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Top Forums Shell Programming and Scripting Wget download file ( do not overwrite ) Post 302879797 by stefki on Sunday 15th of December 2013 11:30:52 AM
Old 12-15-2013
Wrench Wget download file ( do not overwrite )

Hello all,

I want to write auto update script for my embedded device, which can check and download newer version of my program and extract the files on the device.
The download center is hosted on remote web server .

Script checks the hosted file on web site and if the new version is there then download it to the embedded device and extract the files in the dirs. But if the test.tar.gz is already downloaded and the files are already extracted then do nothing.

The embedded device runs Linux.

Example, this script actually does the work, but It replace the files all the time. I don't want to overwrite the files.

Code:
#!/bin/sh
wget http:xxx.myftp.org:2322/add/test.tar.gz
tar -zxvf test.tar.gz -C /
rm test.tar.gz

 

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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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