Ingram wrote:
>  
>
> > (...)
> >
> > this creates a file that looks like this:
> > 00:00.000, 3.24557e+007
> > 00:02.510, 3.23482e+007
> > 00:05.007, 3.24578e+007
> > 00:07.507, 2.77091e+007
> > ---snip---
> >
> > I now need to covert the "elapse time" column from the string format 
> > "hours:min:sec" to a column containing just seconds.  I am unsure how to 
> > do this.  Can I use command substitution in a sed substitute command?
> >    
>
> You could pipe the output of your script through the following perl
> command:
>
>  ... | perl -pe 's/^(\d+):(\d+):(\d+)/$1*60**2 + $2*60 + $3/e'
>
> in case the time string represents "hours:min:sec".
> If it's "min:sec.msec" (looks like it to me...), then it'd be
>
>  
its actually "[hours]:min:sec" (the secs have ms precision).  I assume I 
can make the first subexpression match zero or one time.  In that 
situation if the first subexpression doesn't match does $1=null?

>  ... | perl -pe 's/^(\d+):([\d.]+)/$1*60 + $2/e'
>
> The s///e option requests command subtitution, where the value can be
> any perl code, the result of which will be the replacement string.
>  
I'll look into this some more.  Thanks for the suggestion