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Re: keeping the two latest files on a folder



On Sun, Oct 18, 2009 at 08:09:21PM +0200, Javier Barroso wrote:
[...]
> > I've just want to change on a file this line:
> >
> > vif = [ 'ip=167,112,134.223,mac=00:16:3E:FD:58:B8']
> >
> > to:
> >
> > vif = ['ip=167,112,134.223,mac=00:16:3E:FD:58:B8,vifname=veth216','ip=10.1.1.1,mac=00:16:3E:FD:58:BB,vifname=veth216a']
> >
> > AND, if it's possible to change tha last two entries of mac address,
> > B8 to C8 for example..
> 
> sed -i '/^vif/s/B8.*$/C8,vifname=veth216'"'"','"'"'ip=10.1.1.1,mac=00:16:3E:FD:58:BB,vifname=veth216a'"'"']'
> file.cfg
> 
> As it is dificult to read see this explication:
> If you want to use a ' inside replace string such is the case you must:
> type ' to close string
> Then type " to open a new concatenated string
> type ' to write '
> type " to close the concatenated string
> type ' to concatenate the next string (following with the replace
> string)

is it not clearer and easier to use double-quotes for the string and
then just escape the single quotes?

/tmp $ echo hello | sed "s/ll/l\'/"
hel'o

works just fine, and

sed -i "/^vif/s/B8.*$/C8,vifname=veth216\',\'ip=10.1.1.1,mac=00:16:3E:FD:58:BB,vifname=veth216a\']" file.cfg

seems, to me at least a little more readable.

.02, ymmv etc.

A

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