02-17-2012
Quote:
Originally Posted by
methyl
What Operating System and version you you have and what Shell do you use?
What are you trying to achieve? What final output are you looking for?
What are the names of the various wtmp files? Are they all in the same directory (including the active wtmp file itself)?
Have you been able to preserve the timestamp on each wtmp file?
There is rarely ever a need to expand a whole wtmp file into text.
Ps. I regularly run a script to find the last time a named user logged in. This script looks at a long history of wtmp files in reverse chronological order.
I'm using OpenSuse (school computer) and using BASH. What I'm trying to achieve is that I am eventually going to have to grep each of the files looking for a particular string. The string will only be matched in one of the files. The names of the wtmp files are wtmp-######### where #s are a timestamp and I need to preserve that time stamp once I turn the files into readable ones. Thus far, yes I have been able to preserve the timestamp. It comes down to being able to grep each of the wtmp files individually for a specific string to find the file so I know which file contains the record I'm looking for.
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LEARN ABOUT PLAN9
utmpdump
UTMPDUMP(1) User Commands UTMPDUMP(1)
NAME
utmpdump - dump UTMP and WTMP files in raw format
SYNOPSIS
utmpdump [options] [filename]
DESCRIPTION
utmpdump is a simple program to dump UTMP and WTMP files in raw format, so they can be examined. utmpdump reads from stdin unless a file-
name is passed.
OPTIONS
-f, --follow
Output appended data as the file grows.
-o, --output file
Write command output to file instead of standard output.
-r, --reverse
Undump, write back edited login information into the utmp or wtmp files.
-V, --version
Display version information and exit.
-h, --help
Display help text and exit.
NOTES
utmpdump can be useful in cases of corrupted utmp or wtmp entries. It can dump out utmp/wtmp to an ASCII file, which can then be edited to
remove bogus entries, and reintegrated using:
utmpdump -r < ascii_file > wtmp
But be warned, utmpdump was written for debugging purposes only.
File formats
The only binary version of the utmp(5) is standardised. Textual dumps may become incompatible in future.
The version 2.28 was the last one that printed text output using ctime(3) timestamp format. Newer dumps use millisecond precision ISO-8601
timestamp format in UTC-0 timezone. Conversion from former timestamp format can be made to binary, although attempt to do so can lead the
timestamps to drift amount of timezone offset.
BUGS
You may not use the -r option, as the format for the utmp/wtmp files strongly depends on the input format. This tool was not written for
normal use, but for debugging only.
AUTHOR
Michael Krapp
SEE ALSO
last(1), w(1), who(1), utmp(5)
AVAILABILITY
The utmpdump command is part of the util-linux package and is available from Linux Kernel Archive <https://www.kernel.org/pub/linux/utils
/util-linux/>.
util-linux July 2014 UTMPDUMP(1)