On 07.05.19 10:12, David wrote: > On Mon, 6 May 2019 at 23:53, Erik Christiansen <dva...@internode.on.net> > wrote: > > On 06.05.19 09:03, Greg Wooledge wrote: > > > On Sat, May 04, 2019 at 01:48:01PM +0200, Jonas Smedegaard wrote: > > > > Quoting Erik Christiansen (2019-05-04 08:43:53) > > > > > > pmount $1 `e2label $1` > > > > and is using the ancient deprecated command substitution syntax (which > > > will work in this case, but is not a good habit). > > > That does appear to remain opinion. The venerably traditional syntax is > > still fully legal supported bash syntax, e.g.: > > > > http://pubs.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html#tag_02_06_03 > > > > The recent (late last century, IIRC) introduction of the $(...) > > alternative syntax has admittedly brought newer *nix users who know > > nothing else, and so delude themselves that there is nothing else. That > > is a misapprehension. To each, his own, especially amongst adequately > > equivalent alternatives. > > Hi Erik > > Maybe you would enjoy answering this question then? > https://lists.gnu.org/archive/html/help-bash/2019-05/msg00000.html > > Because apparently no-one else has, hehe :D
I can see why - the question wilfully exploits the fact that bash is not a full programming language, and only the author is dumb enough to construct such self defeating perversity as using two echos to fabricate difficulty where none need exist. (Please read next paragraph before kneejerking.) In a real case of substitution of more substantial commands, it is both simple and convenient to perform the operations sequentially (i.e. on separate lines), rather than obfuscate with unnecessary nesting. Having an intermediate result in a shell variable can often save a lot of debugging time, both during script development and later, when unanticipated input causes undesired effects. Having to deconstruct a long nested assemblage in order to debug it leads to a chained implementation in any event. Erik -- Good judgement comes from experience. Experience comes from bad judgement. - Jim Horning
