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Thanks a lot!! :):)

Hi, everyone,
I have a matrix, let's say:

1 2 3 4 5 6 ...
4 5 6 7 8 9 ...
7 8 9 1 2 3 ...
3 4 5 6 7 8 ...
.........
(nxm matrix)

Is there a simple command that can take certain...

Ok, I'm a super Rookie.
I put
nawk 'FNR==NR {a[$0]++; next} !a[$0]' xxx.txt yyy.txt
in a txt file call 'awk.txt'
Then I use
> sh awk.txt
awk.txt: line 1: nawk: command not found

I...

There is only gawk here. No nawk. Are they the same??
thanks.

PS: gawk ... doesn't work for me...

Hi, everyone,
Let's say, we have
xxx.txt
A 1 2 3 4 5
C 1 2 3 4 5
E 1 2 3 4 5

yyy.txt
A 1 2 3 4 5
B 1 2 3 4 5
C 1 2 3 4 5
D 1 2 3 4 5
E 1 2 3 4 5

First I match the first column...

Thanks a lot.

I really appreciate your help!
However, the file is from human genome sequencing (>1G, too large).
I found some other way to do it. Not with Unix. But in R. Although not so efficient.
Anyway,...

THanks so much too!!

Thanks so much!!

let's say, we have:
x1.txt
1 2
3 4
5 6

x2.txt
7 8
9 10
11 12

is there a very simple command like 'cat' that can makes them combine into x3.txt :
1 2 7 8
3 4 9 10
5 6 11 12
Thanks...

Yes I tried : grep "A/C " xxx.txt | more (with a space)
still nothing showed up!! Really sucks, why it didn't work on my computer! Gonna figure it out... maybe because of the format of the...

I have tried, but failed to work. nothing show up after I put in a space after A/C.
I guess "/" is considered a 'space'...
That's also why I'm asking if I could set the delimiter by myself...

totally pis*ed off.
I have a data set (xxx.txt), as follows:

chr1 3821 rs127372 A/C 0.823
chr1 3822 rs127376 A/C/G 0.899
chr1 3722 rs612634 A/C 9.22
chr1 3262 rs7152 ...

Yes, you are absolutely right. Thanks!
i just wonder, what does 777 means here??

what if their files names are all different, like x, y,z but I need to use the same command 'mv' for 20 times on 20 different files?? thanks!!

I need a command, which could run mutliple commands from a file.
Let's say, I have
mv fileA1 fileB1
mv fileA2 fileB2
.....
mv fileA20 fileB20
I put these commands in a file, then I need a...

Thanks a lot, too!!

Thanks a lot! Really a easy way!

I have a file:

chromosome1:436728
chromosome2:32892
.....
chromosome22:23781

I just want to get the number, not the prefix "chromosomeX", so I want to remove all the prefix ahead of the...

really appreciate :):):)

one more dummy question, what if I want to keep column 1 and column 3, but remove column 2 and column 4?? I mean, can I still use cut -f ?? ( or i need to use awk, which I don't really...

thanks !!! :-)))))))))

I have a file which contains 6 columns.
But I only need the first 3 columns. So I need to remove the last 3 columns. I checked 'cut' but it seems not working.
So is there a command that could...

so nice of you!! save my ass :D:D

I am trying to use 'cut' to get a line from my file. But it seems that 'cut' recongnizes TAB as default. My file uses space instead. So 'cut' doesn't work.
Anybody can tell me how to change the...