Show the process using a TCP port
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read-onlyno known side effects Compatibility
LinuxVerified for Linux using posix, bash, zsh syntax.
Operational knowledgereview due 2027-01-20
Requirementsfuserfuser must be installed and available on PATH.
Version supportfuser Current supported releasesVerified for linux using posix, bash, zsh syntax; consult compatibility notes for platform-specific differences.
Expected signalsUSER PID ACCESS COMMANDRepresentative successful output; values vary with the selected target and system state.
Known errorsfuser: command not foundfuser is missing or is not available on PATH.
Verifyfuser -v {{port}}/tcpThe output matches the expected target and exits without an error.Rollback noteNot required: this command is read-only and does not change system state.
Command breakdown
01fuserCommandRuns the fuser stage of this one-liner.
02-vOptionEnables verbose output for this command.
03<port>/tcpParameterA value supplied in the Fill parameters section.
Example input
fuser -v 443/tcp
Example output
USER PID ACCESS COMMAND
443/tcp: root 842 F.... nginx
Illustrative output — exact values vary by system and data.
Official sources