Sed problem

Miro1 · 04-09-2005, 05:13 AM

In my hand made makefile, I am trying to find/update config.h source to save $prefix value into the line like '#define INSTALL_PREFIX "$prefix" ' (replace $prefix with actual value here)

My makefile looks like this:

prefix=/usr

all: updatesrc

updatesrc:
sed -i 's_\#define INSTALL_PREFIX .*_\#define INSTALL_PREFIX "$(prefix)"\r_' ./config.h

Problem is this sed line reports errors, probably due to $prefix value having slash characters inside.

How can I fix this ? Any ideas?

TIA,
Miro

jschiwal · 04-09-2005, 06:06 AM

You can use a different character other than a slash as a seperator. The octothorpe character is often used, however that would conflict with the ones used for '#define'. Whatever character you use for a seperator, if the same character appears in a pattern, It needs to be escaped.

However, in your example, you are using the underscore character as a seperator so you will need to escape the underscore used in 'INSTALL_PREFIX.

Miro1 · 04-09-2005, 07:27 AM

Thanks, I'll try this

Miro1 · 04-09-2005, 09:02 AM

I've just tested the code, it works great.

Thanks again.