On Tue, Jan 17, 2017 at 01:56:29PM +0100, Hartmut Goebel wrote: > Am 17.01.2017 um 12:34 schrieb Danny Milosavljevic: > > For minimal improvement (I don't even think it's measureable), try > > `git rev-list HEAD` (backquotes) - it prevents having to spawn a > > subshell. > > Huh? I doubt this. The bash manual, section "Command Substitution" does > not distinguish between these both, as far as I understand it.
The POSIX shell command language specification says that: "The shell shall expand the command substitution by executing command in a subshell environment (see Shell Execution Environment) and replacing the command substitution (the text of command plus the enclosing "$()" or backquotes) with the standard output of the command, removing sequences of one or more <newline>s at the end of the substitution." http://pubs.opengroup.org/onlinepubs/007904875/utilities/xcu_chap02.html#tag_02_06_03 Maybe it's faster, maybe not, but I think my benchmark was misinterpreted...
