dnanar@debian:/tmp$ cat a | grep azerty| cut -d ' ' -f2
a
b
c
d
e
f
dnanar@debian:/tmp$ cat a | grep qwerty| cut -d ' ' -f2
g
h
i
j
k
l

#### And i would produce a file like that:
a g
b h
c i
d j
e k
f l