rotating pattern: /var/log/syslog  forced from command line (12 rotations)
empty log files are not rotated, log files >= 52428800 are rotated earlier, old logs are removed
switching euid to 0 and egid to 108
considering log /var/log/syslog
  log needs rotating
rotating log /var/log/syslog, log->rotateCount is 12
dateext suffix '-20170719'
glob pattern '-[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]'
previous log /var/log/syslog.1 does not exist
renaming /var/log/syslog.12.gz to /var/log/syslog.13.gz (rotatecount 12, logstart 1, i 12),
renaming /var/log/syslog.11.gz to /var/log/syslog.12.gz (rotatecount 12, logstart 1, i 11),
renaming /var/log/syslog.10.gz to /var/log/syslog.11.gz (rotatecount 12, logstart 1, i 10),
renaming /var/log/syslog.9.gz to /var/log/syslog.10.gz (rotatecount 12, logstart 1, i 9),
renaming /var/log/syslog.8.gz to /var/log/syslog.9.gz (rotatecount 12, logstart 1, i 8),
renaming /var/log/syslog.7.gz to /var/log/syslog.8.gz (rotatecount 12, logstart 1, i 7),
renaming /var/log/syslog.6.gz to /var/log/syslog.7.gz (rotatecount 12, logstart 1, i 6),
renaming /var/log/syslog.5.gz to /var/log/syslog.6.gz (rotatecount 12, logstart 1, i 5),
renaming /var/log/syslog.4.gz to /var/log/syslog.5.gz (rotatecount 12, logstart 1, i 4),
renaming /var/log/syslog.3.gz to /var/log/syslog.4.gz (rotatecount 12, logstart 1, i 3),
renaming /var/log/syslog.2.gz to /var/log/syslog.3.gz (rotatecount 12, logstart 1, i 2),
renaming /var/log/syslog.1.gz to /var/log/syslog.2.gz (rotatecount 12, logstart 1, i 1),
renaming /var/log/syslog.0.gz to /var/log/syslog.1.gz (rotatecount 12, logstart 1, i 0),
copying /var/log/syslog to /var/log/syslog.1
truncating /var/log/syslog
removing old log /var/log/syslog.13.gz
error: error opening /var/log/syslog.13.gz: No such file or directory
switching euid to 0 and egid to 0