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Extracting IP's from a file

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Top Forums Shell Programming and Scripting Extracting IP's from a file
# 8  
Old 08-18-2006
Wierd. I get no results when I use your code:
Code:
for word in $(<ip.txt)
do
    if [[ $word = \[* ]]; then
      word=${word#\[}
      print ${word%\]}
    fi
done

But it works if I do
Code:
for word in $(<ip.txt)
do
    if [[ $word = \[[0-9]* ]]; then
      word=${word#\[}
      print ${word%\]}
    fi
done

# 9  
Old 08-18-2006
Quote:
Originally Posted by Glenn Arndt
Wierd. I get no results when I use your code:
Curious, what shell are you using?
# 10  
Old 08-18-2006
ksh88. I can tell that (for whatever reason) it's not matching $word to \[* but it does match it to \[[0-9]*. The xtrace is showing
Code:
[3]+ [[ foo = [* ]]              
[3]+ [[ [999.999.999.991] = [* ]]
[3]+ [[ [999.999.999.992] = [* ]]
[3]+ [[ bar = [* ]]

...which looks like it should match. But it doesn't.
# 11  
Old 08-18-2006
Now I see it. My example was testing for inequality yours is test for equality.
# 12  
Old 08-18-2006
Well, yes. I actually misrepresented your code, which really was:
Code:
for word in $(<file.txt)
do
    [[ $word != \[* ]] && continue
    word=${word#\[}
    print ${word%\]}
done

It doesn't return anything for me. If however, I only add the [0-9], as in:
Code:
for word in $(<file.txt)
do
    [[ $word != \[[0-9]* ]] && continue
    word=${word#\[}
    print ${word%\]}
done

It works. Why is that?
# 13  
Old 08-18-2006
Quote:
Originally Posted by Glenn Arndt
Well, yes. I actually misrepresented your code, which really was:
Code:
for word in $(<file.txt)
do
    [[ $word != \[* ]] && continue
    word=${word#\[}
    print ${word%\]}
done

It doesn't return anything for me.
I don't know why unless our input files are different.
Code:
 $ cat file.txt 
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]

The proof:
Code:
{
set -x
for word in $(<file.txt)
do
    [[ $word != \[* ]] && continue
    word=${word#\[}
    print ${word%\]}
done
set +x
}
+ 0< file.txt
+ [[ foo != [* ]]
+ continue
+ [[ [999.999.999.991] != [* ]]
+ word=999.999.999.991]
+ print 999.999.999.991
999.999.999.991
+ [[ [999.999.999.992] != [* ]]
+ word=999.999.999.992]
+ print 999.999.999.992
999.999.999.992
+ [[ bar != [* ]]
+ continue
+ [[ [999.999.999.993] != [* ]]
+ word=999.999.999.993]

Quote:
Originally Posted by Glenn Arndt
If however, I only add the [0-9], as in:
Code:
for word in $(<file.txt)
do
    [[ $word != \[[0-9]* ]] && continue
    word=${word#\[}
    print ${word%\]}
done

It works. Why is that?
That is self evident in your example's case. It should work but I can't answer why mine won't work for you. I too am using KSH88.
# 14  
Old 08-18-2006
That's bizarre. Our input files are identical. Your code gives me:
Code:
[1]+ [[ foo != [* ]]              
[3]+ continue                     
[3]+ [[ [999.999.999.991] != [* ]]
[3]+ continue                     
[3]+ [[ [999.999.999.992] != [* ]]
[3]+ continue                     
[3]+ [[ bar != [* ]]              
[3]+ continue                     
[3]+ [[ [999.999.999.993] != [* ]]
[3]+ continue                     
[3]+ [[ foo != [* ]]              
[3]+ continue                     
[3]+ [[ [999.999.999.994] != [* ]]
[3]+ continue                     
[3]+ [[ foo != [* ]]              
[3]+ continue                     
[3]+ [[ foo != [* ]]              
[3]+ continue                     
[3]+ [[ bar != [* ]]              
[3]+ continue                     
[3]+ [[ foo != [* ]]              
[3]+ continue                     
[3]+ [[ [999.999.999.995] != [* ]]
[3]+ continue                     
[3]+ [[ [999.999.999.996] != [* ]]
[3]+ continue                     
[3]+ [[ foo != [* ]]              
[3]+ continue                     
[3]+ [[ bar != [* ]]              
[3]+ continue                     
[3]+ [[ [999.999.999.997] != [* ]]
[3]+ continue

Maybe I have something set differently?

Update:
It works if I quote the \[:
Code:
for word in $(<file.txt)
do
    [[ $word != "\["* ]] && continue
    word=${word#\[}
    print ${word%\]}
done

Last edited by Glenn Arndt; 08-18-2006 at 03:07 PM..
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