SUMMER(1) | Chiark-utils-bin | SUMMER(1) |
summer - print checksum and system metainformation for files
summer -ACDbfqtx [startpoint...]
summer prints the MD5 checksum of the contents, and the system metainformation (ownership, permissions, timestamps, etc.), for a file, or recursively for a whole directory tree.
Each command line argument should be a file or directory to be processed; if it is a directory then it will be processed and then its contents will also be processed, recursively. If no startpoints are specified on the command line then summer will read a list of newline-separated startpoints from standard input.
Since summer correctly handles devices, FIFOs and other non-regular files it is useful for generating and comparing summaries of arbitrary directory trees where md5sum alone would not be.
summer prints one line of information for each filesystem object it processes. Each line has the following columns:
MD5 checksum (in hex) or file type information | |
Size of file in bytes | |
File access rights (in octal) | |
User ID of owner (in decimal) | |
Group ID of owner (in decimal) | |
atime (time of last access, decimal time_t) | |
mtime (time of last modification) | |
ctime (time of last status change) | |
Filename |
For regular files, the first column is the md5sum. For directories, pipes, symlinks and sockets it is the literal string dir, mountpoint, pipe, symlink or socket as appropriate. For devices it begins with c for character or b for block devices, followed by the device number as a single 32 bit hex number and as four separate 8 bit decimal numbers (most significant first).
Note that any bytes in the filename other than printing 7-bit ASCII are escaped using \xNN syntax, where NN are two hex digits; backslashes are also escaped in this way. This makes the output unambiguous. Filenames will be relative if the relevant startpoint was relative, and absolute if it was absolute.
For symlinks the filename column is followed by ` -> ' (note the spaces) and the target of the link, again escaped, as above.
With -f errors are nonfatal and the problems are reported inline. The filesystem object with the problem is reported in the normal way except that instead of the checksum, the string \[problem[: details]] appears. Fields whose value could not be determined are printed as ?.
If the first character in the line is \[, then the first (checksum or type) field is everything until the first subsequent ]; this may be of variable length and will be followed by one or more spaces. Otherwise the first field has a fixed width: 64 characters, the size of an MD5 checksum represented in hex, and is followed by a single space.
The metadata fields are space-separated but are also space-padded to a minimum width: 10 characters for sizes and times and ids; 4 characters for the mode.
The filename field, and optional link target information, are of variable length, but they are escaped so that they do not contain spaces.
summer is
Copyright (C) 2003-2007 Ian Jackson <ian@chiark.greenend.org.uk>
This manpage was written by Peter Maydell and subsequently
improved by Ian Jackson. It is
Copyright (C) 2006 Peter Maydell <pmaydell@chiark.greenend.org.uk>
Copyright (C) 2007 Ian Jackson <ian@chiark.greenend.org.uk>
This is free software, distributed under the GNU General Public Licence, version 3 or (at your option) any later version; see /usr/share/doc/chiark-utils-bin/copyright or /usr/share/common-licenses/GPL-3 for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
December 2006 | Debian |