replace path
 

hi guys
i have a simple question

i have some variables they contain path addresses i want to replace old address with new address

e.g

echo $m=/tmp/files3/New/test

i want to replace /tmp/files3 with /root/new

i used sed but it didnt work

echo $m | sed "s-/tmp/files3-/root/new"

what ca i do ???

export m='/tmp/files3'

Where do you want to replace them? In a script, your environment just for this session, in your environment permanently? Where are the original values stored?

what's this ???
???????????!!!!!!!!

What is that?:)

whoop my bad, i don't know what i was thinking.

here:

echo $m | sed 's/tmp\/files3/root\/new/'

Well, if anything, it'll be:

but without knowing the context, I still fail to see the point of doing all of that.

There's no need for sed. Once a value is in a variable, you really only need built-in parameter substitution.

The second one is a more portable version (the "${var/match/replace}" pattern is only available in bash and some other modern shells), but it assumes that the string to replace is at the front of the variable.


Bash also has many more string manipulation options available, and you should generally rely on them for simple operations like this. Save the external tools like sed and awk for operating on text files and other large blocks of text that need to be processed en masse.