Brandon S. Allbery KF8NH wrote:
> On Nov 30, 2009, at 21:20 , Tom Limoncelli wrote:
>> This sounds like a job of sed but my sed fu is weak.
>
> Not really; sed can be abused into that kind of conditionality, but
> it's not simple. Redefine the spec so that an existing block is
> deleted but the new block goes at the end always, and you have a
> sed-type job.
>
> This can, on the other hand, be fairly easily done with awk. It's
> still not a one-liner, though.
I'm with Brandon on using awk. My definition of one line might be more
flexible than his, using flags.
something like this for your body
awk '$2 == "BEGIN" {begun=1; print lines;} begun != 1 {print $0}; $2 ==
"END" {begun = 2;}
But you'll also want a BEGIN block that opens and reads in rc-addition..
Something like this:
awk 'BEGIN {while (getline line < "/tmp/rc-addition") {lines = lines
"\n" line}}
putting it all together:
awk 'BEGIN {while (getline line < "/tmp/rc-addition") {lines = lines
"\n" line;}} $2 == "BEGIN" {begun=1; print lines;} begun != 1 {print
$0}; $2 == "END" {begun = 2;} END {if (begun == 0) {print lines}}'
/tmp/rc-machine
The END also has a flag, so if it never found a start block, then it
will print what you snarfed in from rc-addition.
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