find text but replace a text beside it

Shell Programming and Scripting
1

I have an html file that looks like this (this is just a part of the html file):

<td colspan="3" rowspan="1" style="text-align: center; background-color: rgb(<!-- IDENTIFIER1 -->51, 255, 51);"><small><!-- IDENTIFIER2 -->UP</small></td>

This is to automatically update the status of the environment:

  1. Find the IDENTIFIER1.
  2. Replace 51, 255, 51 with some number (e.g, 0, 0, 0)
  3. Find IDENTIFIER 2.
  4. Replace UP or DOWN with a some value (e.g, UP or DOWN as well)

I know i can us a simple find and replace substitution using SED but it will
be a very long line of code and can be mixed up with all the characters on the line so I though of using the above logic but i dont know how to do it. Appreciate your help.

2

I'm not sure if you are saying you are already using this, and would like to avoid it, but then I don't really see what would be much simpler than this.

sed -e 's/\(<!-- IDENTIFIER1 -->\)[0-9]*,[0-9]*,[0-9]*/\10,0,0/' \
  -e 's/\(<!-- IDENTIFIER2 -->\)UP/\1DOWN/' old.html >new.html

If the replacement values should not be hardcoded, you need to adjust the quoting; single quotes prevent variable expansion, but you can mix single and double quotes freely to protect the parts which need protection and still get variable interpolation where you want it.

3

Thanks a lot! That saves time.

That works for the character substitution but didnt work for the number substitutions:
sed -e 's/\(<!-- IDENTIFIER1 -->\)[0-9]*,[0-9]*,[0-9]*/\10,0,0/'

4

Looks like you need to add spaces after the commas, sorry for missing that.

5

yep :), the space was missed.. thanks for the help :slight_smile: