How do I sort files in TCL?

Open the file in read mode, read all text in a string, split this string by \n , loop over each line, split the line by space, store the first column as key and second column as value in a tcl array. Then see

How do I sort an array in TCL?

Tcl’s lsort command lets you sort a list – and that can be a list of the keys of an array. You can’t sort the array, but once you have the list of keys you can sort that and use it to iterate through the array in any order that you like.

How do I create a list in TCL?

Tcl – Lists

1. Creating a List. The general syntax for list is given below − set listName { item1 item2 item3 ..
2. Appending Item to a List.
3. Length of List.
4. List Item at Index.
5. Insert Item at Index.
6. Replace Items at Indices.
7. Set Item at Index.
8. Transform List to Variables.

How do I use Lappend in TCL?

Lappend is similar to append except that the values are appended as list elements rather than raw text. This command provides a relatively efficient way to build up large lists. For example, “lappend a $b” is much more efficient than “set a [concat $a [list $b]]” when $a is long.

What is Dict in TCL?

Advertisements. A dictionary is an arrangement for mapping values to keys. The syntax for the conventional dictionary is shown below − dict set dictname key value # or dict create dictname key1 value1 key2 value2 ..

What is a list in Tcl?

A list is an ordered collection of elements, of no fixed length. The list elements can be any string values, including numbers, variable names, file names, bits of Tcl code and other lists. The latter is possible because lists are just strings with a special interpretation that gives them structure.

How do I add a list in Tcl?

What is lindex command?

The lindex command returns a particular element of a list. It takes an index; list indices count from zero.

How do you write a loop in TCL?

Tcl – For Loops

1. The initialization step is executed first, and only once.
2. Next, the condition is evaluated.
3. After the body of the for loop executes, the flow of control jumps back up to the increment statement.
4. The condition is now evaluated again.

How to sort a list of lists in Tcl?

As everything (except an array) is a string in Tcl, when you sort a list the language defaults to an asciibetic sort – which you can vary with the -integer or -real options to lsort.

How do I sort a list using L sort?

Given that list, sort it using the lsort command passing it the -index 1 option which makes lsort interpret the elements of the list it sorts as lists, and use their elements at index 1 (the 2nd position) for sorting. To print out the elements of the sorted list, you need to extract the key and the value back from each of them.

What version of Tcl does the -stride option require?

The -stride option requires Tcl 8.6. In older versions of Tcl, you have to pack things up into a list of tuples:

Is it safe to use the L sort command?

The lsort command is reentrant, meaning it is safe to use as part of the implementation of a command used in the -command option. Sorting a list using Dictionary sorting: