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I've created a tag in the makefile:
mytag: $(shell ${PWD}/script.sh)

When i do: make clean - the script is executed

When i perform make or make mytag the script is again executed with the...

Which do you think is faster:

jim mcnamara version, or mine ?

unsigned long ms_uptime()
{
std::string script_loc, line;
script_loc = "/proc/uptime";
...

I need to get, in my application, in different methods, the uptime of the system in milliseconds.

time() - returns only seconds.
/proc/uptime - returns the seconds + a truncated milliseconds...