10-12-2006
Hi ronald_brayan,
When you give a command like: 'tar cvf test.tar *.txt', what happens is that the shell parses the entire input line. It sees that you are supplying a "*.txt" pattern, so it checks in the current directory for that pattern and replaces that pattern with any files that it finds.
So after the shell is done with the parsing, the command that is executed is:
'tar cvf test.tar out.txt'
In the second case your pattern is just "*". So the shell replaces it with all the files and directories in the current directory. So the command that is executed is the same as:
'tar cvf test.tar A B C out.txt'.
The directories A, B and C and the file out.txt are sent in as args to the tar command, and tar includes any files inside directories in the tar archive. If you put in any more files in the A, B or C directories and run the tar with '*' as the arg, you will find that those files are in the tar archive as well.
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LEARN ABOUT CENTOS
bf_tar
BF_TAR(1) Bogofilter Reference Manual BF_TAR(1)
NAME
bf_tar - shell script to write a tar file of a bogofilter directory to stdout
SYNOPSIS
bf_tar [-r] [-R] bogofilter_directory
DESCRIPTION
bf_tar bundles a bogofilter working directory in tar format and copies it to standard output (your console, or where you redirect it, see
EXAMPLES below).
OPTIONS
The -r option causes bf_tar to remove inactive log files after the archive has been written successfully. The default is to leave log
files.
The -R option causes bf_tar to remove inactive log files before the archive is written. This may reduce chances that the resulting archive
is recoverable should it become damaged. The archive may be smaller though. The default is to leave log files.
EXIT STATUS
The script exits with status code 0 if everything went well, and nonzero if it encountered trouble.
EXAMPLES
o bf_tar ~/.bogofilter > outfile.tar
Writes a standard .tar file containing the essential files from ~/.bogofilter to outfile.tar.
o bf_tar ~/.bogofilter | gzip -9 -c > outfile.tar.gz
Writes a gzipped .tar.gz file containing the essential files from ~/.bogofilter to outfile.tar.gz.
o bf_tar `pwd`/mydirectory > outfile.tar
Prepend $(pwd)/ or `pwd`/ if you want to specify an absolute path instead of a relative path.
NOTES
This script is meant for use with Berkeley DB based bogofilter versions.
This script requires a SUSv2 compliant pax utility.
This script expects a SUSv2 compliant shell. Solaris systems should have the SUNWxcu4 package installed (when bogofilter is configured) so
that /usr/xpg4/bin/sh can be used.
AUTHORS
Matthias Andree
Bogofilter 10/22/2012 BF_TAR(1)