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lang-bash
t=${t%?}is not Bourne but you're not likely to come across a Bourne shell nowadays.${t%?}does work in all the other ones though.fishis work in progress. 2.3.0 which introduced thestringbuiltin was not released at the time of the Q&A. With the version I'm testing it on, you needstring replace -r '(?s).\z' '' -- $t(and I'd expect they'd want to change that, they should change the flags they pass to PCRE) or more convoluted ones. It also deals poorly with newline characters, and I know they're planning on changing that as well.t=${t:0:-1}(extending the${var:offset:length}ksh93 operator). For each, I gave which shells support it. You can use the Bourne/POSIX ones from and modernsh.