The
savelog command saves and optionally compresses old copies of files. Older versions
of
file are named:
"file" "." "<number>" "" "<compress_suffix>"
where
<number> is the version number, 0 being the newest. Version numbers > 0 are compressed
unless
-l prevents it. Version number 0 is not compressed becase a process might still
have
file opened for I/O. Only
cycle versions of the file are kept.
If the file does not exist and
-t was given, it will be created.
For files that do exist and have lengths greater than zero, the following
actions are performed:
1)
Version numbered files are cycled. Version
cycle -2 is moved to version
cycle "-1," version
cycle -3 is moved to version
cycle "-2 ," and so on. Finally version 0 is moved to version 1, and version
cycle is deleted. Both
compressed names and uncompressed names are cycled, regardless of
-l . Missing version files are ignored.
2)
The new
file.1 is compressed unless the
-l flag was given. It is changed subject to the
"-m" ", " "-u" ", and " "-g" flags.
3)
The main file is moved to
file.0 .
4)
If the
"-m" ", " "-u" ", " "-g" ", " "-t" ", or " "-p" flags are given, then an empty
file is created subject to the given flags. With the
-p flag, the file is created with the same owner, group, and permissions as
before.
5)
The new
file.0 is changed subject to the
"-m" ", " "-u" ", and " "-g" flags.
Since the version numbers start with 0, version number
cycle is never formed. The
cycle count must be at least 2.
OPTIONS
-m mode
chmod the log files to mode
-u user
chown log files to user
-g group
chgrp log files to group
-c cycle
Save cycle versions of the logfile (default: 7)
-t
touch new logfile into existence
-l
don't compress any log files (default: do compress)
-p
preserve owner, group, and permissions of logfile
BUGS
If a process is still writing to
"file.0" "," and savelog moves it to
file.1 and compresses it, data could be lost.