02-22-2013
Trim file using filename
I want to remove first xx letters from filename_xx . How is that possible using linux. I have many files where xx could be same in many but filename is always unique. Thanks!
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LEARN ABOUT OPENDARWIN
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)