replace url of favicon using sed command is not working

Question

I want to replace a URL present in an html file for the shortcut icon, using c. I use sed to replace the url but the command is giving an error as it can't read the icon even if the icon is present at the specified location.

If I manually replace the URL, it's working fine.

My command is:

sed -i '/<link id=/c\\<link id='test' rel='shortcut icon' href='path_of_icon' type='image/x-icon'/>' path_of_html_file

Answer 1

sed -i "s|<link id=|<link id='test' rel='shortcut icon' href='path_of_icon' type='image/x-icon'|" path_of_html_file

• You use only ' so shell mix content and interpretation
• you forget the first s for replacment order
• you use / as separtor of pattern but /is also in your pattern

Answer 2

If you want to use sed 'change' command to replace whole line containing "link id=..." then why not putting it into a script file and source via -f ? That would help with quoting issue (I believe your error is due to quoting, as already mentioned):

s.sed:

/<link id=/c\
<link id='test' rel='shortcut icon' href='path_of_icon' type='image/x-icon'/>

then

sed -i -f s.sed path_of_html_file

It's perfectly possible doing that on command line, but everything that deals with quotes inside other quotes can get pretty much ugly on a cmdline.