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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 signals/var/log/syslog: 611Representative 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 {{file}}The 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<file>ParameterA value supplied in the Fill parameters section.
Example input
fuser /var/log/syslog
Example output
/var/log/syslog: 611
Illustrative output — exact values vary by system and data.
Official sources