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User Commands ckwtmpx(1) NAME ckwtmpx - check Solaris wtmpx files for corruption, and per- form optional repairs. SYNOPSIS ckwtmpx [-d] [-o output_file] [-e error_file] [-t time_travel] ckwtmpx -h ckwtmpx -v DESCRIPTION It sometimes happens, either malevolently or otherwise, that Solaris' binary format accounting file /var/adm/wtmpx becomes corrupted. The only normal symptom of this is that standard tools such as last stop processing the file as soon as the corrupt data is encountered (last produces neither an error message nor a non-zero return code). ckwtmpx attempts to read a wtmpx file from standard input one record at a time. Valid records are copied to the (optional) output file (-o), and bytes that are discarded are copied to the (optional) error file (-e). When an invalid record is encountered, ckwtmpx moves forward through the standard input one character at a time until the start of a valid record is found. Skipped bytes are written to the error file as they are discarded. Errors and debug information are sent to stderr. A valid record fulfills the following criteria: Epoch time (ut_tv) is greater than 0 (was written after 1 Jan 1970). Epoch time (ut_tv) is before now (was not written in the future). The wtmpx record type (ut_type) is valid. Either this is the first valid record found or it is not more than 70 seconds younger than the previous record found. (Some systems may buffer output to wtmpx result- ing occasional temporal misordering of records, see the -t flag below). See <utmpx.h> and <utmp.h> for more details on the binary record format, in particular struct futmpx in <utmpx.h> for details of the record serialization. SunOS 5.10 Last change: 19 Jun 2010 1 User Commands ckwtmpx(1) OPTIONS Flags -d, -e and -o may be combined as required but note that ckwtmpx -o /var/adm/wtmpx </var/adm/wtmpx will almost certainly cause pain. Use a temporary file. The following options are supported: -d Enable debug output to stderr. -h Print usage to stdout and exit. -e error_file Writes skipped bytes from the corrected wtmpx file to error_file. -o output_file Writes the corrected wtmpx file to output_file. -t time_travel Specifies the number of seconds by which a record may be younger than its predecessor and still be con- sidered valid. One might expect that records would be written in strict chronological order but this is not the case. The default is 70 seconds which seems appropriate for most cases. -v Print version to stdout and exit. RETURN VALUE Returns 0 if the wtmpx file is okay, 1 if it is corrupt and 2 on fatal errors (syntax, file permissions, ...) so ckwtmpx can be run with no arguments for testing file validity without spurious output: if ! ckwtmpx </var/adm/wtmpx ; then ... EXAMPLES ckwtmpx -e /tmp/err -o /tmp/out </var/adm/wtmpx SunOS 5.10 Last change: 19 Jun 2010 2 User Commands ckwtmpx(1) Writes corrected binary file to /tmp/out and skipped bytes to /tmp/err. ckwtmpx -d </var/adm/wtmpx Writes debug information (details of each record and skip/seek attempts) to stderr. AUTHOR Martin Carpenter, firstname.lastname@example.org, Copyright 2010. FILES /var/adm/wtmpx accounting file SEE ALSO last(1), utmpx(4) SunOS 5.10 Last change: 19 Jun 2010 3