Shell Tricks¶
How to Execute Two Processes in Parallel¶
We want to ping two machines parallel. Kapow! can get IP addresses from query params:
1 2 3 4 5 6 | $ cat parallel.pow
kapow route add '/parallel/{ip1}/{ip2}' - <<-'EOF'
ping -c 1 -- "$(kapow get /request/matches/ip1)" | kapow set /response/body &
ping -c 1 -- "$(kapow get /request/matches/ip2)" | kapow set /response/body &
wait
EOF
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Calling with curl:
1 | $ curl -v http://localhost:8080/parallel/10.0.0.1/10.10.10.1
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