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From: konsolebox <konsolebox@gmail.com>
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Subject: ${!prefix@} no longer expands in Bash 4.4-alpha
Date: Sun, 12 Jul 2015 00:17:34 +0800
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Xref: aioe.org gnu.bash.bug:11184

Bash 4.4-alpha no longer expands ${!prefix@}.
${!prefix*} however still works.

bash-4.4-alpha-4.4# var_1=a var_2=b
bash-4.4-alpha-4.4# set -- ${!var_@}
bash-4.4-alpha-4.4# echo $#
0
bash-4.4-alpha-4.4# set -- "${!var_@}"
bash-4.4-alpha-4.4# echo $#
1
bash-4.4-alpha-4.4# set -- ${!var_*}
bash-4.4-alpha-4.4# echo $#
2

konsolebox