savelog - save a log file
savelog [-m mode] [-u user] [-g group] [-t] [-p] [-c cycle] [-l] [-j] [-J] [-1 .. -9] [-C]
[-d] [-l] [-r rolldir] [-n] [-q] [-D dateformat] file ...
The savelog command saves and optionally compresses old copies of files. Older versions
of file are named:
where <number> is the version number, 0 being the newest. Version numbers > 0 are com-
pressed unless -l prevents it. Version number 0 is not compressed because 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 per-
1) Version numbered files are cycled. Version file.2 is moved to version file.3, ver-
sion file.1 is moved to version file.2, and so on. Finally version file.0 is moved
to version file.1, and version file is deleted. Both compressed names and uncom-
pressed 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 sub-
ject 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.
chmod the log files to mode, implies -t
chown log files to user, implies -t
chgrp log files to group, implies -t
Save cycle versions of the logfile (default: 7). The cycle count must be at least
-t touch new logfile into existence
-l don't compress any log files (default: do compress)
-p preserve owner, group, and permissions of logfile
-j compress with bzip2 instead of gzip
-J compress with xz instead of gzip
For xz no strength option is set, and xz decides on the default based on the total
amount of physical RAM. Note that xz can use a very large amount of memory for the
higher compression levels.
-1 .. -9
compression strength or memory usage (default: 9, except for xz)
-C force cleanup of cycled logfiles
-d use standard date for rolling
override date format, in the form of [MMDDhhmm[[CC]YY][.ss]]
-r use rolldir instead of . to roll files
-n do not rotate empty files
-q be quiet
If a process is still writing to file.0, and savelog moves it to file.1 and compresses it,
data could be lost.
Debian 30 Jun 2010 SAVELOG(8)