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String replace that has spaces

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# 1  
Old 03-22-2012
String replace that has spaces
Code:
cat rf|nawk '/Use SSL=                0/{n+=1}{if (n==3){sub("Use SSL=                0","Use SSL=                0x1",$0)};print }' > rf2

Fails.

Code:
sed 's/Use SSL=              0/Use SSL=              0x1/g' rf > rf2

Fails.


In addition, the goal is to ONLY replace the 2nd occurence of the entire line, here's the line:

Code:
Use SSL=             0;          REG_DWORD

Want it changed to:
Code:
Use SSL=             0x1;          REG_DWORD

Notice it has all these spaces.

I've tried double, singe quotes, graves, no luck so far.

Any help is greatly appreciated.
Last edited by methyl; 03-22-2012 at 04:27 PM.. Reason: please use code tags. especially where space characters are important.
# 2  
Old 03-22-2012
Please post sample representative input from "rf" and sample matching output you would expect in "rf2". Please post in code tags so posters can see the space characters.
Though "nawk" says SunOS (or some older unix System V) to me, please post what Operating System and version you have and what Shell you prefer.

Ps "Fails" doesn't mention what actually happened !
# 3  
Old 03-22-2012
string replace that has spaces
The file 'rf' contains many lines of which several are identical, as follows:

Code:
Use SSL=                   0;            REG_DWORD

There may be 2-5 identical lines (to make it more complicated, the number of spaces between = and 0 and ; and REG_DWORD could be different on each line or they could be exactly the same.

The server os is solaris 8.

The several attempts made failed to replace the 0; with 0x1 while keeping the format intact;...by fail, nothing was replaced...as if the PATTERN was not recognized.

Thanks for helping.
Last edited by methyl; 03-23-2012 at 09:08 AM..
# 4  
Old 03-22-2012
Code:
printf "Use SSL= 0; REG_DWORD\nSomething\nUse SSL= 0; REG_DWORD\nUse SSL= 0; REG_DWORD\n" |
        awk '/Use SSL= *0 *; *REG_DWORD/ && ((++N)==2) { sub(/0/, "0x0"); } 1'

Use SSL= 0; REG_DWORD
Something
Use SSL= 0x0; REG_DWORD
Use SSL= 0; REG_DWORD

$

Last edited by Corona688; 03-22-2012 at 07:44 PM..
# 5  
Old 03-23-2012
string replace that has spaces
Thanks.

Can you explain what is happening with your recommendation?

It does not work as typed...what is 'something' supposed to be?
# 6  
Old 03-23-2012
In what way does it 'not work'? What does it do? Show exactly what you did, word for word, letter for letter, keystroke for keystroke.

'something' is a string which is not "Use SSL= 0; REG_DWORD", to demonstrate that it does as you ask, only counting matches of lines like "Use SSL= 0; REG_DWORD". It matches the first one and ignores it, matches the second one and changes it, and does nothing thereafter.
# 7  
Old 03-23-2012
In the "sed" in post #8 there is one too many space both sides of the replace.
If we correct the number of spaces in the "sed" it appears to work.
Code:
                        echo "Use SSL=             0;          REG_DWORD" | \
sed 's/Use SSL=             0/Use SSL=             0x1/g' 

./scriptname
Use SSL=             0x1;          REG_DWORD

c/f oribinal line
Code:
Use SSL=             0;          REG_DWORD


It will take a "sed" expert to replace the second occurrance (and subsequent?). Not really clear what is required without a better before and after example.
Last edited by methyl; 03-23-2012 at 12:21 PM..
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