Matt Schalit wrote:
>
> David Douthitt wrote:
> [snip]
>
> Ok. I get it. As an aside,
>
> > $(ipmask -c $IPADDR)
>
> Is that notation Bourne Shell? Or is
> that something else?
Korn Shell.
> I realize it looks like
> you're asking for a subshell to be spawned,
> then the ipmask command to be evaluated, and
> the result returned, but why not
>
> `ipmask -c $IPADDR`
It's the same thing. However, with the Korn Shell you could do
something like this:
$(ipmask -c $(ifconfig eth0 | grep "172.16"))
...nested commands...
> I don't want to get into learning ksh or something
> else if it's not Bourne at this time.
ksh is compatable but extends Bourne shell in FANTASTIC ways - command
line editing; variable pattern matching and substitution (extending the
${VAR:-XXX} type syntax); nested commands; command history; enhanced cd;
job control; command aliases; array variables; tilde expansion.
Much of what LRP uses is ksh-style code, as ash and bash support most of
ksh. However, I prefer to go with the real thing and use pdksh (except
for ash and LRP).
Back when I used csh as my prefered interactive shell, I used ksh for
writing all my scripts - instead of sh or csh. Now I use ksh
exclusively.
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