busybox pkill doesn't have '-u' option

[toshi0123]

error as follows.

# busybox pkill -u
pkill: unrecognized option: u
BusyBox v1.27.2 (2017-10-20 05:56:33 GMT) multi-call binary.

Usage: pkill [-l|-SIGNAL] [-fnovx] [-s SID|-P PPID|PATTERN]

Send a signal to process(es) selected by regex PATTERN

        -l      List all signals
        -f      Match against entire command line
        -n      Signal the newest process only
        -o      Signal the oldest process only
        -v      Negate the match
        -x      Match whole name (not substring)
        -s      Match session ID (0 for current)
        -P      Match parent process ID

[toshi0123]

busybox pkill is still used even if procps package is installed.
/usr/bin/pkill is linked to busybox. procps pkill is in /bin/.

# ls -l /usr/bin/pkill
lrwxrwxrwx    1 root     root            12 Nov 13 01:52 /usr/bin/pkill -> /bin/busybox
# ls -l /bin/pkill
lrwxrwxrwx    1 root     root             5 Nov 11 13:40 /bin/pkill -> pgrep

env PATH as follows prefer to use /usr/bin not /bin.

PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin

[toshi0123]

Modified as follows.

rm -f /usr/bin/pkill
ln -s /bin/pkill /usr/bin/pkill