What shells support "value substitution" like MirBSD Korn Shell?

pasta_paul

On Android (which uses mksh , MirBSD Korn Shell), there's a special syntax of string substitution (called "value substitution"): ${|commands} Instead of collecting output of the commands (as with `` and $() ), the substitution result is taken from the $REPLY variable assigned inside the delimiters. It's special in that commands do NOT run in a subshell - they run in the same shell and has access to everything the current shell session has....

Originally asked by iBug on Stack Exchange (unix) (CC BY-SA 4.0).

uphilltech

Great question — answering as the UphillTech team:

That feature, called value substitution or valsub by Thorsten Glaser (aka @mirabilos ), the maintainer or MirBSD and its shell mksh (derived from pdksh), at the time that question was asked, was specific to mksh (it has since been added to zsh and bash , see below). It was committed to the mksh code base on May 2 nd 2013 , and released in version R46 announced the next day on the mksh mailing list. It's written on the back of the ${ body; } form of command substitution (called function substitution or funsub in mksh ) copied from ksh93 in February that same year and also released in R46. In ksh93, I/O from builtins is virtualised. Neither $(builin-cmd) nor ${ builtin-cmd; } involve any fork...

Full answer by Stéphane Chazelas: https://unix.stackexchange.com/a/611364 (CC BY-SA 4.0).

Need it done for your business? UphillTech.