sed help 3

[aswolff]

I am on Solaris 9. I am trying to use sed for a simple regexp.

I have the text "123 Juice". I would like sed to just display the "123".

My command:

echo "123 Juice" | sed "s/(\d\d\d)\s\w+/\1/"

returns

sed: Command Garbled




Thanks.

 

[taupirho]

Err... sed "s/123 Juice/123/"




In order to understand recursion, you must first understand recursion.

 

[aswolff]

I guess I was looking for a more general form so that I can tackle a more challenging problem:

Given the output of the unix command 'id'
display the contents within the first set of parentheses

uid=80(userid) gid=80(groupid)

return: userid

Thanks.

 

[p5wizard]

why sed?

cut -d' ' -f1

or

awk '{print $1}'


HTH,

p5wizard

 

[aswolff]

Why does'nt this return what's inside the first set of parenthese?

id | awk '{print $1}' | sed -e "s/(\(.+\))/$1/

 

[p5wizard]

id | awk -F '[()]' '{print $2}'


HTH,

p5wizard

 

[aswolff]

Hmmm...that returns an error:

awk: syntax error near line 1
awk: bailing out near line 1

I tried the below:

id | awk '{print $1}' | awk -F'(' '{print $2}'

and it returned:

userid)

I I could just get rid of the trailing ) I would be all set.

 

[aswolff]

I finally get my desired result but it's ugly. I am looking for a more elegant solution (Slow day at work!)

id | awk '{print $1}' | awk -F'(' '{print $2}' | sed -e "s/)//g"

There has got to be a nicer looking solution?

 

[p5wizard]

try nawk instead:

id | nawk -F '[()]' '{print $2}'

or if that doesn't do it

id | tr '()' '::' | awk -F':' '{print $2}'

HTH,

p5wizard

 

[aswolff]

id | nawk -F '[()]' '{print $2}'

worked as well. Thanks p5

 

[columb]

Back with your original question - I don't think that sed understands the \d, \s or \w so

echo "123 Juice" | sed 's/([0-9]+) [A-z]+/\1/'

will do what you want.

Having said that the Lemur book allows for the Posix classes [:alnum:], [:alpha:], [:digit:] and [:space:] (amoungst others) so

echo "123 Juice" | sed 's/([:digit:]+)[:space:]+[:alnum:]+/\1/'

is what you were trying to write.

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Columb Healy