[ale] multi-file string swap

[Jim Kinney]

Cool. I have a working solution now. I have enough files getting
dropped from a tarball that another for a sed script won't make a blip
:-)

autoexecute tarballs are wickedly useful.

On Tue, Aug 4, 2009 at 5:44 PM, Richard Bronosky<Richard at bronosky.com> wrote:
> Don't have much time so I'll outline for now.
> *use awk for most of this, and a little vimming. Don't get too fancy
> with overly complex | and $() nests
> 1 generate an awk script that will delete the unwanted lines in one pass. Use it
> 2 generate an sed script _file_ that do the replacements. Use the
> script file (-f I believe) instead of trying to get it included as a
> script string.
>
> If you don't have it by 8pm I'll give more detail.
>
> On 8/4/09, Jim Kinney <jim.kinney at gmail.com> wrote:
>> OK. Last technique hunt for the day. really.
>>
>> 2 files, /etc/hosts and /home/foo/.ssh/known_hosts (that makes for
>> long lines and different location delimeters)
>>
>> hosts has :
>>
>> ip name1 name2
>>
>> known_hosts has:
>> name1,ip ssh-rsa <long string>
>>
>> I need to change name1 in known_hosts to name2 from /etc/hosts
>>
>> I'm looking at creating a string from each line in /etc/hosts as
>> name1,ip and doing a sed substitution for name2,ip in known_hosts.
>>
>> A fun thing is not all hosts files have name2. Those I don't want to
>> tinker with anywhere.
>>
>> So I have the following which outputs a space separated
>> pattern/substitution set: (yay!)
>>
>> grep -v "^127" </etc/hosts | grep "^[0-9]" | awk '{$2=tolower($2); if
>> ($3)  print $2","$1,$3","$1 }'
>>
>> Next step is to actually do the substitution. I tried adding more to
>> the above line as:
>>
>> | awk '{ system(" sed -i \"s/$1/$2/\" known_hosts ") }'
>>
>> but no joy:
>>
>> sed: -e expression #1, char 0: no previous regular expression
>>
>> So I've poked and fiddled with the " and ' and added backslashes until
>> it looks like perl code with no solution yet.
>>
>> So then I tried just echo'ing the strings thinking they will show up
>> as positional parameters $1 and $2.
>>
>> | echo "$1 $2" gave nothing. I'm rather puzzled and expecting it's
>> something simple yet subtle I'm missing.
>>
>> Ideas?
>>
>> --
>> --
>> James P. Kinney III
>> Actively in pursuit of Life, Liberty and Happiness
>> _______________________________________________
>> Ale mailing list
>> Ale at ale.org
>> http://mail.ale.org/mailman/listinfo/ale
>>
>
> --
> Sent from my mobile device
>
> .!# RichardBronosky #!.
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>



-- 
-- 
James P. Kinney III
Actively in pursuit of Life, Liberty and Happiness