P2S is a small utility program to convert formats from plink to sumstat and vice versa.The plink program uses the LINKAGE input format, which is a widely used format in genetic linkage and association analysis. The sumstat suite of programs has been developed using a different input format. Specifically, it lists each SNP on a separate input line (row) rather than an input column.
PLINK is a comprehensive toolset for statistical analysis in whole-genome association studies, designed to perform a range of basic, large-scale analyses in a computationally efficient manner.