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KiNgMaR/select-port.bash

Created April 21, 2021 10:29
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Bash script that atomically selects a port from the range 30000-40000 on Linux
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select-port.bash
# ref: https://unix.stackexchange.com/a/274499
#
RANDOM_PORT=$(expr `(flock -x 200; cat /tmp/nextport; expr \( \`cat /tmp/nextport 2>/dev/null\` + 1 \) % 10000 > /tmp/nextport;) 200>/tmp/nextport.lock` + 30000)
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