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Full Discussion: Using unset to delete array elements
Top Forums Shell Programming and Scripting Using unset to delete array elements Post 302250061 by msb65 on Wednesday 22nd of October 2008 04:21:50 PM
Old 10-22-2008
Using unset to delete array elements
Hi,

I am writing a BASH script. My questions regard deleting elements of arrays.

I have an array:
michael-browns-powerbook-g4-15:~ msb65$ test_array=(1 2 3 4)
michael-browns-powerbook-g4-15:~ msb65$ echo ${test_array[@]}
1 2 3 4

To delete the second element of test_array I type:
michael-browns-powerbook-g4-15:~ msb65$ unset test_array[1]
michael-browns-powerbook-g4-15:~ msb65$ echo ${test_array[@]}
1 3 4

I would like to again delete the second element (which is now 3). So I repeat the previous two lines of code:
michael-browns-powerbook-g4-15:~ msb65$ unset test_array[1]
michael-browns-powerbook-g4-15:~ msb65$ echo ${test_array[@]}
1 3 4

- Why is it that the second element was not deleted? Am I not deleting array elements properly?

Thanks.
Mike
 

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LEARN ABOUT DEBIAN

me-tv

ME 
TV(1)							   Me TV Manual 							  ME TV(1)

NAME

       me-tv - a digital television (DVB) viewer for GNOME

SYNOPSIS

       me-tv  [-?|--help]  [-v|--verbose]  [-s|--safe-mode]  [-m|--minimised]  [--disable-epg]	[--disable-epg-thread]	[--no-screensaver-inhibit]
       [--devices] [--read-timeout] [--display=DISPLAY]

DESCRIPTION

       Me TV is a GTK desktop application for watching digital television services that use the DVB standard.  Me TV works with DVB-T/C/S and ATSC
       cards that have kernel driver support.

       Me  TV  uses the xine video player to render its output onto its video window.  Me TV reads the Electronic Program Guide (EPG) data that is
       transmitted over the air to populate a built-in program guide which can be used for scheduling recordings.

       Me TV has a built-in scanner which can autoscan certain countries or use an initial scan file.

OPTIONS

       -?|--help
	      Show help options.

       -v|--verbose
	      Show verbose output.

       -s|--safe-mode
	      Show the preferences dialog an don't show video upon start.

       -m|--minimised-mode
	      Show minimised in notification area at startup.

       --disable-epg
	      Stops the rendering of the EPG event buttons on the UI.

       --disable-epg-thread
	      Disable the EPG thread.  Me TV will stop collecting EPG events.

       --no-screensaver-inhibit
	      Tells Me TV not to call the screensaver Inhibit/UnInhibit methods for GNOME Screensaver.

       --devices
	      Only use the specified frontend devices.	You can specify more  than  one  device  by  using  a  comma  or  colon  separator.  (e.g.
	      --devices=/dev/dvb/adapter0/frontend1)

       --read-timeout
	      How long to wait (in seconds) before timing out while waiting for data from demuxer (default 5)

       --display=DISPLAY
	      X display to use

AUTHOR

       Michael Lamothe (2007-2011) <michael.lamothe@gmail.com>.

COPYRIGHT

       Copyright (C) 2011 Michael Lamothe <michael.lamothe@gmail.com>.

1.3.6								    2011-01-20								  ME TV(1)
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