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var=$'\01\02\03\177'
bar=${unset:-$var}
recho "$bar"
unset -v bar
bar=${unset:-"$var"}
recho "$bar"
foo=${parameter:=$var}
recho "$foo"
recho "$parameter"
unset -v foo parameter
foo=${parameter:="$var"}
recho "$foo"
recho "$parameter"
unset -v foo parameter
foo="${parameter:=$var}"
recho "$foo"
recho "$parameter"
unset -v foo parameter
recho ${parameter:=a\ b}
unset -v parameter
recho ${parameter:="a b"}
unset -v parameter
v='a b'
recho ${parameter:=$v}
unset -v parameter
recho ${parameter:="$v"}
unset -v parameter
# unsetting IFS here
set " abc " " def ghi " "jkl "
unset -v IFS var
var=${var-$*}/${var-$*}
printf '[%s]\n' "$var"
unset -v var
: ${var=$*}
printf '[%s]\n' "$var"
unset -v var
: ${var:=$*/$*/${var-$*}}
printf '[%s]\n' "$var"
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