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From: Lao Ming on 30 Mar 2010 14:26
On Mar 29, 11:29 pm, Bill Marcum <marcumb...(a)bellsouth.net> wrote:
> On 2010-03-30, Lao Ming <laoming...(a)gmail.com> wrote:
>
>
>
>
>
> > In the loop, I append a format string to a variable called format:
>
> >    format="$format %s"
>
> > When the loop completes, I prepend and append quotes and newline.
>
> >    q='"'
> >    format="${q}${format}\\n${q}"
>
> > When I echo that format, it has the correct number of months but when
> > I printf it, I get null.
>
> >    printf "$format" "$month_args"
>
> > What did I do wrong?  Thanks a bunch.
>
> Does your loop have its input or output redirected? If so, the loop is
> executed in a subshell.

It doesn't seem to be an issue with the output since I do obtain
correct output -- just not formatted output because some simple
problem which I can't see is affecting the format variable. If the
subshell affects the format variable below, shouldn't it also affect
the accompanying monthly_args variable as well? It must something
else I've done or not done.

Is there a good source on the web for reading about subshells? While
I understand the issue, I have never fully understood every aspect of
it.

Sorry for bothering you all with what seems to be a trivial issue. I
should have been able to figure it out by myself. Thanks.



for mm in 01 02 03 04 05 06 07 08 09 10 11 12
do
if [ "$mm" -le "$current_mm" ]
then
kmonthly=`./kdaily "$yyyy" |grep "^${yy}${mm}" |grep -w "k" |wc -
l`

format="$format %s"
monthly_args="$monthly_args $k_monthly"

fi
done
format="\"${format}\\n\""

printf "$format" $monthly_args


As to using a variable instead of \" -- all I can say is old habits
die hard. :)

From: Janis Papanagnou on 30 Mar 2010 15:40
Lao Ming schrieb:
> On Mar 29, 11:29 pm, Bill Marcum <marcumb...(a)bellsouth.net> wrote:
>> On 2010-03-30, Lao Ming <laoming...(a)gmail.com> wrote:
>>
>>
>>
>>
>>
>>> In the loop, I append a format string to a variable called format:
>>> format="$format %s"
>>> When the loop completes, I prepend and append quotes and newline.
>>> q='"'
>>> format="${q}${format}\\n${q}"
>>> When I echo that format, it has the correct number of months but when
>>> I printf it, I get null.
>>> printf "$format" "$month_args"
>>> What did I do wrong? Thanks a bunch.
>> Does your loop have its input or output redirected? If so, the loop is
>> executed in a subshell.
>
> It doesn't seem to be an issue with the output since I do obtain
> correct output -- just not formatted output because some simple
> problem which I can't see is affecting the format variable. If the
> subshell affects the format variable below, shouldn't it also affect
> the accompanying monthly_args variable as well? It must something
> else I've done or not done.
>
> Is there a good source on the web for reading about subshells? While
> I understand the issue, I have never fully understood every aspect of
> it.
>
> Sorry for bothering you all with what seems to be a trivial issue. I
> should have been able to figure it out by myself. Thanks.

Helpful information to be able to help you is; meaningful sample input
data, and expected output (of course correlating to your sample input).
Please provide that information and I'm sure there's a simple solution.

>
> [snip some code]

Posting code is indeed helpful if it's clear what you want to achieve.
Analysing such 'any_tool|grep|grep|wc' sequences is boring. We don't
know what 'any_tool' will produce and bulky grep|grep|wc sequences are
mostly unnecessary, anyway.

Janis

>
> As to using a variable instead of \" -- all I can say is old habits
> die hard. :)
>
From: Bill Marcum on 30 Mar 2010 18:53
On 2010-03-30, Lao Ming <laomingliu(a)gmail.com> wrote:
>
> Sorry for bothering you all with what seems to be a trivial issue. I
> should have been able to figure it out by myself. Thanks.
>
>
>
> for mm in 01 02 03 04 05 06 07 08 09 10 11 12
> do
> if [ "$mm" -le "$current_mm" ]
> then
> kmonthly=`./kdaily "$yyyy" |grep "^${yy}${mm}" |grep -w "k" |wc -
> l`
>
> format="$format %s"
> monthly_args="$monthly_args $k_monthly"
>
> fi
> done
> format="\"${format}\\n\""
>
> printf "$format" $monthly_args
>
You have "kmonthly" in one place and "$k_monthly" in another.



--
THEY'RE IN UR BED, EATING UR DREAMZ
From: Lao Ming on 30 Mar 2010 22:36
On Mar 30, 12:40 pm, Janis Papanagnou <janis_papanag...(a)hotmail.com>
wrote:
> Lao Ming schrieb:
>
>
>
>
>
> > On Mar 29, 11:29 pm, Bill Marcum <marcumb...(a)bellsouth.net> wrote:
> >> On 2010-03-30, Lao Ming <laoming...(a)gmail.com> wrote:
>
> >>> In the loop, I append a format string to a variable called format:
> >>>    format="$format %s"
> >>> When the loop completes, I prepend and append quotes and newline.
> >>>    q='"'
> >>>    format="${q}${format}\\n${q}"
> >>> When I echo that format, it has the correct number of months but when
> >>> I printf it, I get null.
> >>>    printf "$format" "$month_args"
> >>> What did I do wrong?  Thanks a bunch.
> >> Does your loop have its input or output redirected? If so, the loop is
> >> executed in a subshell.
>
> > It doesn't seem to be an issue with the output since I do obtain
> > correct output -- just not formatted output because some simple
> > problem which I can't see is affecting the format variable.  If the
> > subshell affects the format variable below, shouldn't it also affect
> > the accompanying monthly_args variable as well?  It must something
> > else I've done or not done.
>
> > Is there a good source on the web for reading about subshells?  While
> > I understand the issue, I have never fully understood every aspect of
> > it.
>
> > Sorry for bothering you all with what seems to be a trivial issue.  I
> > should have been able to figure it out by myself.  Thanks.
>
> Helpful information to be able to help you is; meaningful sample input
> data, and expected output (of course correlating to your sample input).
> Please provide that information and I'm sure there's a simple solution.
>
>
>
> > [snip some code]
>
> Posting code is indeed helpful if it's clear what you want to achieve.
> Analysing such 'any_tool|grep|grep|wc' sequences is boring.

I agree it is boring but I'm sure you recognize that 'wc -l' is only
going
to produce non-negative integers. If I introduced the other script
(kdaily)
or the data to be searched ... now *that* would be boring. My only
issue
is formatting the format strings -- nothing else. :)

> We don't
> know what 'any_tool' will produce and bulky grep|grep|wc sequences are
> mostly unnecessary, anyway.

They're only unnecessary if you know a better way which, admittedly, I
do not.
Hopefully, I am not sounding unappreciative because, be assured, I am
sincerely appreciative.



From: Lao Ming on 30 Mar 2010 22:39
On Mar 30, 3:53 pm, Bill Marcum <marcumb...(a)bellsouth.net> wrote:
> On 2010-03-30, Lao Ming <laoming...(a)gmail.com> wrote:
>
>
>
>
>
> > Sorry for bothering you all with what seems to be a trivial issue.  I
> > should have been able to figure it out by myself.  Thanks.
>
> > for mm in 01 02 03 04 05 06 07 08 09 10 11 12
> > do
> >    if [ "$mm" -le "$current_mm" ]
> >    then
> >       kmonthly=`./kdaily "$yyyy" |grep "^${yy}${mm}" |grep -w "k" |wc -
> > l`
>
> >        format="$format %s"
> >       monthly_args="$monthly_args $k_monthly"
>
> >    fi
> > done
> > format="\"${format}\\n\""
>
> > printf "$format" $monthly_args
>
> You have "kmonthly" in one place and "$k_monthly" in another.

Sorry. It was just an inadvertent modification.
It doesn't affect the output.

To try to determine the issue, I decided to skirt the
build of the format strings and entered the format strings
as a series of 12 format strings ( %3d repeated 12 times ).
That worked fine so I decided to just stick with that.

Thanks.
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