/usr/local/bin/healthcheck_port

pgrep: unrecognized option '--usage'

Usage:
 pgrep [options] <pattern>

Options:
 -d, --delimiter <string>  specify output delimiter
 -l, --list-name           list PID and process name
 -a, --list-full           list PID and full command line
     --quiet               suppress all normal output
 -v, --inverse             negates the matching
 -w, --lightweight         list all TID
 -c, --count               count of matching processes
 -f, --full                use full command line to match
 -g, --pgroup <PGID,...>   match listed process group IDs
 -G, --group <GID,...>     match real group IDs
 -i, --ignore-case         match case insensitively
 -n, --newest              select most recently started
 -o, --oldest              select least recently started
 -O, --older <seconds>     select where older than seconds
 -p, --pid <PID,...>       match process PIDs
 -P, --parent <PPID,...>   match only child processes of the given parent
 -s, --session <SID,...>   match session IDs
     --signal <sig>        signal to send (either number or name)
 -t, --terminal <tty,...>  match by controlling terminal
 -u, --euid <ID,...>       match by effective IDs
 -U, --uid <ID,...>        match by real IDs
 -x, --exact               match exactly with the command name
 -F, --pidfile <file>      read PIDs from file
 -L, --logpidfile          fail if PID file is not locked
 -r, --runstates <state>   match runstates [D,S,Z,...]
 -A, --ignore-ancestors    exclude our ancestors from results
 -Q, --shell-quote         output the command line in shell-quoted form
 --cgroup <grp,...>        match by cgroup v2 names
 --ns <PID>                match the processes that belong to the same
                           namespace as <pid>
 --nslist <ns,...>         list which namespaces will be considered for
                           the --ns option.
                           Available namespaces: ipc, mnt, net, pid, user, uts
  --env <name=val,...>     match on environment variable

 -h, --help     display this help and exit
 -V, --version  output version information and exit

For more details see pgrep(1).