File: vredir6.sub

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bash 5.3-2
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file content (14 lines) | stat: -rw-r--r-- 169 bytes parent folder | download | duplicates (9) 
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unset v
exec {v}</dev/null

if (( v >= 10 )); then echo ok 1; else echo bad 1; fi

exec {v}<&-

ulimit -n 6

exec </dev/null

unset v
exec {v}</dev/null
echo ${v-unset}