Been using UNIX since the late 80s; Linux since the mid-90s; virtualization since the early 2000s and spent the past few years working in the cloud space.
Location
Alexandria, VA, USA
Education
B.S. Psychology from Pennsylvania State University
Depends on what you mean by "know". If measuring against, "knowing all possible ways of doing things in a given language," then "none."
Mostly, I have an overall knowledge of the things I ought to be able to accomplish in any given language, and then one "home" language where I can do those things with minimal dicking with Google to refresh myself. I've a couple other languages that I need to have close-to-the-top of my brain, but what those are and their "freshness" relative to each other varies depending on workload (i.e., "how recently I've had to use them"). That list changes over time – sometimes with addition of a new language or a language falling into the "mental archives" – an is heavily driven by work-demands.
On the plus side of code-linters, it tends to mean that the amount of <LANGUAGE_A>y-ness of my <LANGUAGE_B> output is reduced over what it used to be.
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Depends on what you mean by "know". If measuring against, "knowing all possible ways of doing things in a given language," then "none."
Mostly, I have an overall knowledge of the things I ought to be able to accomplish in any given language, and then one "home" language where I can do those things with minimal dicking with Google to refresh myself. I've a couple other languages that I need to have close-to-the-top of my brain, but what those are and their "freshness" relative to each other varies depending on workload (i.e., "how recently I've had to use them"). That list changes over time – sometimes with addition of a new language or a language falling into the "mental archives" – an is heavily driven by work-demands.
On the plus side of code-linters, it tends to mean that the amount of <LANGUAGE_A>y-ness of my <LANGUAGE_B> output is reduced over what it used to be.