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Top Forums Shell Programming and Scripting Understanding the output of fwtmp Post 302603676 by methyl on Thursday 1st of March 2012 06:26:42 PM
Old 03-01-2012
Sorry, I don't have access to the utmpx.h file on your system. I certainly agree with your interpretation of the essential fields (including the record type field).

Anybody got the same Solaris 10 release handy who can answer the question in full?

I cannot comment properly on your circumvention because the bug depends on whether the computer identity is available or not. Therefore it may not be consistent in every record.
I'd be tempted to detect whether $12 contains an invalid day and move an "invalid" field to the end of the record (which would then conform to the "normal" layour of a fwtmp login/logout record where the client IP address or name is the last field and has variable length).

Were it not for this awful bug I would normally split the multi-year wtmpx file into manageable chunks (years or even year-months) and use "fwtmp" in reverse to create individual archive wtmpx files with names which include the year and whereby each of which can be processed in "last".
Once you have done this once you automate the archive switchover to suit your local login/logout rate and stop the multi-year wtmpx situation ever occurring again.

Last edited by methyl; 03-01-2012 at 07:46 PM.. Reason: try to remove ambiguity
This User Gave Thanks to methyl For This Post:
 

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fwtmp(1M)																 fwtmp(1M)

NAME
fwtmp, wtmpfix - manipulate connect accounting records SYNOPSIS
[files] DESCRIPTION
fwtmp reads from the standard input and writes to the standard output, converting binary records of the type found in to formatted ASCII records. The ASCII version is useful to enable editing, via ed(1), bad records or for general purpose maintenance of the file. The argument is used to denote that input is in ASCII form, and output is to be written in binary form. The arguments and are independent, respectively specifying ASCII input and binary output. Therefor, is an ASCII to ASCII copy and is a binary to binary copy. should be used for reading If is not used, structure is read. wtmpfix examines the standard input or named files in format, corrects the time/date stamps to make the entries consistent, and writes to the stan- dard output. A can be used in place of files to indicate the standard input. If time/date corrections are not performed, will fault when it encounters certain date-change records. Each time the date is set, a pair of date change records is written to The first record is the old date denoted by the string old time placed in the line field and the flag placed in the type field of the structure. The second record specifies the new date, and is denoted by the string placed in the line field and the flag placed in the type field. uses these records to synchronize all time stamps in the file. nullifies date change records when writing to the standard output by setting the time field of the structure in the old date change record equal to the time field in the new date change record. This prevents and from factoring in a date change record pair more than once. In addition to correcting time/date stamps, wtmpfix checks the validity of the name field to ensure that it consists solely of alphanumeric characters or spaces. If it encounters a name that is considered invalid, it changes the login name to and writes a diagnostic to the standard error. This minimizes the risk that will fail when processing connect accounting records. DIAGNOSTICS
wtmpfix generates the following diagnostics messages: WARNINGS
generates no errors, even on garbage input. FILES
SEE ALSO
ed(1), acct(1M), acctcms(1M), acctcom(1M), acctcon(1M), acctmerg(1M), acctprc(1M), acctsh(1M), runacct(1M), acct(2), acct(4), utmp(4), wtmps(4). STANDARDS CONFORMANCE
fwtmp(1M)
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