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[Lee Forrest <lforrestster AT gmail.com>]

On Sat, Feb 03, 2007 at 06:43:13PM +1300, 3aoo-cvfd AT dea.spamcon.org wrote:
> > > clear
> > > num=1
> > > set  "/" "/bin" "/dev" "/etc" "/home" "/lib" "/proc" "/root" "/sbin" 
> > > "/usr" "/var" ".." `/bin/ls -F`
> > > for file in "$@" ; do
> > > printf "%-20s" "[${num}] $file"
> > > [ `dc $num 4 mod` = 0 ] && echo   
> > > num=`expr $num + 1`
> > > done
> >
> > [11] /var           [: 0: unknown operand
> >
> > It turns out to be a bug in the dc in BL3 busybox.
> 
> You can get the script to work on BL3, by replacing the 
> dc line with this:
> ------------------------------------------------------------
> case $num in 4|8|12|16|20|24|28|32|36|40|44|48|52|56|60)echo   
> esac
> ------------------------------------------------------------
> 
> It's not very elegant, but at least it works on BL3.

I beg to differ. That is a _most_ elegant hack.

This works beautifully:

#!/bin/sh

clear
num=1
set  "/" "/bin" "/dev" "/etc" "/home" "/lib" "/proc" "/root" "/sbin" "/usr" 
"/var" ".." `/bin/ls -F`
for file in "$@" ; do
printf "%-20s" "[${num}] $file"
case "$num" in
4|8|12|16|20|24|28|32|36|40|44|48|52|56|60) echo ;;
esac
num=`expr $num + 1`
done

----------------

[1] /               [2] /bin            [3] /dev            [4] /etc          
  
[5] /home           [6] /lib            [7] /proc           [8] /root         
  
[9] /sbin           [10] /usr           [11] /var           [12] ..           
  
[13] cardmgr        [14] chat           [15] install-to-hd  [16] lsof         
  
[17] nc@            [18] pppd           [19] pure-authd     [20] pure-ftpd    
  
[21] pure-ftpwho    [22] pure-mrtginfo  [23] pure-quotacheck[24] 
pure-uploadscript
[25] receive        [26] send           [27] tcpdump        [28] special/

I sure appreciate the help, Steven. Now I will sit down and play
with your formatting improvements until I understand them.

I saw your posts on dc, about needing the p option. I'd have never figured 
that
out.

But I like your case hack (it _would_ be more portable) and now I
have _two_ ways to do the same thing, which means that I'll have
an easier time understanding what's going on.

And I now know I have a commandline calculator.

Although I discovered you could do that with calctool, basically. 

Now give me one good reason why I should keep calctool around since I
have dc! I do not do fancy mathemtics. Simple algebra is about it, and
all that needs is * and / and + and - and square root, all of which
dc does....


Lee

-- 
BasicLinux: Small is Beautiful
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