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for example if the number id for string B752 is 001. The code will replace B752 in
the file with the 001.

output for first row and its linked row will be as following

001 B295 B289
X216 001...

Hello,

I have a file with a 1000 ids in the form of strings. I want to replace each id with a unique numbers in the whole file. each id is repeating in all the columns. I know I can use sed...

Hello,

Thanks, but please tell me where I will put my column names which I want to select.

Hello,

I have a huge file with many columns . I want to use the names of the columns to print columns to another file.

for example

file.txt
COLA COLB COLC COLD
1 2 3 ...

Hello,

I have a huge file which contain space separated columns. I want to add a tab after every two columns in the file.

for example


input
A B C D E F G H
A B C D E F G H


output
...

I am using linux.

Hello,

I want to choose random columns from big file.

for example: My file contain around 21000 columns and I want to randomly extract 4000 columns from this file.

Anybody has a solution...

Hi Ygemici,

Thanks for the code but please explain what does 2 means. Are they number of rows?

thanks

Hello,

I have a huge tab delimited file with around 40,000 columns and 900 rows I want to convert columns to a row.

INPUT file look like this.
the first line is a headed of a file.

ID ...

Hey, It is displaying required rows correctly but displaying all the column from file. Not the one which are mentioned in the code

cut -c3-68 this option is only displaying characters of the column not the column from 3 to 68

yes from row 1

Hello,

I want to extract several columns and rows from a huge tab delimited file

for example: I want to print from from column 3 to 68 till row number 30.

I have tried using cut command but...

I have written this code but its displaying the ids more than once and its not exactly matching id of file1 with file2.

open (MYFILE, "file1.txt");
my @extract;
while ($record = <MYFILE>) {...

I tired it but i wanted the it wasn't displaying results according to file1 id order. anyways thanks! :)

---------- Post updated at 08:38 AM ---------- Previous update was at 08:37 AM ----------
...

Hello,

I want to extract columns from file2 to file3 by matching ids between file1 and file2. The extracted columns should be in same order as file1 ids.

for example:

file1.txt
1823
607...