Shell Programming and Scripting

Hi all,

I have two .txt file i.e.

First text file:

Code:

2
4
1
4

Second text file

Code:

2 1.nii.gz
4 334.nii.gz
1 12.nii.gz
4 134.nii.gz

If entry in 1st column of 1st text file matches the 1st column of 2nd text file, then copy the file (name of which is the second column) associated with the first column into a separate folder.

Thank you (and no, I this is not a homework question, it's a stupid work around to avoid doing a lot of manual cp and paste with files for many subjects. I am not a programmer).

You have the same number (4) twice in the first column. Mistake? Can a number be twice? Or, do the two files line up line-by-line?

Thank you! it's a mistake. First column is the subject ID and they are all unique. Second column, however, does have repetitions.

Code:

$ cat sample6.txt
2 1.nii.gz
4 334.nii.gz
1 12.nii.gz
5 134.nii.gz

$ cat sample6in.txt
4
2

$ cat sample6in.txt | sed 's/^/^/' >sample6in.txt2

$ grep -f sample6in.txt2 sample6.txt
2 1.nii.gz
4 334.nii.gz

$ grep -f sample6in.txt2 sample6.txt | awk '{print $2}'
1.nii.gz
334.nii.gz

So I think you can have duplicated recored in 1st test file, if they are one-to-one related.

Code:

awk '{getline s < "file1"} s==$1' file2

2 1.nii.gz
4 334.nii.gz
1 12.nii.gz
4 134.nii.gz