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A comment on Ask HN: What's the Oldest App You Still Use Daily.
Some may be older. Ones I actually port to new machines and use are the perl "ren" script and the rdb relational database (perl) by Hobbs.
Source:
https://github.com/ironsmith58/RDB/tree/master
Article:
https://seann.herdejurgen.com/samag.com/html/v11/i01/a6.htm
Docs as pdf:
https://casegroup.rutgers.edu/lnotes/ccb550/spring20/RDB.pdf
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Some may be older. Ones I actually port to new machines and use are the perl "ren" script and the rdb relational database (perl) by Hobbs.
Source:
https://github.com/ironsmith58/RDB/tree/master
Article:
https://seann.herdejurgen.com/samag.com/html/v11/i01/a6.htm
Docs as pdf:
https://casegroup.rutgers.edu/lnotes/ccb550/spring20/RDB.pdf