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  • \$\begingroup\$ The shell grammar does not require a ;; in the last alternative. Use ; to shave off a byte. \$\endgroup\$ Commented Aug 18, 2017 at 7:23
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    \$\begingroup\$ I've just tried this on bash-2.05a (compiled just now for Cygwin), and it incorrectly reports "3", not "2" :( \$\endgroup\$ Commented Aug 21, 2017 at 9:51
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    \$\begingroup\$ the interpret-$'\xN feature seems to have been added in 2.01.1... I will have to update my answer. Working on it \$\endgroup\$ Commented Aug 21, 2017 at 10:12
  • \$\begingroup\$ can I ask you to try this? s="$'\ua\xa\n'";case ${#s} in 3)echo 4;;5)echo 3;;7)echo 2;;9)echo 1;esac \$\endgroup\$ Commented Aug 21, 2017 at 10:16
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    \$\begingroup\$ You might be able to golf this to something like s=$'\ua\xa\n';expr 5 - ${#s} / 2. This works on v3 and v4. I don't have working older versions to try right now. \$\endgroup\$ Commented Jun 20, 2018 at 21:27