arron@arron-Ideapad-Z570 ~/Phd $ cat test_pph_s.csv | cut -f 1,2,3
#o_acc                   o_pos  o_aa1
ENSG00000145888            455      H
ENSG00000145888            450      R
ENSG00000145888            440      M
ENSG00000145888            428      R
ENSG00000145888            428      R

arron@arron-Ideapad-Z570 ~/Phd $ cat test_pph_s.csv | cut -f 1,2,3 | tr "\t" ","
#o_acc               , o_pos,o_aa1
ENSG00000145888     ,   455,    H
ENSG00000145888     ,   450,    R
ENSG00000145888     ,   440,    M
ENSG00000145888     ,   428,    R
ENSG00000145888     ,   428,    R

arron@arron-Ideapad-Z570 ~/Phd $ cat test_pph_s.csv | cut -f 1,2,3 | tr "\t" ","

#o_acc,o_pos,o_aa1
    ENSG00000145888,455,H
    ENSG00000145888,450,R
    ENSG00000145888,440,M
    ENSG00000145888,428,R
    ENSG00000145888,428,R