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Is there a standard, or at least well-accepted, CLI tool that calculates the public key out of a private key?
I've done my homework erading How do you get a Bitcoin Public Key from a Private Key, but it's from May 2014, and hopefully tooling has improved since then.
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To the best of my knowledge there is no standard CLI utility. However, there are some tools which seem to be generally accepted, like bitcoin-bash-tools
Alternatively, you can use some script library, such as pycoin (written in Python), or bitcoinjs.
Personally I like Bitcore libraries (Bitcore is not Bitcoin Core, despite their names are similar). They are also written in Javascript.
I wrote a simple library for handling keys/addresses that can be used from the command line with the NodeJS interpreter: https://github.com/frz-dev/btcutils/blob/master/bitcore-keys-utils.js. In your case you can use the getPubKey function, passing the private key object.
Hope this helps
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In fact, there are few CLI utilies that allow you this:
sx : command line Bitcoin to empower the sysadmin
cat key| sx pubkey
pybitcointools : SImple, common-sense Bitcoin-themed Python ECC library
pybtctool privtopub key
