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I guess today is my error day!!!
awk 'NR==FNR { F[$1]=1; next } !F[$1]' file2 file1
F[: Event not found.

---------- Post updated at 12:26 PM ---------- Previous update was at 12:24 PM ----------...

The following error occurs:
syntax error at line 7: `done' unexpected

---------- Post updated at 12:15 PM ---------- Previous update was at 12:14 PM ----------



This error occurs:
grep:...

I need to find the difference between two files in UNIX. I tried diff, but couldn't get it right.

There are two files:

file1: apple
mango
strawberry
banana
...

I mean, you have just used underscores, which is not clear to me.
[I am beginner in UNIX]

radoulov, thanks for your reply. But unfortunately, I don't get it. Can you make it a more detail please?

I have a large file like this:

8801 sdfsdcsdc
8801 gbfgfbfgb
8801 awdawdawd
8801 lolollbny
8803 fnauinawuile
8807 zzzzvcjmc
8807 vmkmnmdguibvn
8815 sdnjsndcvn
8815 wenfunefuni
8815...