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Thank you so much! All posts are really helpful, it works using read, grep, awk and nwak~ The 'grep value+space' is really smart, it solved so many problems~ Thank you guys again :)

I have a huge file and want to separate it into several subsets.
The file looks like:

C1 C2 C3 C4 ... (variable names)
1 ....
2 ....
3 ....
:
22 ....
23 ....

I want to separate...

Hi,

I want to combined 500 .txt files (each file only has one line) to a single txt file (A.txt).

for example,

A1.txt with
12
23
34
45

A2.txt with
56
67
78
89

...etc, so I...

Thank you so much rubin! This works perfect!!!

If I have a data test.txt with 1000 columns such as:

id sex gene1 gene2 gene2.dl gene3 gene4 gene4.dl .......
1 1 AA AT AT TT AT AT .......
2 1 AG ...

Thank you everyone! The codes are great and works!

To define the "different" numbers of columns in my dataset:

I know most of my rows in the dataset suppose to be N, but there are fews with N+2 or N+4, I want to find out which rows they are and...

I want to find the different column numbers among rows in a file. For example:

A001 a b c d e ... N
A002 a b c d e ... N
A003 a b c d e ... N+1
A004 a b c d e ... N
A005 a b c d e ... N+2
:...