awk or sed question 1

[hok1man]

Hi guys,

echo "xx pts/19 Mar 4 03:16 (10.2.3.20)"

I would like to get :
10.2.3.20

I tried
nawk '{sub(/\(|\)/,"");print $NF}'
the result

10.2.3.20)

but if i tried nawk '{sub(/\)/,"");print $NF}'
result
(10.2.3.20

seems like my "or" "|" operator doesnt work,
anyone can nail it?

It would be nice if someone can tell me in sed as well but one liner..

thanks.

 

[SamBones]

For [tt]sed[/tt]...

echo "xx  pts/19   Mar 4 03:16   (10.2.3.20)" | sed 's/^..*(//1;s/).*$//1'

 

[hok1man]

Thanks Sambone,

what about if the logic I need is :
grab the last column or column 4 (in this case) and substitue (,) with nothing.

Thanks,

 

[columb]

Alternatively

echo "xx  pts/19   Mar 4 03:16   (10.2.3.20)" | sed 's/^.*(\([^)]*\)).*$/\1/'

Sam's version replaces everything up to the opening bracket with nothing, and then everything after and including the closing bracket with nothing.

My version replaces a whole line consisting of anything ending in an opening bracket{.*(}, then some not closing brackets{[^)]*}, then a closing bracket followed by anything {).*}, with the bit between the brackets{\1}.

Whichever you understand best is fine.

For your awk version try

echo "xx  pts/19   Mar 4 03:16   (10.2.3.20)" |  awk  -F "[()]" '{print $2}'

you may have to try nawk for this. Notice that the field separator is a regular expression.

On the internet no one knows you're a dog

Columb Healy

 

[geirendre]

You meen like this?

echo "xx    pts/19       Mar  4 03:16    (10.2.3.20)" | awk '{ print $NF }' | sed 's/[/(/)]//g'
10.2.3.20

Or a shorter version:

echo "xx    pts/19       Mar  4 03:16    (10.2.3.20)" | awk -F[\(\)] '{ print $2 }'
10.2.3.20

 

[columb]

Ok, so you asked for

what about if the logic I need is :
grab the last column or column 4 (in this case) and substitue (,) with nothing.

Then try gsub which uses

echo "xx  pts/19   Mar 4 03:16   (10.2.3.20)" | awk '{gsub ( "[()]", "", $NF ); print $NF}'

The problem in your original version was that the first parameter to sub or gsub is a regular expression and the regexp for both brackets is [()]



On the internet no one knows you're a dog

Columb Healy