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String extraction from a text file

 
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# 1  
Old 04-13-2009
String extraction from a text file
The following script code works great for extracting 'postmaster' from a line of text stored in a variable named string:
Code:
string="PenaltyError:=554 5.7.1 Error, send your mail to postmaster@LOCALDOMAIN"
stuff=$( echo $string | cut -d@ -f1 | awk '{ print $NF }' )
echo $stuff

However, I need to be able to get that line of text out of a text file rather than being in a variable, and I cannot for the life of me figure out how to do it.

Can anyone please help?

Thanks.
# 2  
Old 04-13-2009
you can grep it.
grep youtext filename | cut ...........
# 3  
Old 04-13-2009
Quote:
Originally Posted by cleanden
The following script code works great for extracting 'postmaster' from a line of text stored in a variable named string:
Code:
string="PenaltyError:=554 5.7.1 Error, send your mail to postmaster@LOCALDOMAIN"
stuff=$( echo $string | cut -d@ -f1 | awk '{ print $NF }' )
echo $stuff

However, I need to be able to get that line of text out of a text file rather than being in a variable, and I cannot for the life of me figure out how to do it.

Can anyone please help?

Thanks.
you mean you have that line in a file and you want to extract that line from a file??
or
you want to extract that line and from that line you want only string with @LOCALDOMAIN??
# 4  
Old 04-13-2009
That line is in a file and ultimately I need to get to 'postmaster'
I can do it by hard-coding that line into a variable but I cannot figure out the grep cut command to get it out of the file.
# 5  
Old 04-13-2009
Quote:
Originally Posted by cleanden
That line is in a file and ultimately I need to get to 'postmaster'
I can do it by hard-coding that line into a variable but I cannot figure out the grep cut command to get it out of the file.
then i don't know whats the point.. anyways
Code:
 
awk 'BEGIN{RS="@"}/postmaster/{print $NF}{exit}' filename

# 6  
Old 04-13-2009
The point that I guess I failed to make is that postmaster is not a static piece of text - it could be anything, but I know it always precedes @LOCALDOMAIN
# 7  
Old 04-13-2009
Quote:
Originally Posted by cleanden
The point that I guess I failed to make is that postmaster is not a static piece of text - it could be anything, but I know it always precedes @LOCALDOMAIN
thats what i asked you
Quote:
you mean you have that line in a file and you want to extract that line from a file??
or
you want to extract that line and from that line you want only string before @LOCALDOMAIN??
try this
Code:
 
awk '/@LOCALDOMAIN/{split($NF,A,"@")}{print A[1]}' filename

 
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