1

I am trying to replace a string with sed (stream editor), however I am getting errors thrown back. Probably because I am not using the string correctly, because of the symbols.

I am trying to replace the following string:

<VirtualHost |IP|:|PORT_80| |MULTI_IP|> 

with

<VirtualHost 127.0.0.1:8080 |IP|:8080 |MULTI_IP|>

In the file called virtual_host2.conf

Buw when I try several things, I always get errors back like:

sed: -e expression #1, char 90: unterminated `s' command
sed: -e expression #1, char 20: unknown option to `s'

I am not that experienced with sed, but I can replace text strings normally. But I think because of the symbols in the current string, like |, < and > it doesn't work like I would.

Can someone please give me a working example on how to replace the above? Or point me in the right direction.

I tried the following myself:

sed -i 's<VirtualHost |IP|:|PORT_80| |MULTI_IP|>/<VirtualHost 127.0.0.1:8080 |IP|:8080 |MULTI_IP|>' /virtual_host2.conf

sed -i 's|<VirtualHost |IP|:|PORT_80| |MULTI_IP|>|<VirtualHost 127.0.0.1:8080 |IP|:8080 |MULTI_IP|>|g' /virtual_host2.conf

But both give the error as mentioned above.

Any idea?

2

You omit / in sed 's///' pattern. Try this:

sed 's/<VirtualHost |IP|:|PORT_80| |MULTI_IP|>/<VirtualHost 127.0.0.1:8080 |IP|:8080 |MULTI_IP|>/' /virtual_host2.conf

And if everything is ok, add -i option to execut real replacement in file.

g option in 's///g' pattern perform global replacement of all occurances, not the first in each line.


You can use some other symbols as delimeter, such as 's|||', but it not make sense in your example because you need to quote each | symbol. This command will get the same output:

sed 's|<VirtualHost \|IP\|:\|PORT_80\| \|MULTI_IP\|>|<VirtualHost 127.0.0.1:8080 \|IP\|:8080 \|MULTI_IP\|>|' /virtual_host2.conf
  • Thank you for your help and details. I didn't even know if I used sed without "i" that it would show the changes. Thank you kindly. Learned a new thing today. – Restafval Oct 24 '17 at 7:47
  • @Restafval, great! See this tutorial for more tricks with sed: grymoire.com/Unix/Sed.html – Egor Vasilyev Oct 24 '17 at 7:51

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.