Comparison

[stu78]

Hi,

How could I do a comparisoin between 2 files, and remove the data which is in file1 from file2?

Is this possible?

 

[johnherman]

Check out the diff command

-------------------------
The trouble with doing something right the first time is that noboby appreciates how difficult it was.
- Steven Wright

 

[vgersh99]

man comm

vlad
+----------------------------+
| #include<disclaimer.h> |
+----------------------------+

 

[xmb]

If the files aint 1:1 line-mapped, comm is not much of use.
Some awk:

{ if (NR == FNR) Seen[$0]; else if (! ($0 in Seen)) print }

. Mac for productivity
.. Linux for developement
... Windows for solitaire

 

[futurelet]

Here's another way of implementing xmb's algorithm:

NR==FNR { a[$0]; next }
!($0 in a)

Run it with
[tt]awk -f comp.awk file1 file2[/tt]