YELT is not SED -- but it is an extended variant

If you are SED user and you love it but wish it could do a few more things, or, more likely, if you would like to use SED but you find writing effective programs a bit overwhelming, you might want to give yelt a try.

Yelt is stream text editor that is intended to be used as part of command line scripts. Yelt's command language is very similar to SED's (with a few incompatibilities) but with a few extensions:

10 string register variables for general use
defining and calling text processing functions
an if-then-else statement
increment and decrement of integer strings
Processing lines, using the yelt script language, from a file whose name is computed or read from stdin. That is, you are not restrained to processing lines passed in on the command line.
Writing to files other than stdout -- again, whose names are computed.
escape sequence support in most places (\n, \e, etc)
cut statement (lets you process columns of text)
string substitution using a string-to-string map file whose name is specified on the command line.
builtin tab expansion
easy extensibility for adding your own text processing shortcuts.
parsing primitives.

Yelt does not have goto labels, but it does have a while loop. Scripts do work differently in yelt than in SEd, but the transition from sed to yelt is very minor. See the following files:

Copyright Info
Yelt Training
HOWTO's
yelt's -h output

Obtaining the source and compiling

Get Yelt

Compiling on linux should be as simple as extracting the .zip file into a directory and running GNU make.

To compile Windows, if you are using cygwin, should work exactly the same way. If you are not using cygwin or do not have a GNU make that works for you, just try compiling the yelt source files like this: