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OK so I'm extremely new to bash shell scripting and I've been pretty successful up until this point. I'm using BASH to fix a problem...

I want to turn a basic domain name: Buddies.forlife.com into |07|Buddies|07|forlife|03|com

Basically, I need it to count the letters and convert it to hex. To be clear, Not convert the domain name to hex, but the letter count to hex. I'm having a hard time replacing the period "."

I hope you understand what I'm trying to achieve...

Thanks for the help in advance!

  • So you solved the counting, and want us to tell you how to replace the periods? – a CVn Jun 3 '16 at 14:11
  • Well Both if possible. I hand jammed those numbers in to demonstrate the outcome I'm looking for. – DrManhattan Jun 3 '16 at 15:11
  • Oh and the count is in hex so after the numbers... 0a, 0b.... u get the rest. – DrManhattan Jun 3 '16 at 15:14
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Here is a straightforward way to do this using awk

echo "Buddies.forlife.com" | awk -F '.' '{ printf( "|0x%x|%s|0x%x|%s|0x%x|%s\n", length($1),$1, length($2),$2, length ($3), $3 )}'
|0x7|Buddies|0x7|forlife|0x3|com

The awk command is setting the field separator -F '.' to a period, so each segment is considered it's own field.

We can then refer to those fields by $1, $2 and $3, use the builtin function length to get the character count for each field, and use a printf to print out the results (%x for hex numbers, %s for the original strings, and output field separation using the '|' symbol, in the format you had specified.

The 0xprefix is typically used to indicate hex numbers, but can be changed to something else (or nothing) as needed.

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