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Re: Bash commands



$a is unset.


Rob Sims wrote:

On Thu, Oct 13, 2005 at 08:18:05AM -0700, Freddy Freeloader wrote:
Hi all,

I downloaded the Advanced Bash Scripting Guide the other day an have started to work my way through it. I'm fairly new to bash so I get more than a little confused when the output I get is nothing similar to what the ABS Guide says it should be.
Here is what has me confused at the moment.

b=${a/23/BB}

echo "b = $b"

Now the ABS guide says that where I'm setting b it should be substituting BB for 23. It also says that the output of 'echo "b - $b"' should be: b = BB35

However, what I get as output is as follows:

ffreeloader@Job:~$ echo "b = $b"
b = total 520716
drwxr-sr-x  2 ffreeloader ftp        48 2005-10-13 07:50 script
-rw-r--r--  1 ffreeloader ftp 532692172 2005-10-12 09:38 server_2003.zip

What does the last line containing 'a=' look like? b=${a/23/BB} sets b = a if a contains no '23.'



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