SED Sctipt

[stu78]

Hi,

I am writing a sed script to perform a task.

However, one of the lines I want to modify has 2 matches in the file.

How can I specify I only want to modify the second occurance?

 

[PHV]

Can you please post your current sed script ?

Hope This Helps, PH.
Want to get great answers to your Tek-Tips questions? Have a look at FAQ219-2884 or FAQ222-2244

 

[stu78]

Yes;

sed '/^RolloverSize=/s/0xa;/0x64;/' registry> tmp && mv tmp registry


The registy file has two enties;

RolloverSize= 0x64; REG_DWORD
TraceConfig= ; REG_SZ
RolloverSize= 0x64; REG_DWORD

I want to target the second instance only.

 

[PHV]

You may try something like this:
awk '
{b=$0}
/^RolloverSize/{++i;if(i==2)sub(/0xa;/,"0x64",b}
{print b}
' registry> tmp && mv tmp registry

Hope This Helps, PH.
Want to get great answers to your Tek-Tips questions? Have a look at FAQ219-2884 or FAQ222-2244

 

[stu78]

Can I not just use a line parameter within SED?

Like the g for global parameter?

 

[stu78]

HI PH.

This file does not work for me...

Any more suggestions?

 

[Ygor]

Try ...

awk '/^RolloverSize=/&&c++{sub("0xa;","0x64;")};1' registry> tmp && mv tmp registry

 

[PHV]

This file does not work for me
Can you please be more descriptive ?

Hope This Helps, PH.
Want to get great answers to your Tek-Tips questions? Have a look at FAQ219-2884 or FAQ222-2244

 

[stu78]

Hi PH,

THis is the error;

$ ./test.sh

awk: cmd. line:3: /^RolloverSize/{++i;if(i==2)sub(/0xa;/,"0x64",b}
awk: cmd. line:3: ^ syntax error

Stu

 

[PHV]

OK, you may try this:
awk '
{b=$0}
/^RolloverSize/{++i;if(i==2)sub("0xa;","0x64;",b)}
{print b}
' registry> tmp && mv tmp registry

Hope This Helps, PH.
Want to get great answers to your Tek-Tips questions? Have a look at FAQ219-2884 or FAQ222-2244