3 ms·

Is this a bash-ism? "$x plus $y equals $((x+y))"

by panzi 2y ago

jonahx 2y ago
This works in "sh" as well for me.
- panzi 2y ago
  On some systems (like on mine) sh is just a link to bash, so I couldn't test it.
  - Izkata 2y ago
    Isn't bash supposed to act like sh when executed with that name?
    - saagarjha 2y ago
      It still has bashisms
jwilk 2y ago
No, it's portable shell syntax.
LukeShu 2y ago
"$((" arithmetic expansion is POSIX (XCU 2.6.4 "Arithmetic Expansion"). But if I'm not mistaken, it originated in csh.
susam 2y ago
> Is this a bash-ism? > "$x plus $y equals $((x+y))" No, it is specified in POSIX: https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_06_04 https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V...