Re: efficient way to use matched string in variable substitution

[Léa Gris]

Le 24/08/2021 à 14:06, Greg Wooledge écrivait :

> unicorn:~$ f6() { local i n=${#1} arr; for ((i=0; i<n; i++)); do 
> arr[i]="${1:i:1}"; done; }
> unicorn:~$ time for ((i=1; i<=10000; i++)); do f6 682390; done
> real 0.381  user 0.381  sys 0.000
>
> Looks like the efficiency of "read -ra" vs. a shell loop just about makes
> up for the system calls used for the here string (f6 and f7 are almost
> tied in overall speed, with f6 just a *tiny* bit faster).  Good to know.

See my featured version to also capture space and newlines:

https://stackoverflow.com/a/68907322/7939871


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