set command overrides my ARGV array

2016-12-27 Thread Martin MOKREJŠ 

Hi,
  I wanted to enable error code reporting for piped processes. This should be doable by "set 
-o pipeline on". The problem is it kills my $* array and defines $1="on".



$ bash -x /tmp/a.sh arg1 arg2 arg3
+ for f in $*
+ echo arg1
arg1
+ for f in $*
+ echo arg2
arg2
+ for f in $*
+ echo arg3
arg3
+ set -o pipefail on
+ for f in $*
+ echo on
on
$



I can work around by storing a $* copy before fiddling with set command.

$ cat /tmp/a.sh
#! /bin/sh


for f in $* ; do
 echo $f
done

mybackup=$*

set -o pipefail on

for f in ${mybackup} ; do
 echo $f
done
$


$ bash -x /tmp/a.sh arg1 arg2 arg3
+ for f in $*
+ echo arg1
arg1
+ for f in $*
+ echo arg2
arg2
+ for f in $*
+ echo arg3
arg3
+ mybackup='arg1 arg2 arg3'
+ set -o pipefail on
+ for f in ${mybackup}
+ echo arg1
arg1
+ for f in ${mybackup}
+ echo arg2
arg2
+ for f in ${mybackup}
+ echo arg3
arg3
$



I am on Gentoo Linux:

# emerge -pv app-shells/bash

These are the packages that would be merged, in order:

Calculating dependencies... done!
[ebuild   R] app-shells/bash-4.4_p5-r1::gentoo  USE="net nls (readline) -afs 
-bashlogger -examples -mem-scramble -plugins" 0 KiB




Thank you for comments,
Martin

Re: set command overrides my ARGV array

2016-12-27 Thread Greg Wooledge 
On Tue, Dec 27, 2016 at 05:21:13PM +0100, Martin MOKREJ?? wrote:
> Hi,
>   I wanted to enable error code reporting for piped processes. This should 
>   be doable by "set -o pipeline on".

There is no such set -o keyword.  I think you're looking for
"set -o pipefail" instead.  (Note: there is no "on".  The -o means on.
If you use +o it means off.)

Re: set command overrides my ARGV array

2016-12-27 Thread Eric Blake 
On 12/27/2016 10:21 AM, Martin MOKREJŠ wrote:
> Hi,
>   I wanted to enable error code reporting for piped processes. This
> should be doable by "set -o pipeline on". The problem is it kills my $*
> array and defines $1="on".

That's because you used the wrong syntax.

'set -o pipefail' turns it on,
'set +o pipefail' turns it off

'set -o pipefail on' is the same as 'set -o pipefail; set on', which
turns it on but also changes $*.

-- 
Eric Blake   eblake redhat com+1-919-301-3266
Libvirt virtualization library http://libvirt.org



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Re: set command overrides my ARGV array

2016-12-27 Thread Grisha Levit 
The syntax is

set -o pipefail

to turn the option on and

set +o pipefail

to turn the option off. The word on is not part of the syntax.
​