Globally replacing a string

Question

I would like to use the global command 'g' to replace a string, e.g. replace hello with world I execute the command: s/hello/world/g I used this command before in nvi (now I only have vi) and it worked. This time however, the command executes only on the words on one line, not throughout the file.

I am using t shell.

Thank you.

Answer 1

In regular vi, you need to prefix the command with % to operate on every line:

:%s/hello/world/g

Note that % is equivalent to the explicit range 1,$ in SteveP's answer, in case you wondered what the difference is.

Answer 2

In vi you could precede the command with a % to make the search and replace take place over the entire file.

%s/hello/world/g

Use with caution obviously :)