Last Change: 2018-09-07, 16:50
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savelog − save a log file
savelog [−m mode] [−u user] [−g group] [−t] [−p] [−c cycle] [−l] [−j] [−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:
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 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 performed:
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1) |
Version numbered files are cycled. Version cycle−2 is moved to version cycle−3, version cycle−1 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. |
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2) |
The new file.1 is compressed unless the −l flag was given. It is changed subject to the −m, −u, and −g flags. |
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3) |
The main file is moved to file.0. |
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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. |
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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.
−m mode
chmod the log files to mode, implies −t
−u user
chown log files to user, implies −t
−g group
chgrp log files to group, implies −t
−c cycle
Save cycle versions of the logfile (default: 7)
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−t |
touch new logfile into existence |
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−l |
don’t compress any log files (default: do compress) |
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−p |
preserve owner, group, and permissions of logfile |
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−j |
compress with bzip2 instead of gzip |
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−C |
force cleanup of cycled logfiles |
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−d |
use standard date for rolling |
−D dateformat
override date format, in the form of [MMDDhhmm[[CC]YY][.ss]]
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−r |
use rolldir instead of . to roll files |
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−n |
do not rotate empty files |
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−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.