when

When is a command-line tool that watches a file or directory for modification and executes a command in response to that.

It currently runs on Linux over x86-64.

Usage

When requires a nop [1] binary to found in $PATH and that nop can find clib. This can be achieved by

% export NOPLIBS=/path/to/nop/libs

To execute a command in response to a change in a file, do

% when /path/to/file command

References

[1] https://github.com/iru-/nopforth