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Show HN: Linux CLI tool to provide mutex locks for long running bash ops

14 bigattichouse 8 7/17/2025, 4:58:40 AM github.com ↗

Been exploring claude and spec-based coding, I think it turned out fairly successful. It's just a simple unix-style tool that gives you a single command to use in bash scripts to simplify mutex or semaphore locking of execution.

Comments (8)

sluongng · 34m ago

Why not https://man7.org/linux/man-pages/man2/flock.2.html?

Zacru · 5m ago

Because that's a syscall ;) https://man7.org/linux/man-pages/man1/flock.1.html is the command line manual.

I would say one good reason is that

  waitlock myapp &
  JOB_PID=$!
  # ... do exclusive work ...
  kill $JOB_PID

is a lot easier to use and remember than

  (; flock -n 9 || exit 1; # ... commands executed under lock ...; ) 9>/var/lock/mylockfile

yjftsjthsd-h · 1m ago

Why

  (; flock -n 9

and not

  ( flock -n 9

?

yjftsjthsd-h · 12m ago

Nit: Probably https://man7.org/linux/man-pages/man1/flock.1.html (shell command, not the underlying libc function)

anitil · 5m ago

This was my first thought and I suppose flock(1) could be used to recreate a lot of this. But it does come with some other quality-of-life improvements like being able to list all currently-used locks, having a lock holdable by N processes etc.

asddfgg55 · 42m ago

Useful project, I love all things terminal, so I also enjoyed your project.

forrestthewoods · 25m ago

I don’t know the exact threshold at which you should use a real programming language instead of a bash script. But this type of work definitely exceeds it.

anitil · 2m ago

While in general I'd agree, this isn't necessarily just for bash scripts. It could just wrap the execution of another program allowing higher-level logic to handle concurrency and the low-level program to do it's one-at-a-time job