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Full Discussion: Match text to lines in a file, iterate backwards until text or text substring matches, print to file
Top Forums Shell Programming and Scripting Match text to lines in a file, iterate backwards until text or text substring matches, print to file Post 303038582 by MadeInGermany on Friday 6th of September 2019 01:36:12 PM
Old 09-06-2019
A shell script that works as I described:
Code:
#!/bin/sh
# read from f1, print in this order
while read f1line
do
  # read from f2, find matches => print
  while IFS="," read f2col1 f2othercols
  do
    case $f1line in
    ("$f2col1"*)
      echo "$f1line,$f2col1,$f2othercols"
    esac
  done < file2.txt
done < file1.txt

The same idea in awk (file2 is read into an array variable first):
Code:
#!/bin/sh
awk -F"," '
{
  if (NR==FNR) {
  # read from f2 into associative array col1[]
    col1[$1]=($2 FS $3)
  } else {
  # read from f1, find matches => print
    for (c in col1)
      if (c == substr($0,1,length(c)))
        print $0 FS c FS col1[c]
  }  
}
' file2.txt file1.txt

In awk your propsed way can be implemented with no big overhead:
Code:
#!/bin/sh
awk -F"," '
{
  if (NR==FNR) {
  # read from f2 into associative array col1[]
    col1[$1]=($2 FS $3)
  } else {
  # read from f1, find matches => print
  for (i=length; i>=1; i--)
    if ((c=substr($0,1,i)) in col1)
      print $0 FS c FS col1[c]
  }  
}
' file2.txt file1.txt

 

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LEARN ABOUT DEBIAN

gtk2::treestore

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

NAME

       Gtk2::TreeStore - wrapper for GtkTreeStore

HIERARCHY

	 Glib::Object
	 +----Gtk2::TreeStore

INTERFACES

	 Gtk2::TreeModel
	 Gtk2::TreeDragSource
	 Gtk2::TreeDragDest
	 Gtk2::TreeSortable
	 Gtk2::Buildable

METHODS

   treestore = Gtk2::TreeStore->new (...)
       o   ... (list) of strings, package names

   treeiter = $tree_store->append ($parent)
       o   $parent (Gtk2::TreeIter or undef)

   $tree_store->clear
   $tree_store->set_column_types (...)
       o   ... (list) of strings, package names

   $tree_store->set ($iter, $col1, $val1, ...)
       o   $iter (Gtk2::TreeIter)

       o   $col1 (integer) the first column number

       o   $val1 (scalar) the first value

       o   ... (list) pairs of columns and values

   treeiter = $tree_store->insert ($parent, $position)
       o   $parent (Gtk2::TreeIter or undef)

       o   $position (integer)

   treeiter = $tree_store->insert_after ($parent, $sibling)
       o   $parent (Gtk2::TreeIter or undef)

       o   $sibling (Gtk2::TreeIter or undef)

   treeiter = $tree_store->insert_before ($parent, $sibling)
       o   $parent (Gtk2::TreeIter or undef)

       o   $sibling (Gtk2::TreeIter or undef)

   treeiter = $tree_store->insert_with_values ($parent, $position, ...)
       o   $parent (Gtk2::TreeIter or undef)

       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 tree
       store.

       Since: gtk+ 2.10

   boolean = $tree_store->is_ancestor ($iter, $descendant)
       o   $iter (Gtk2::TreeIter)

       o   $descendant (Gtk2::TreeIter)

   integer = $tree_store->iter_depth ($iter)
       o   $iter (Gtk2::TreeIter)

   boolean = $tree_store->iter_is_valid ($iter)
       o   $iter (Gtk2::TreeIter)

       Since: gtk+ 2.2

   $tree_store->move_after ($iter, $position)
       o   $iter (Gtk2::TreeIter)

       o   $position (Gtk2::TreeIter or undef)

       Since: gtk+ 2.2

   $tree_store->move_before ($iter, $position)
       o   $iter (Gtk2::TreeIter)

       o   $position (Gtk2::TreeIter or undef)

       Since: gtk+ 2.2

   treeiter = $tree_store->prepend ($parent)
       o   $parent (Gtk2::TreeIter or undef)

   boolean = $tree_store->remove ($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.

   $tree_store->reorder ($parent, ...)
       o   $parent (Gtk2::TreeIter or undef)

       o   ... (list) of integer's, the new_order

       Since: gtk+ 2.2

   $tree_store->swap ($a, $b)
       o   $a (Gtk2::TreeIter)

       o   $b (Gtk2::TreeIter)

       Since: gtk+ 2.2

   $tree_store->set_value ($iter, $col1, $val1, ...)
       o   $iter (Gtk2::TreeIter)

       o   $col1 (integer) the first column number

       o   $val1 (scalar) the first value

       o   ... (list) pairs of columns and values

       Alias for Gtk2::TreeStore::set().

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::TreeStore(3pm)
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