tail -f helyett tail -F

update2, tail -F:

tail: ”/var/log/syslog” elérhetetlenné vált: Engedély megtagadva
tail: ”/var/log/syslog” elérhetővé vált
May 20 21:03:34  rsyslogd: [origin software="rsyslogd" swVersion="7.4.4" x-pid="925" x-info="http://www.rsyslog.com"] rsyslogd was HUPed

bővebben:

read(3, "", 8192)                       = 0
read(4, "\1\0\0\0\0\1\0\0\0\0\0\0\20\0\0\0syslog.1.gz\0\0\0\0\0", 32) = 32
read(4, "\1\0\0\0\4\0\0\0\0\0\0\0\20\0\0\0syslog.1.gz\0\0\0\0\0", 32) = 32
read(4, "\1\0\0\0\4\0\0\0\0\0\0\0\20\0\0\0syslog.1.gz\0\0\0\0\0", 32) = 32
read(4, "\1\0\0\0\200\0\0\0J\4\0\0\20\0\0\0syslog.6.gz\0\0\0\0\0", 32) = 32
read(4, "\1\0\0\0\200\0\0\0K\4\0\0\20\0\0\0syslog.5.gz\0\0\0\0\0", 32) = 32
read(4, "\1\0\0\0\200\0\0\0L\4\0\0\20\0\0\0syslog.4.gz\0\0\0\0\0", 32) = 32
read(4, "\1\0\0\0\200\0\0\0M\4\0\0\20\0\0\0syslog.3.gz\0\0\0\0\0", 32) = 32
read(4, "\1\0\0\0\200\0\0\0N\4\0\0\20\0\0\0syslog.2.gz\0\0\0\0\0", 32) = 32
read(4, "\1\0\0\0\200\0\0\0O\4\0\0\20\0\0\0syslog.1\0\0\0\0\0\0\0\0", 32) = 32
read(4, "\2\0\0\0\0\10\0\0\0\0\0\0\0\0\0\0", 32) = 16
open("/var/log/syslog", O_RDONLY|O_NONBLOCK) = 5
fstat(5, {st_mode=S_IFREG|0640, st_size=0, ...}) = 0
fstatfs(5, {f_type="EXT2_SUPER_MAGIC", f_bsize=4096, f_blocks=107548654, f_bfree=56896174, f_bavail=55799113, f_files=27328512, f_ffree=27101077, f_fsid={697267788, 15462011}, f_namelen=255, f_frsize=4096}) = 0
close(3)                                = 0
open("/usr/share/locale/locale.alias", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=2570, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7ffc3b820000
read(3, "# Locale name alias data base.\n#"..., 4096) = 2570
read(3, "", 4096)                       = 0
close(3)                                = 0
munmap(0x7ffc3b820000, 4096)            = 0
open("/usr/share/locale/hu/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale-langpack/hu/LC_MESSAGES/coreutils.mo", O_RDONLY) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=363738, ...}) = 0
mmap(NULL, 363738, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7ffc3b7aa000
close(3)                                = 0
open("/usr/lib/x86_64-linux-gnu/gconv/gconv-modules.cache", O_RDONLY) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=26258, ...}) = 0
mmap(NULL, 26258, PROT_READ, MAP_SHARED, 3, 0) = 0x7ffc3b81a000
close(3)                                = 0
write(2, "tail: ", 6tail: )                   = 6
write(2, "\342\200\235/var/log/syslog\342\200\235 helyettes\303"..., 87”/var/log/syslog” helyettesítésre került; a program az új fájl végét követi) = 87
write(2, "\n", 1
)                       = 1
lseek(5, 0, SEEK_SET)                   = 0
read(4, "\1\0\0\0\0\1\0\0\0\0\0\0\20\0\0\0syslog\0\0\0\0\0\0\0\0\0\0", 32) = 32
inotify_add_watch(4, "/var/log/syslog", IN_MODIFY|IN_ATTRIB|IN_DELETE_SELF|IN_MOVE_SELF) = 3
open("/var/log/syslog", O_RDONLY|O_NONBLOCK) = 3

azonban ez engem nem elégít ki, nem akarok -F-et használni ;) inkább átállítom a syslogot, hogy ne dátum, hanem méret alapján rotáljon.