Read a file line by line


 
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# 1  
Old 07-24-2009
Read a file line by line

Hi everybody,

I have a config file what looks like this

Code:
# name name
#host TYPE-IFTYPE-user{
#       hardware ethernet 00:00:00:00:00:00;
#       fixed-address 0.0.0.0;
#}

## unknown
#host TYPE-IFTYPE-USER{
#       hardware ethernet 00:00:00:00:00:00;
#       fixed-address 0.0.0.0;
#}

# name name
#host TYPE-IFTYPE-user{
#       hardware ethernet 00:00:00:00:00:00;
#       fixed-address 0.0.0.0;
#}

## unknown
#host TYPE-IFTYPE-USER{
#       hardware ethernet 00:00:00:00:00:00;
#       fixed-address 0.0.0.0;
#}

so what i want is to write a script what reads the config file line by line and print only the unknown patterns and the following three lines into a text file.

I dont know how to tell the script read from here to here begin at every unknown pattern.

Please help me

thanx
# 2  
Old 07-24-2009
Code:
grep -A3 'unknown' cfgfile

# 3  
Old 07-24-2009
This works nice!!!Smilie

Thank you very much!!!
# 4  
Old 07-24-2009
Code:
 sed -n '/unknown/{N;N;N;p;}' file

# 5  
Old 07-24-2009
works too!!!

thanks
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