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Full Discussion: Appending variables
Top Forums Shell Programming and Scripting Appending variables Post 302262478 by mutex1 on Thursday 27th of November 2008 02:18:29 PM
Old 11-27-2008
Appending variables
Hi,

I'm having a problem with something I can't really figure out by myself. I've tried to do it with a for loop, but I'm pretty sure it won't work, if I'm not mistaken.

Basically, what I'm trying to do is test some variables and if any of them is not empty, add the values of these variables to the list. For example:

Code:
sub1="subtitle1.idx"
sub2=
sub3="subtitle3.idx"

for i in "$sub1" "$sub2" "$sub3"; do
    MP4SUBS="-add $i"
done

MP4Box -add video.h264 -add audio.aac $MP4SUBS

This does not work with a for loop, as you know. I know this can be done with an if conditional, but how do I deal if I have lots of sub* variables? An if conditional is not really recommended here, is it? Any suggestion how to do this in a simple way, if possible?

Thanks.
 

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rscript

Rscript(1)								FSF								Rscript(1)

NAME

       Rscript - front end for scripting with R

SYNOPSIS

       Rscript [--options] [-e expr] file [args]

DESCRIPTION

       A binary front-end to R, for use in scripting applications.

       expr   An optional expression to be evaluated, used in place of expr.

       file   Input file of R expressions

       args   Optional further arguments to be processed by commandArgs in the R interpreter.

OPTIONS

       --options accepted are

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       --version
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       --verbose
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       --default-packages=list
	      Where 'list' is a comma-separated set of package names, or 'NULL'

       and also options to R (in addition to --slave --no-restore), such as

       --save Do save workspace at the end of the session

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       --restore
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       --vanilla
	      Combine --no-save, --no-restore, --no-site-file --no-init-file and --no-environ

SEE ALSO

       R(1)

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