stupid question on for loop

[soleblazer]

Gents/Ladies,

I have what is probably a stupid question, but I cant figure it out.

In bash, is it possible to do arithmetic next to alphas in a for loop? Here is what I'm trying to do:

for tape in LNX001-LNX200
do
vmchange -h <hostname> -new_mt hcart3 -m $tape
done

Now, LNX001-LNX200 is LNX001 to LNX200, is there an easy way to do this, have it loop through LNX001, LNX002, and so forth?

[xrx]

How about this:


for tape in `seq -f LNX%03g 1 200`
do
echo $tape
vmchange -h <hostname> -new_mt hcart3 -m $tape
done

[asarch]

Or even better:

This is for the TCSH shell but it will give you an idea:


#!/bin/tcsh -f

set I = 1

while ($I <= 2000)
if ($I < 10) then
set DEVICE = "LNX00$I"
endif

if ($I > 10 && $I < 100) then
set DEVICE = "LNX0$I"
endif

if ($I > 100) then
set DEVICE = "LNX$I"
endif

echo $DEVICE

@ I ++
end

Copy and paste on a file called count.csh and run it from any shell:


[$] ./count.csh
...

[soleblazer]

dang, forgot about seq, that works nicely!

Thanks alot!

[xrx]

Or even better:
...

There is an error in the if statements though. It doesn't handle numbers like 10 and 100, because none of the if statements cater for it, so LNX010 and LNX100 is missed.
Besides:

xrx@therm-sempron:~/temp/forumJL$ time ./count.csh > /dev/null

real 0m0.682s
user 0m0.464s
sys 0m0.192s
xrx@therm-sempron:~/temp/forumJL$ time ./seq-count-2000.sh > /dev/null

real 0m0.100s
user 0m0.064s
sys 0m0.016s



;)

However, your code is more customizable though, if there happened to be more exotic requirements, your style would work better.