newb sed question

howarddevore · 07-06-2007, 11:52 AM

hello
I am trying to learn a bit about sed, and it is not behaving as I expected.
I have two files in a dir, old.txt and new.txt.
I cd to that dir, and have new.txt open in my text editor.

I wrote some junk text, with multiple instances of the word 'seems' and put it in both files.

The I ran sed:
sed s/seems/xxxx/ <old.txt>new.txt

It works - but only on the first instance of 'seems'.
I had been expecting it to replace all instances of it.

Can anyone give me a pointer please?

Thanks in advance.
Howard

0.o · 07-06-2007, 12:07 PM

Quote:

Originally Posted by howarddevore

hello
I am trying to learn a bit about sed, and it is not behaving as I expected.
I have two files in a dir, old.txt and new.txt.
I cd to that dir, and have new.txt open in my text editor.

I wrote some junk text, with multiple instances of the word 'seems' and put it in both files.

The I ran sed:
sed s/seems/xxxx/ <old.txt>new.txt

It works - but only on the first instance of 'seems'.
I had been expecting it to replace all instances of it.

Can anyone give me a pointer please?

Thanks in advance.
Howard

sed s/seems/xxxx/g <old.txt>new.txt

howarddevore · 07-06-2007, 12:26 PM

hello
I am trying to learn a bit about sed, and it is not behaving as I expected.
I have two files in a dir, old.txt and new.txt.
I cd to that dir, and have new.txt open in my text editor.

I wrote some junk text, with multiple instances of the word 'seems' and put it in both files.

The I ran sed:
sed s/seems/xxxx/ <old.txt>new.txt

It works - but only on the first instance of 'seems'.
I had been expecting it to replace all instances of it.

Can anyone give me a pointer please?

Thanks in advance.
Howard

ilikejam · 07-06-2007, 12:48 PM

Hi.

Try

Code:

sed 's/seems/xxxx/g' old.txt > new.txt

Dave

howarddevore · 07-06-2007, 01:49 PM

aha!

Thanks Dave.

dive · 07-06-2007, 02:50 PM

g = global