Perl 4

Perl 4 was introduced in March 1991. First 16-bit version for OS/2 was available in June 1991.

Version
Microsoft C ports: EMX-based ports:
 * 4.0 pl10 (Jun 1991)
 * 4.0 pl19 (Nov 1991)
 * 4.0 pl35 (Oct 1992)
 * 4.0 pl36 (Feb 1993) - perl4036.zip
 * 4.0.1.8 (Oct 1993) - OS/2 port of Kevin Stock's oraperl v1 patch 3 oraperl2.zip by Forrest Whitcher

Licence

 * Perl is open source software distributed under either the Artistic License or the GNU General Public License.
 * Original author: Larry Wall
 * OS/2 port: Kai-Uwe Rommel

Publications

 * Larry Wall; Randal Schwartz: Programming Perl - O'Reilly 1991, ISBN 0-937175-64-1 (examples)