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Full Discussion: How to make Shell script of using tar command?
Top Forums Shell Programming and Scripting How to make Shell script of using tar command? Post 302930867 by RavinderSingh13 on Thursday 8th of January 2015 08:01:41 AM
Old 01-08-2015
Quote:
Originally Posted by aaditya321
Please let me meaning of sub(/\.\//,X,$0)
Hello aadiya321,

Please note that when we willl run the find command as follows.
Code:
find -maxdepth 1 -type f

It will provide us output as follows.(Just some example files in my system.)
Code:
./get_data
./bcd.txt
./abc.txt
./testtest1
./check420
./check13
./check2

So in order to remove ./ before filenames I have used that expression, whose explaintaion is as follows.
Code:
sub(/\.\//,X,$0)  #### sub is the utility in awk to perform substitution operation in 
                          ####sub(pattern or regular expression, substitue with string/var, in string). 
                          ####So match ./(which I have escaped here by \as they are Meta characters here) then substitute them with 
                          ####a variable named X(which has NULL value) and perform this on $0 means whole line.

Hope this helps.

Thanks,
R. Singh
 

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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)
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