On Thu, 2005-10-13 at 08:18 -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 =
if a is unset then that is correct...
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
this is a listing of your current directory...
Now in my playing around this morning I've been using some command
substitution from the bash prompt that included cd'ing into a directory
that has the files in it that are listed above. I assume that somehow
setting $b to the value I set it to is calling the history command in
the bash shell and that's how I'm getting this output. However, I don't
know why or how it works.
if you have not editted your .bash* files, re-login afresh and try
again. the preceeding para implies you may have (inadvertedly) done
something to, say, .bashrc so it executes something on certain
conditions and this is where the `ls` output is from.