Question

I have 2 files like these:

file1

1 2 3 . . .

1 -2 4 . . .

1 2 5 . . .

. . . . . .

. . . . .

file 2

1 0.33 3 . . .

2 0.14 4 . . .

3 2.155 5 . . .

. . . . . .

. . . . . .

I need to check line by line the condition ($1==1 && $2==-2) in file1 and modify the corresponding line in file2, with $3=-2

I am trying with:

awk -F '\t' '{ BEGIN { FS=OFS="\t" } if ($1==1 && ($2==-2) {getline < "file2" ; $3=8; print $0} else {getline < "file2" ; print $0}  }' file1

So that the output file should be:

1 0.33 3 . . .

2 0.14 8 . . .

3 2.155 5 . . .

. . . . . .

. . . . . .

but it seems like some character or space is modified.
Maybe with Python it is simpler to tackle this problem?
Any suggestion?

Answer 1

Since you asked about python

#!/usr/bin/env python

with open('f1') as  fd:
    f1 = [map(int,i.strip().split()) for i in fd]
with open('f2') as  fd:
    f2 = [map(float,i.strip().split()) for i in fd]

for n, f in enumerate(f2):
    if f1[n][0] == 1 and f1[n][1] == -2:
        print f[0], f[1], 8
    else:
        print f