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Top Forums UNIX for Beginners Questions & Answers sed awk: split a large file to unique file names Post 302980154 by MadeInGermany on Wednesday 24th of August 2016 01:42:55 PM
Old 08-24-2016
I like the shell solution. It can become a little more I/O efficient (matters when the output files are written to a network file system):
Code:
p_col1=""
while read col1 rest
do
  if [ "$col1" != "$p_col1" ]
  then
    p_col1=$col1
    exec 3>"$col1".txt
  fi
  echo "$col1 $rest" >&3
done < Input_file
exec 3>&-

The input file must be sorted on col1 (otherwise: remove previous output files and append with exec 3>>"$col1".txt)

Last edited by MadeInGermany; 08-24-2016 at 04:42 PM.. Reason: Removed comment about awk - close() releases the file descriptors!
This User Gave Thanks to MadeInGermany For This Post:
 

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

NAME
Gtk2::ListStore - wrapper for GtkListStore HIERARCHY
Glib::Object +----Gtk2::ListStore INTERFACES
Gtk2::TreeModel Gtk2::TreeDragSource Gtk2::TreeDragDest Gtk2::TreeSortable Gtk2::Buildable METHODS
liststore = Gtk2::ListStore->new (...) o ... (list) of strings treeiter = $list_store->append $list_store->clear $list_store->set_column_types (...) o ... (list) of strings $list_store->set ($iter, $col1, $val1, ...) o $iter (Gtk2::TreeIter) o $col1 (integer) the first column number o $val1 (scalar) the first value o ... (list) pairs of column numbers and values treeiter = $list_store->insert ($position) o $position (integer) treeiter = $list_store->insert_after ($sibling) o $sibling (Gtk2::TreeIter or undef) treeiter = $list_store->insert_before ($sibling) o $sibling (Gtk2::TreeIter or undef) treeiter = $list_store->insert_with_values ($position, ...) o $position (integer) position to insert the new row o ... (list) pairs of column numbers and values Like doing insert followed by set, except that insert_with_values emits only the row-inserted signal, rather than row-inserted, row- changed, and, if the store is sorted, rows-reordered as in the multiple-operation case. Since emitting the rows-reordered signal repeatedly can affect the performance of the program, insert_with_values should generally be preferred when inserting rows in a sorted list store. Since: gtk+ 2.6 boolean = $list_store->iter_is_valid ($iter) o $iter (Gtk2::TreeIter) Since: gtk+ 2.2 $store->move_after ($iter, $position) o $iter (Gtk2::TreeIter) o $position (Gtk2::TreeIter or undef) Since: gtk+ 2.2 $store->move_before ($iter, $position) o $iter (Gtk2::TreeIter) o $position (Gtk2::TreeIter or undef) Since: gtk+ 2.2 treeiter = $list_store->prepend boolean = $list_store->remove ($iter) o $iter (Gtk2::TreeIter) The return is always a boolean in the style of Gtk 2.2.x and up, even when running on Gtk 2.0.x. $store->reorder (...) o ... (list) of integers the reordered posistions Reorders store to follow the order indicated by new_order. Note that this function only works with unsorted stores. A list of position should be passed, one for each item in the list. Since: gtk+ 2.2 $store->swap ($a, $b) o $a (Gtk2::TreeIter) o $b (Gtk2::TreeIter) Since: gtk+ 2.2 $list_store->set_value ($iter, $col, $val) o $iter (Gtk2::TreeIter) o $val (scalar) o $col (integer) 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::ListStore(3pm)
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