03-08-2016
My 2 cents: Most probably your log file is not a true ascii file the format of a file can do such things which the cat command doesnt really care ( beware! ) I would not be surprised that using file command it returns you the content as "data" which does not necessarily mean ascii and so text (GUI ) editors cant read and I suppose tend to display just blanc, an example of such log files? the wtmp or utmp file
That said I worked late last night and its late now for me... so I might very well be writing a load of crap... Forgive me if its the case... and will be working very late tomorrow so Good night
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LEARN ABOUT OPENDARWIN
ac
AC(8) BSD System Manager's Manual AC(8)
NAME
ac -- display connect time accounting
SYNOPSIS
ac [-d] [-p] [-w file] [users ...]
DESCRIPTION
If the file /var/log/wtmp exists, a record of individual login and logout times are written to it by init(8) and login(8) respectively. The
program ac examines these records and writes the accumulated connect time for all logins to the standard output.
Options available:
-d Display the connect times in 24 hour chunks.
-p Display individual user totals.
-w file
Read raw connect time data from file instead of the default file /var/log/wtmp.
users ...
Display totals for the given individuals only.
If no arguments are given, ac displays the total amount of login time for all active accounts on the system.
The default wtmp file is an infinitely increasing file unless frequently truncated. This is normally done by the daily daemon scripts sched-
uled by cron(8) which rename and rotate the wtmp files before truncating them (and keeping about a weeks worth on hand). No login times are
collected however, if the file does not exist.
FILES
/var/log/wtmp
/var/log/wtmp.[0-7] rotated files
SEE ALSO
init(8), sa(8), login(1), utmp(5).
HISTORY
A ac command appeared in Version 6 AT&T UNIX.
4th Berkeley Distribution April 19, 1994 4th Berkeley Distribution