array as loopvariable - howto

array as loopvariable - howto

[jarausch]

Hi

I would like to write a loop over a list of arrays,

e.g. I would like to iterate over pairs of (username,UID)

A naiv try like

for User in (User1,100) (User2,120); do  echo "$U[1] has UID $U[2]";
done

failed.
Is this possible in ZSH?

Many thanks for a hint,

Helmut Jarausch

Lehrstuhl fuer Numerische Mathematik
RWTH - Aachen University
D 52056 Aachen, Germany

RE: array as loopvariable - howto

[Borzenkov Andrey]

> 
> I would like to write a loop over a list of arrays,
> 
> e.g. I would like to iterate over pairs of (username,UID)
> 
> A naiv try like
> 
> for User in (User1,100) (User2,120); do  echo "$U[1] has UID $U[2]";
> done
> 
> failed.
> Is this possible in ZSH?
> 



For array variables what is wrong with

A=(user1 uid1 ...)
B=(user2 uid2 ...)

for user uid in $A $B; do
  echo User $user has $uid
done

for literal arrays just put them all in for loop

for user uid in user1 250 user2 350 ...

Or I do not understand your question?

-andrey

Re: array as loopvariable - howto

[Peter Stephenson]

jarausch@igpm.rwth-aachen.de wrote:
> I would like to write a loop over a list of arrays,
> 
> e.g. I would like to iterate over pairs of (username,UID)
> 
> A naiv try like
> 
> for User in (User1,100) (User2,120); do  echo "$U[1] has UID $U[2]";
> done
> 
> failed.
> Is this possible in ZSH?

>From 4.1.1 which is appearing Real Soon Now (TM) you can do

for User Uid in User1 100 User2 120; do
  echo "$User has UID $User2"
done

(You are encouraged to try out 4.1.1-test-2 if you are at all interested
in upgrading.)

Until then, you are stuck with either indexing multiple real arrays or
tricks with word splitting.

-- 
Peter Stephenson <pws@csr.com>                  Software Engineer
CSR Ltd., Science Park, Milton Road,
Cambridge, CB4 0WH, UK                          Tel: +44 (0)1223 692070


**********************************************************************
The information transmitted is intended only for the person or
entity to which it is addressed and may contain confidential 
and/or privileged material. 
Any review, retransmission, dissemination or other use of, or
taking of any action in reliance upon, this information by 
persons or entities other than the intended recipient is 
prohibited.  
If you received this in error, please contact the sender and 
delete the material from any computer.
**********************************************************************

Re: array as loopvariable - howto

[Peter Stephenson]

Peter Stephenson wrote:
> for User Uid in User1 100 User2 120; do
>   echo "$User has UID $User2"
                        ^^^^^^ This should be $Uid, obviously, sorry.
> done

-- 
Peter Stephenson <pws@csr.com>                  Software Engineer
CSR Ltd., Science Park, Milton Road,
Cambridge, CB4 0WH, UK                          Tel: +44 (0)1223 692070


**********************************************************************
The information transmitted is intended only for the person or
entity to which it is addressed and may contain confidential 
and/or privileged material. 
Any review, retransmission, dissemination or other use of, or
taking of any action in reliance upon, this information by 
persons or entities other than the intended recipient is 
prohibited.  
If you received this in error, please contact the sender and 
delete the material from any computer.
**********************************************************************

Upcoming (Was: array as loopvariable - howto)

[Geoff Wing]

Peter Stephenson <pws@csr.com> typed:
: From 4.1.1 which is appearing Real Soon Now (TM) you can do

Is this a promise?  Do you have holidays planned?  :-)

Regards,
Geoff

Re: array as loopvariable - howto

[Bart Schaefer]

On May 8, 11:58am, jarausch@igpm.rwth-aachen.de wrote:
} 
} for User in (User1,100) (User2,120); do  echo "$U[1] has UID $U[2]";
} done

I've seen responses on how to do this with the new multi-variable "for"
syntax in 4.1, but nothing about how to do it in 4.0.

I'd say the obvious solution is an associative array.

4.1 multi-variable "for":

for user uid in User1 100 User2 120 ...; do echo $user has UID $uid; done

4.0 or 4.1 associative array:

typeset -A umap; umap=( User1 100 User2 120 ... )
for user in ${(k)umap}; do echo $user has UID $umap[$user]; done