Practical Programming in Tcl & Tk, Third Edition

Sorting Lists: lsort

You can sort a list in a variety of ways with lsort. The list is not sorted in place. Instead, a new list value is returned. The basic types of sorts are specified with the -ascii, -dictionary, -integer, or -real options. The -increasing or -decreasing option indicate the sorting order. The default option set is -ascii -increasing. An ASCII sort uses character codes, and a dictionary sort folds together case and treats digits like numbers. For example:

lsort -ascii {a Z n2 n100}
=> Z a n100 n2
lsort -dictionary {a Z n2 n100}
=> a n2 n100 Z
					

You can provide your own sorting function for special-purpose sorting. For example, suppose you have a list of names, where each element is itself a list containing the person's first ...