On 2/25/15 7:40 PM, Milo H. Fields wrote: > Greetings, > > I noticed that the ‘bang-hash’ behavior seems to have changed somewhere > between bash version 4.1.17 and 4.3.33. > > > > e.g. for the script ‘jnk’ containing: > > echo "plain: !#" > echo " parens: ${!#}"
It changed for Posix mode between bash-4.1 and bash-4.2, specifically in mid-October 2010. According to Posix, ${!#} and ${!?} are discrete word expansions (removing prefix pattern and displaying an error if unset, respectively) involving the $! parameter. Chet -- ``The lyf so short, the craft so long to lerne.'' - Chaucer ``Ars longa, vita brevis'' - Hippocrates Chet Ramey, ITS, CWRU c...@case.edu http://cnswww.cns.cwru.edu/~chet/