Joins two blocks of text, such that row 1 of the first block will be appended to row 1 of the second block and so on.
Input is read from stdin until EOF, output to stdout. The the first half of the input lines will become the first block.
cargo install joinlines
# cat f.txt
1
2
3
a
b
c
# joinlines ',' < f.txt
1,a
2,b
3,c
make test
- Support ignoring lines starting with a prefix