[ale] If there a neat way of peeling apart bash variable by delimters?

[Neal Rhodes]

Yes, I remember the IFS=, and the OIFS=$IFS, and then IFS=, and then put
it back, but was trying to not disturb the argument list by doing a set
statement, and it just reads so terribly.   

Thanks. 

On Mon, 2014-09-15 at 08:18 -0400, Ed Cashin wrote:

> Yes, Mike's right that you asked for a bash way and he gave you one.
> 
> If, though, you decide you would rather maintain compatibility with
> minimal POSIX shells that don't have full bash support, you can use
> the old-school Bourne shell features, $IFS and "set".  I think IFS
> stands for "internal field separator."
> 
> Just set the field separator to your field separator.  After calling
> "set" with the string to peel apart, the numbered variables will
> correspond to the peeled-apart fields.
> 
> In the transcript below I'm checking that it works in the Korn shell
> after verifying it in bash beforehand.
> 
>   bash$ PS1='ksh$ ' ksh
>   ksh$ name=First.Last
>   ksh$ IFS=.
>   ksh$ set $name
>   ksh$ echo $1
>   First
>   ksh$ echo $2
>   Last
>   ksh$ ^D
>   bash$
> 
> 
> 
> 
> On Sun, Sep 14, 2014 at 9:38 PM, Michael H. Warfield <mhw at wittsend.com> wrote:
> > On Sun, 2014-09-14 at 19:41 -0400, Neal Rhodes wrote:
> >> If in a shell script, you have a variable loaded with a character value,
> >> and there is a delimiter, and you want to peel it apart by that
> >> delimiter, is there a built-in expression to do that?
> >
> >> Here's what I'm doing, and I'm thinking there should be a better way.
> >
> >>         FULLNAME=$1                                  #eg:
> >> CustomerEntry.CreditLimit
> >>         DOT=`expr index $FULLNAME .`
> >>         DOTM1=`expr $DOT - 1`
> >>         TABLE=${FULLNAME:0:$DOTM1}
> >>         FIELD=${FULLNAME:$DOT:40}
> >
> > Yes there is.  You specifically said "bash" in the subject and in the
> > talks we've had a ALE and AUUG over "belts and suspenders bash" the
> > speaker mentioned using regex's in bash and accessing the underlying
> > substring results.  Look for BASH_REMATCH variables and the =~ operator
> > in the bash documentation.
> >
> > --
> > FOO=CustomerEntry.CreditLimit
> >
> > if [[ "${FOO}" =~ (.*)\.(.*) ]] ; then
> >         echo "${BASH_REMATCH[1]} : ${BASH_REMATCH[2]}"
> > else
> >         echo nope
> > fi
> >
> > CustomerEntry : CreditLimit
> > --
> >
> > Is that what you're after?
> >
> >> Neal Rhodes
> >> President, MNOP Ltd
> >> Lilburn, GA
> >> 770-972-5430
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> >
> > Regards,
> > Mike
> > --
> > Michael H. Warfield (AI4NB) | (770) 978-7061 |  mhw at WittsEnd.com
> >    /\/\|=mhw=|\/\/          | (678) 463-0932 |  http://www.wittsend.com/mhw/
> >    NIC whois: MHW9          | An optimist believes we live in the best of all
> >  PGP Key: 0x674627FF        | possible worlds.  A pessimist is sure of it!
> >
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> 


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