01-05-2009
trouble using read to store values in variables from command output
I know there are caveats about using read in pipelines because read is treated by a subshell. I know this but I can't think of any way to accomplish this regardless, I'm still a rookie.
I hope somebody will be able to interpret what it is that I'm trying to accomplish and correct me.
gist, trying to use output from command:
$ date -u '+%d %h %y' <enter>
05 Jan 09
##want to store 05 Jan 09 to variables DAY MONTH YEAR respectively; also want Jan to be all caps, so tr is used in pipeline##
$ date -u '+%d %h %y' | tr '[:lower:]' '[:upper:]' <enter>
05 JAN 09
##okay, so I got desired format for output, now I want those values stored, so just add a read command statement with the day month year as operands, right??##
$ date -u '+%d %h %y' | tr '[:lower:]' '[:upper:]' | read DAY MONTH YEAR <enter>
$ echo $DAY
$
##var DAY carries empty value--what am I doing wrong or what would be the correct way to achieve desired result of storing 05 JAN 09 output of date/tr commands to those variables??##
thanks in advance
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LEARN ABOUT DEBIAN
prima::calendar
Prima::Calendar(3) User Contributed Perl Documentation Prima::Calendar(3)
NAME
Prima::Calendar - standard calendar widget
SYNOPSIS
use Prima::Calendar;
my $cal = Prima::Calendar-> create(
useLocale => 1,
onChange => sub {
print $_[0]-> date_as_string, "
";
},
);
$cal-> date_from_time( localtime );
$cal-> month( 5);
DESCRIPTION
Provides interactive selection of date between 1900 and 2099 years. The main property, date, is a three-integer array, day, month, and
year, in the format of perl localtime ( see "localtime" in perlfunc ) - day can be in range from 1 to 31,month from 0 to 11, year from 0 to
199.
API
Events
Change
Called when the date property is changed.
Properties
date DAY, MONTH, YEAR
Accepts three integers in format of "localtime". DAY can be from 1 to 31, MONTH from 0 to 11, YEAR from 0 to 199.
Default value: today's date.
day INTEGER
Selects the day in month.
firstDayOfWeek INTEGER
Selects the first day of week, an integer between 0 and 6, where 0 is Sunday is the first day, 1 is Monday etc.
Default value: 0
month
Selects the month.
useLocale BOOLEAN
If 1, the locale-specific names of months and days of week are used. These are read by calling "POSIX::strftime". If invocation of
POSIX module fails, the property is automatically assigned to 0.
If 0, the English names of months and days of week are used.
Default value: 1
See also: date_as_string
year
Selects the year.
Methods
can_use_locale
Returns boolean value, whether the locale information can be retrieved by calling "strftime".
month2str MONTH
Returns MONTH name according to useLocale value.
make_months
Returns array of 12 month names according to useLocale value.
day_of_week DAY, MONTH, YEAR, [ USE_FIRST_DAY_OF_WEEK = 1 ]
Returns integer value, from 0 to 6, of the day of week on DAY, MONTH, YEAR date. If boolean USE_FIRST_DAY_OF_WEEK is set, the value of
"firstDayOfWeek" property is taken into the account, so 0 is a Sunday shifted forward by "firstDayOfWeek" days.
The switch from Julian to Gregorian calendar is ignored.
date_as_string [ DAY, MONTH, YEAR ]
Returns string representation of date on DAY, MONTH, YEAR according to useLocale property value.
date_from_time SEC, MIN, HOUR, M_DAY, MONTH, YEAR, ...
Copies date from "localtime" or "gmtime" result. This helper method allows the following syntax:
$calendar-> date_from_time( localtime( time));
AUTHOR
Dmitry Karasik, <dmitry@karasik.eu.org>.
SEE ALSO
Prima, Prima::Widget, POSIX, "localtime" in perlfunc, "time" in perlfunc, examples/calendar.pl.
perl v5.14.2 2009-02-24 Prima::Calendar(3)