On Tue, Aug 16, 2011 at 02:11:43PM -0700, Linda Walsh wrote:
> 2) His knowledge base about bash seems to be dated or lacking.
> His page on indirect assignment skips using arith expressions and skipped
> one line assignments for assigning to indirect vars using the "<<<"
It's a wiki, you know. It can be, and has been, edited by others. You
could update it yourself. I very rarely reject any contributions from
others. If something doesn't work, I'll usually at least attempt to
fix it up rather than reverting it.
> but he totally doesn't talk about
> > b=0
> > a=b
> > (($a=32)
> > echo $b
> 32
imadev:~$ a=b
imadev:~$ (($a=string))
bash: ((: number1 number2 number3 number4: syntax error in expression (error
token is "number2 number3 number4")
"Oops!"
Your trick is limited to numbers. And not even real numbers, either:
imadev:~$ (($a=2.3))
bash: ((: b=2.3: syntax error: invalid arithmetic operator (error token is ".3")
Just integers.
> >>>>[1]prefix="snapdir/@GMT-"
> >>>>[2]snap_today="$(date +%Y.%m.%d-)"
> >>>>[3]snap_prefix="$mp/$prefix$snap_today*"
> >>>>[4]today_snaps="$('ls' -1 ${snap_prefix} 2>/dev/null |tr "\n" " " )"
Don't store lists in a string. Store them in an array.
...
snapglob="$mp/$prefix$snap_today*"
today_snaps=($snapglob)
Make sure "set -f" is not in effect, obviously.
