On Monday 09 October 2006 10:04, Sasha Dolgy wrote:
> I'm currently trying to write a simple bash shell script that
> recursively loops through a directory and for each directory entry
> will mirror the contents to a remote backup server. In principal
> everything works fine when i step through the commands step by step.
Which shell are you using? (echo $SHELL)
> One big issue I am having however is integrating the commands into a
> shell script.
>
> One of the limits of shell scripting, is that by placing single quotes
> ( ' ) within a shell script, variable expansion doesn't occur between
> the single quotes ..
This is not a limitation, it is a feature. Use double quotes if you want
variable expansion.
> #!/bin/sh
> backupDirectory="/tmp/somedir/for/backups"
Here you don't need double quotes.
> for backupDir in `ls -1 ${backupDirectory}/`;
> msg="attempting backup on ${backupDir}: -- [ "
> cmdString="mirror -R ${backupDirectory}/${backupDir}
> backups/${backupDir}" # no keyword expansion
Yes, you have variable expansion here..
> ${ftpProgram} -c 'open -e \"${cmdString}\" ${siteUrl}'
.. but here you don't.
Try this:
${ftpProgram} -c "open -e '${cmdString}' ${siteUrl}"
(Note: untested!)
> # no errors , return code of 0 but doesn't transfer files remotely
> # ${ftpProgram} -c \'open -e \"${cmdString}\" ${siteUrl}\'
>
> cmdStatus=${?}
> if [ ${cmdStatus} -gt 0 ]; then
What if the return status is -1?
> msg="${msg} failed ] --"
> else
> msg="${msg} success ] --"
> fi
> done
>
> The above is what I have. The variables aren't expanded. When I
> escape the single quotes with a backslash ( \ ) the command is shown
> properly and returns a return code of 0 -- ( $? == 0 ) . . however,
> nothing is actually done. I can confirm this when I run it command
> line with the single quotes escaped.
>
> Now, I realize that my problems are more limitations with the shell
> scripting environment I'm using rather then lftp, however, I'm
> emailing in hope that someone on this list knows of another way I can
> work around this?
Again. This is not limitations, but misusage. If you want to improve your
shell scripting abilities I recommend trying google: abs bash. This will give
you The Advanced Bash-Scripting Guide. Chapter 5.1 I believe should clear
some of your misunderstandings out.
I'm sure you can do all of this using lftp only... Try using the recursive
mirror command directly on the backupDirectory.
--
Bjørge
