Just a nifty variant of strerror(3) for occasional usage.
Documentation by example:
strerror 11
=>
Resource temporarily unavailable
strerror ERANGE
=>
Numerical result out of range
verbose mode outputs a handy table
strerror --verbose 11
=>
11 EAGAIN Resource temporarily unavailable
strerror -v ERANGE
=>
34 ERANGE Numerical result out of range
multiple arguments are possible:
strerror -v 15 EBUSY
=>
15 ENOTBLK Block device required
16 EBUSY Device or resource busy
That's pretty much all strerror will ever be able to do.