appending to perl array Post: 72811

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Top Forums UNIX for Dummies Questions & Answers appending to perl array Post 72811 by cbkihong on Tuesday 24th of May 2005 11:05:17 AM

05-24-2005

Registered User

Actually, to refer to ONE element of am array or a hash, you SHOULD use $ instead of @. Perl will generate a warning if you use @ for this case if you have warning turned on.

From the perldata manpage (near the top):

Quote:

Scalar values are always named with '$', even when referring to a scalar that is part of an array or a hash. The '$' symbol works semantically like the English word "the" in that it indicates a single value is expected.

Code:

 
    $days               # the simple scalar value "days"
    $days[28]           # the 29th element of array @days
    $days{'Feb'}        # the 'Feb' value from hash %days
    $#days              # the last index of array @days

Entire arrays (and slices of arrays and hashes) are denoted by ' @', which works much like the word "these" or "those" does in English, in that it indicates multiple values are expected.

Code:

 
    @days               # ($days[0], $days[1],... $days[n])
    @days[3,4,5]        # same as ($days[3],$days[4],$days[5])
    @days{'a','c'}      # same as ($days{'a'},$days{'c'})

cbkihong

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LEARN ABOUT DEBIAN

calendarserver_purge_events

CALENDARSERVER_PURGE_EVENTS(8)				    BSD System Manager's Manual 			    CALENDARSERVER_PURGE_EVENTS(8)

NAME

     calendarserver_purge_events -- Darwin Calendar Server event clean-up utility

SYNOPSIS

     calendarserver_purge_events [--config file] [--days number] [--dry-run] [--verbose] [--help]

DESCRIPTION

     calendarserver_purge_events is a tool for removing old events from the calendar server.  By default, events older than 365 days are removed,
     but the user can specify the number of days in the past to use as a cut-off.  Repeating events that have any occurrences after the cut-off
     day are not removed.

     calendarserver_purge_events should be run as a user with the same priviledges as the Calendar Server itself, as it needs to read and write
     data that belongs to the server.

OPTIONS

     -h, --help
	   Display usage information

     -f, --config FILE
	   Use the Calendar Server configuration specified in the given file.  Defaults to /etc/caldavd/caldavd.plist.

     -d, --days NUMBER
	   Specify how many days in the past to retain.  Defaults to 365 days.

     -n, --dry-run
	   Calculate and display how many events would be removed, but don't actually remove them.

     -v, --verbose
	   Print progress information.

FILES

     /etc/caldavd/caldavd.plist
	   The Calendar Server configuration file.

SEE ALSO

     caldavd(8)

BSD
								   June 17, 2009							       BSD

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