1969 - coding begins when they start to work in the PDP-7
1971 - first edition that runned in PDP-11/20 on innovadoras herramientas de procesamiento de texto.
1972 - Ritchie crea C y Thompson rewrites Unix in C, what made it portable
1973 - 3 introduces pipes and 4 edition
1975 - 6 edition installed at Berkeley by Thompson, first edition installed outside
bell labs Las Universidades empiezan a manifestar intereses por compartir el producto. Bell Labs distribuye Unix con
fuentes de manera abierta y libre a los entes del ambiente académico y científico solicitantes a cambio
de pagar los gastos de medio magnético, manual y flete; y deben reportar toda investigación y
 mejora que se desarrolle con el Sistema.
1978 - first commercial Unix from Interactive systems
1979 - seven edition, it had C and the Bourne shell
1982 - sustem III ia AT&Ts first commercail Unix and founding of Sun Microsystems launches Unix workstation industry
1980 - Microsoft creates Xenix

1983-  4.2BSD released, first Unix to have TCP/IP native
1984 - Unix becomescommercial product and source code restricted
1989 - unification xenix bsd system v
1991 - Linux
1992- The Linux kernel is combined with GNU to create the free GNU/Linux operating system, which many refer to as simply "Linux.
1999-U.S. President Clinton presents the National Medal of Technology to Ken Thompson and Dennis Ritchie for their work at Bell Labs.