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Clear a port held by more than one process #789

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Clear a port held by more than one process #789

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9 changes: 4 additions & 5 deletions bin/clear-port
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Original file line number Diff line number Diff line change
@@ -1,14 +1,13 @@
#!/bin/sh

# Kills the process running on the provided port
# Kills the processes listening on the provided port
#
# clear-port 3000

if [ -n "$1" ]; then
port_num="$(lsof -ti4TCP:"$1")"
if [ $? -eq 0 ]; then
kill "$port_num"
fi
# A port can be held by more than one process, and a forked server's workers
# die with the parent, so signal every PID in a single kill.
lsof -ti4TCP:"$1" -sTCP:LISTEN | xargs -r kill
else
echo >&2 Usage: clear-port port-number
exit 1
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