41 lines
1.7 KiB
Markdown
41 lines
1.7 KiB
Markdown
# Process interaction snippets
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## Find process occupying port
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```bash
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ss -lptn 'sport = :5173'
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```
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### Output example:
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```bash
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State Recv-Q Send-Q Local Address:Port Peer Address:Port Process
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LISTEN 0 511 [::1]:5173 [::]:* users:(("node",pid=29634,fd=32))
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```
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## Kill process
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```bash
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sudo kill -[signal] [PID]
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```
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### Example:
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```bash
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sudo kill -9 29634
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```
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### Signals:
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- **SIGTERM (Signal 15).** This signal asks for a process to terminate. The process can capture this signal, perform cleanup operations, and then exit. By default, the kill command sends SIGTERM if no other signal is specified.
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- **SIGKILL (Signal 9).** It forcefully kills a process. The process cannot capture or ignore this signal, which results in an immediate termination. It should be used as a last resort when a process doesn’t respond to SIGTERM.
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- **SIGINT (Signal 2).** This is typically sent when you press Ctrl + C in the terminal. It interrupts a process and is usually used to stop a process running in the foreground.
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- **SIGHUP (Signal 1).** Sent to a process when its controlling terminal is closed and often used to reload configuration files.
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- **SIGQUIT (Signal 3).** Causes a process to terminate and produce a core dump file for debugging.
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- **SIGSTOP (Signal 19).** Pauses a process without killing it, similar to pressing Ctrl + Z in the terminal.
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- **SIGCONT (Signal 18).** Continues a process that was stopped by SIGSTOP or Ctrl + Z. |