unix - AWK or SED to remove pattern from every line while using grep -

i have grep 2 columns , suppose col1 , col2. in col2 want remove pattern occurs in every line. how use awk/sed purpose?

suppose ps -eaf | grep b result following output:

col1 col2       col3 1    a/b/rac     123 2    a/b/rac1    456 3    a/b/rac3    789

i want output stored in file :

1 rac 2 rac1 3 rac3

vaguely speaking, might want:

$ awk 'sub(/.*b\//,"",$2){print $1, $2}' file  1 rac 2 rac1 3 rac3

assuming file contains:

col1 col2       col3 1    a/b/rac     123 2    a/b/rac1    456 3    a/b/rac3    789

O9