[Discuss] Bash question

[John Blomfield]

Thanks Noel and Andrew for your suggested code. Unfortunately, both your 
suggestions are a little beyond my comfort level when it comes to bash 
scripts and I have decided to use the following approach:

if [ -n "$1" ]
# Test whether command-line argument is present (non-empty).
then
   ..........use these rsync options
else
   ...........use these rsync options
fi

That lets me view the output or redirect it to log files (but not both). 
However I don't really need to have both just one or the other will do 
fine. I will run the cron job with no argument and then run it with an 
argument from a terminal when required.

Actually, the script already includes a few Kdialog GUI popup messages 
reminding me to plug a USB backup drive, when errors occur and when its 
finished successfully, so on a miserable winter day when I am looking 
for a project I plan to re-write the whole thing as a Python script or 
as a Qt4/C++ GUI with a KDE4 Plasma panel notifier and if I get really 
bored I will add a Gnome notifier, which should work in Cinnamon. I 
really do need to keep my old brain active as I have written little code 
of late.

John



On 08/16/2014 11:36 PM, Noel Burton-Krahn wrote:
> Hi John,
>
> I use 'tail -f' to save the output of a program and watch it at the 
> same time:
>
>     make >make.out 2>&1 & tail -F make.log
>
>
> Note, Ctrl-C will kill tail, not the make session above.  You have to 
> kill make explicitly if you want to stop it:
>
>     kill %-
>
>
>
> Sometimes you make want to start a long running program and be able to 
> log in from time to time to see how it's doing.  I start it in a 
> screen session:
>
>     screen -d -m -S myscreen tcpdump  -veplni host
>
>
> Then later while it's running I can log in from a different session 
> and check up on it
>
>     screen -dr myscreen
>
> Or kill it:
>
>     screen -X -S myscreen quit
>
>
> HTH
> --
> Noel
>
>
> On Fri, Aug 15, 2014 at 3:24 PM, John Blomfield <jabfield at shaw.ca 
> <mailto:jabfield at shaw.ca>> wrote:
>
>     Here is a snippet from a bash script cron job I run:
>
>     .............
>     if rsync -avz --delete --exclude=lost+found $SOURCEDIR $DESTDIR 1>
>     $DEBUGLOG 2> $ERRORLOG; then \
>     ..........
>
>     Occasionally, I need to run this script manually in a terminal and
>     would like to see the output in the terminal as well as saving it
>     to the debug and error log files. Any suggestions?
>
>     -- 
>     John Blomfield
>     Delivered by Thunderbird Email on Linux OpenSuse-KDE4
>
>     Old John B's Linux Notes http://www.oldjohnbslinux.wordpress.com
>
>
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>


-- 
John Blomfield
Delivered by Thunderbird Email on Linux OpenSuse-KDE4

Old John B's Linux Notes http://www.oldjohnbslinux.wordpress.com


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