10-11-2012
You might want to reduce the values to either:
- RDBMS-like lines/rows for easy comparison with sort and comm, and then write a tool to turn them into configuration files or scripts to reinstall the configuration. If you want to change some parameters, modify the file and then feed the lines to the tool. Each line/row might have one value after its description. The storge of a value that appears many places in one cell means generated files are mutually consistent.
- Write a shadow subtree of host-dirs/files: configuration files or scripts to reinstall the configuration. You can then diff -r saved subtrees with new subtrees.
This way, you can easily detect a changed configuration, and restore it.
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LEARN ABOUT OPENDARWIN
comm
COMM(1) BSD General Commands Manual COMM(1)
NAME
comm -- select or reject lines common to two files
SYNOPSIS
comm [-123i] file1 file2
DESCRIPTION
The comm utility reads file1 and file2, which should be sorted lexically, and produces three text columns as output: lines only in file1;
lines only in file2; and lines in both files.
The filename ``-'' means the standard input.
The following options are available:
-1 Suppress printing of column 1.
-2 Suppress printing of column 2.
-3 Suppress printing of column 3.
-i Case insensitive comparison of lines.
Each column will have a number of tab characters prepended to it equal to the number of lower numbered columns that are being printed. For
example, if column number two is being suppressed, lines printed in column number one will not have any tabs preceding them, and lines
printed in column number three will have one.
The comm utility assumes that the files are lexically sorted; all characters participate in line comparisons.
DIAGNOSTICS
The comm utility exits 0 on success, and >0 if an error occurs.
SEE ALSO
cmp(1), diff(1), sort(1), uniq(1)
STANDARDS
The comm utility conforms to IEEE Std 1003.2-1992 (``POSIX.2'').
HISTORY
A comm command appeared in Version 4 AT&T UNIX.
BSD
June 6, 1993 BSD