Hi, zimoun skribis: > On Fri, 29 May 2020 at 11:26, Pierre Neidhardt wrote: > >> >> +@example >> >> +guix size $(guix system build config.scm) >> > >> > Please use backquotes instead of $(…), which is Bash-specific. >> >> Actually, it's not, $(...) is POSIX (you can test with Dash). >> Backquotes are deprecated and have the downside of not nesting. > > Yes, $(...) is POSIX, AFAIK. > And let quote what POSIX says: "Because of these inconsistent > behaviors, the backquoted variety of command substitution is not > recommended for new applications that nest command substitutions or > attempt to embed complex scripts." > > https://pubs.opengroup.org/onlinepubs/9699919799/xrat/V4_xcu_chap02.html#tag_23_02_06_03 I stand corrected! That’s news to me, but definitely good news. I’m all for using $(…) from now on. Thank you! Ludo’.