photon-torpedo

Yes, and we can call the whole platform "Xitter".

Good question. Something to do with interactive mode?

  $ cat l.sh
  alias l=ls
  l
  $ sh l.sh
  file1  file2  l.sh
  $ bash l.sh
  l.sh: line 2: l: command not found
  $ bash -i l.sh
  file1  file2  l.sh

Edit: Ah yes, the man page says so.

> Aliases are not expanded when the shell is not interactive, unless the expand_aliases shell option is set using shopt

> is for them to have broken the encryption algorithms behind TLS/HTTPS.

Or if they have access to, or can subpoena, a MitMaaS for HTTPS. Like Cloudflare.

This is nice, but unfortunately

> Rosetta doesn’t support the bootstrapping or installation of Intel Linux distributions on Mac computers with Apple silicon using the Virtualization framework.

So I guess it still won't be possible to run RHEL (or derivative) VMs on Apple Silicon. (Their aarch64 images don't work, something obscure with page size IIRC. Odd because Debian/Ubuntu's aarch64 work fine.)

Edit: Looks like RHEL9 has changed page size so it can run as a VM on Apple Silicon. Unfortunately my common use case for VMs is to prototype things for production, and that's all on RHEL7/8. :(

> do they consider the memory is faulty when there are correctable errors?

It depends on the frequency. Occasional CEs are somewhat expected (on a large enough scale) and one can live with them, after all that's what ECC is for. When CEs start happening frequently on one machine, most likely a DIMM is going bad and will worsen over time, so one should replace it.

> The question was: which DIMM should we replace?

On server-class machines, ECC errors often also show up in the system event log, so one can run "ipmitool sel list" and inspect the most recent messages, and they often point to the failing DIMM in a nomenclature that corresponds to how the slots are labelled on the mainboard or in its manual.

In this case, they are using a "gaming" mainboard, so this strategy probably doesn't work (no nice system event log).

The author mentions that they also wrote a backup program (bup), and for backup programs it would be very convenient if directory mtimes would get updated like this (recursively up to the root), as it would allow to skip scanning the entire filesystem for changed files (which in my experience is where backup programs spend most of their time).

> pow(pow(pow(pow(pow(2, 2), 2), 2), 2), 2))

The Julia equivalent is:

    julia> ((((2^2)^2)^2)^2)^2
    4294967296

Julia's ^ is right-associative.