Training scripts

[Clint Adams]

> 	#!/bin/sh

>    I would love to replace for cycles with find command, but I do 
>    not know how to pull it off:
>    
>       a) to run three commands from the same find command and
>          using the same {} variable twice, and

find /dir -exec firstcmd {} \; -exec secondcmd {} \; -exec thirdcmd \;

>       b) does anybody know how to avoid using STR variable (i.e.,
>          to use basename directly in ${...%..} bash expression)? 
>          ${$(basename $msg)%*:2,S} doesn't work.

This isn't a valid POSIX construct.  You could do it in zsh, though you
wouldn't need to (you'd use ${${msg:r}%*:2,S} instead).

Also, if you're going to use bashisms, you should change the top line to
be #!/bin/bash, or else someone may run into trouble if you share your
script with them.

>    #!/bin/sh
>    find $HOME/.mail/_junk -type f -name 10\* \
>        -exec formail -I "X-Bogosity:" -I "X-KMail" -ds \
>          < '{}' >> $HOME/spam \;
> 
>    I get error ``./bogocorpus: line 5: {}: neither file nor \
>    directory'' (translation to English from localized error 
>    messfge). Any thoughts on this? 

What you are doing here is trying to redirect the contents of the file
'{}' to find, and send the output of find to $HOME/spam.  Unless your
copy of find is capable of redirecting file descriptors or automatically
passes -exec clauses to a command interpreter, you'd have to do something
like fork a shell for every single formail exec.