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Extracting IP's from a file

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# 1  
Old 08-18-2006
Extracting IP's from a file
I've been trying to work out a way to extract IP's from a file. The IP's are contained withing brackets like this:
[xxx.xxx.xxx.xx]
is there a way to extract just the IP's or at least everything from the starting to ending bracket with grep or something similar?

Thanks in advance.
# 2  
Old 08-18-2006
cat filename | cut -f2 -d [ | cut -f1 -d ] > new_filename
# 3  
Old 08-18-2006
Quote:
Originally Posted by DukeNuke2
cat filename | cut -f2 -d [ | cut -f1 -d ] > new_filename
is 'cat' really necessary?
# 4  
Old 08-18-2006
Quote:
Originally Posted by eth0
I've been trying to work out a way to extract IP's from a file. The IP's are contained withing brackets like this:
[xxx.xxx.xxx.xx]
is there a way to extract just the IP's or at least everything from the starting to ending bracket with grep or something similar?

Thanks in advance.
post a sample file and indentify what parts of it you want to extract.
# 5  
Old 08-18-2006
cut -f2 -d [ filename | cut -f1 -d ] > new_filename

this works also... and without the "cat"
# 6  
Old 08-18-2006
That won't work if the ip addresses are interspersed everywhere throughout the file, i.e. if the file looks like this:

Code:
foo [999.999.999.991] [999.999.999.992] bar
[999.999.999.993]
foo
[999.999.999.994] foo
foo bar
foo [999.999.999.995]
[999.999.999.996] foo bar [999.999.999.997]

This (clunky) bit should work:
Code:
words=$(<file.txt)
for word in $words; do
  echo $word | grep "\[" | awk '{gsub("\[|\]","",$0); print}'
done

Code:
999.999.999.991
999.999.999.992
999.999.999.993
999.999.999.994
999.999.999.995
999.999.999.996
999.999.999.997

# 7  
Old 08-18-2006
Still clunky but faster and using shell built-ins and no additional processes
Code:
for word in $(<file.txt)
do
    [[ $word != \[* ]] && continue
    word=${word#\[}
    print ${word%\]}
done
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