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Sergei Trofimovich

How to read just one byte from a file in `bash` without external programs?

`nixpkgs` attempted to use `read ... -n 1` and failed miserably:

$ f() { fd= b=; exec {fd}< /dev/urandom; read -r -n 1 -u "$fd" b; echo ${#b}; };f;f;f
2
1
2

It looks like `LANG=C` is enough to make char == byte:

$ f() { fd= b=; exec {fd}< /dev/urandom; LANG=C read -r -n 1 -u "$fd" b; echo ${#b}; };f;f;f
1
1
1

Discovered in github.com/NixOS/nixpkgs/pull/

Without the change isMachO fails to work on UTF-8 locales as read -u 4 decoders 4 UTF-8 chars and not 4 bytes. LANG=C forces it to read bytes. Closes: #431934 Things done Built on platform: x8...
GitHubstdenv/setup.sh: fix isMachO detection after bash-5.3 update by trofi · Pull Request #432097 · NixOS/nixpkgsAv trofi
#nixpkgs#bug
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earthling

Senesence
‘Two bodies nestled into stone strata echo the motif of becoming one with the land. The swirling patterns of rocks mirror the emotional and spiritual turbulence within; the human figures suggests vulnerability, protection and rebirth – an ancient theme found in both Persian poetry and archetypal narratives’

Photo by Azita Gandjei

@photography
#photography
#B&W

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