[chasil]

Instead of saying:

  while true

You can instead say:

  while :

There is actually a /bin/true, which could involve the fork of a new process for each iteration of the loop. The form that I have shown you is guaranteed not to fork.

[z_zetetic_z]

Thank you sir!

[chasil]

You might find it interesting to know exactly what is (and is not) in the POSIX shell. The description of the colon : operator is there.

https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V...

Most of the familiar userland utilities are at that website, accessible as a (somewhat crude) Apache index:

https://pubs.opengroup.org/onlinepubs/9699919799/utilities/

Any POSIX-compliant system is required to implement the functionality described there.