need help: text replacement with sed

[amit4g]

I've a file which looks something like this:

<snip from packetLog.c>
printf("\ntxPackets=0x%x\n",txPackets);
printf("\ntxPacketsOut=0x%x\n",txPacketsOut);
printf("\ntxBytes=0x%x\n",txBytes);
printf("\nOutwardtxBytes=0x%x\n",OutwardtxBytes);
<snip from packetLog.c>

Now i want to replace all such parameters i.e. txPackets, txPacketsOut, txBytes, OutwardtxBytes) etc to be renamed as
txPacketsP1,txPacketsOutP1, txBytesP1, OutwardtxBytesP1 respectively. so i wrote a shell script using sed as

#!/bin/bash
sed -i s/txPackets/txPacketsP1/g packetLog.c
sed -i s/txPacketsOut/txPacketsOutP1/g packetLog.c
sed -i s/txBytes/txBytesP1/g packetLog.c
sed -i s/OutwardtxBytes/OutwardtxBytesP1/g packetLog.c

seemed simple but it doesn't work, now packetLog.c becomes:

printf("\ntxPacketsP1=0x%x\n",txPacketsP1);
printf("\ntxPacketsP1Out=0x%x\n",txPacketsP1Out); <-- required is txPacketsOutP1
printf("\ntxBytesP1=0x%x\n",txBytesP1);
printf("\nOutwardtxBytesP1P1=0x%x\n",OutwardtxBytesP1P1); <--- required is OutwardtxBytesP1

But this is not what I've wanted, Hence please let me know how should i go about doing this.

Regards,
-amit

[Cabhan]

So, the problem here is that "txPacketsOut" contains "txPackets". So when you do a replacement of every "txPackets", it replaces this text EVERYWHERE, not just when it is a whole "word".

So you want to use actually match "\btxPacketsOut\b", "\btxPackets\b", etc. "\b" is a word boundary. For example:

alex@niamh:~$ echo "foo" | sed -re 's/\bfoo\b/hello/'
hello
alex@niamh:~$ echo "foos" | sed -re 's/\bfoo\b/hello/'
foos

You can see that it gets replacd in the first instance (because the "foo" is a word), but not in the second.

[amit4g]

Thanks a ton Cabhan. It worked