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Top Forums Shell Programming and Scripting What is the purpose of "-z" string checking? Post 302852597 by learnbash on Thursday 12th of September 2013 01:34:39 AM
Old 09-12-2013
What is the purpose of "-z" string checking?

what is the purpose of below specially "-z" string checking, how?

Code:
pid=`ps ax |grep java`
 
if [ ! -z $pid ]

 

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Gtk2::PageSetup(3pm)					User Contributed Perl Documentation				      Gtk2::PageSetup(3pm)

NAME
Gtk2::PageSetup - wrapper for GtkPageSetup HIERARCHY
Glib::Object +----Gtk2::PageSetup METHODS
pagesetup = Gtk2::PageSetup->new pagesetup = Gtk2::PageSetup->new_from_file ($file_name) o $file_name (localized file name) May croak with a Glib::Error in $@ on failure. Since: gtk+ 2.12 pagesetup = Gtk2::PageSetup->new_from_key_file ($key_file, $group_name) o $key_file (Glib::KeyFile) o $group_name (string or undef) May croak with a Glib::Error in $@ on failure. Since: gtk+ 2.12 double = $setup->get_bottom_margin ($unit) o $unit (Gtk2::Unit) $setup->set_bottom_margin ($margin, $unit) o $margin (double) o $unit (Gtk2::Unit) double = $setup->get_left_margin ($unit) o $unit (Gtk2::Unit) $setup->set_left_margin ($margin, $unit) o $margin (double) o $unit (Gtk2::Unit) $setup->load_file ($file_name) o $file_name (string) May croak with a Glib::Error in $@ on failure. Since: gtk+ 2.14 $setup->load_key_file ($key_file, $group_name) o $key_file (Glib::KeyFile) o $group_name (string or undef) May croak with a Glib::Error in $@ on failure. Since: gtk+ 2.14 pageorientation = $setup->get_orientation $setup->set_orientation ($orientation) o $orientation (Gtk2::PageOrientation) double = $setup->get_page_height ($unit) o $unit (Gtk2::Unit) double = $setup->get_page_width ($unit) o $unit (Gtk2::Unit) double = $setup->get_paper_height ($unit) o $unit (Gtk2::Unit) $setup->set_paper_size_and_default_margins ($size) o $size (Gtk2::PaperSize) papersize = $setup->get_paper_size $setup->set_paper_size ($size) o $size (Gtk2::PaperSize) double = $setup->get_paper_width ($unit) o $unit (Gtk2::Unit) double = $setup->get_right_margin ($unit) o $unit (Gtk2::Unit) $setup->set_right_margin ($margin, $unit) o $margin (double) o $unit (Gtk2::Unit) $setup->to_file ($file_name) o $file_name (localized file name) May croak with a Glib::Error in $@ on failure. Since: gtk+ 2.12 $setup->to_key_file ($key_file, $group_name) o $key_file (Glib::KeyFile) o $group_name (string or undef) Since: gtk+ 2.12 double = $setup->get_top_margin ($unit) o $unit (Gtk2::Unit) $setup->set_top_margin ($margin, $unit) o $margin (double) o $unit (Gtk2::Unit) ENUMS AND FLAGS
enum Gtk2::PageOrientation o 'portrait' / 'GTK_PAGE_ORIENTATION_PORTRAIT' o 'landscape' / 'GTK_PAGE_ORIENTATION_LANDSCAPE' o 'reverse-portrait' / 'GTK_PAGE_ORIENTATION_REVERSE_PORTRAIT' o 'reverse-landscape' / 'GTK_PAGE_ORIENTATION_REVERSE_LANDSCAPE' enum Gtk2::Unit o 'pixel' / 'GTK_UNIT_PIXEL' o 'points' / 'GTK_UNIT_POINTS' o 'inch' / 'GTK_UNIT_INCH' o 'mm' / 'GTK_UNIT_MM' SEE ALSO
Gtk2, Glib::Object COPYRIGHT
Copyright (C) 2003-2011 by the gtk2-perl team. This software is licensed under the LGPL. See Gtk2 for a full notice. perl v5.14.2 2012-05-27 Gtk2::PageSetup(3pm)
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