text file task

[ogniemi]

Hello,
I've a text file with similiar contents:

1
abc
2
abc
3
def
4
abc
5
def
6
abc
7
abc

Questions:
1. How to join each 2 lines (starting from top of hte file) to one line
2. How to print line containing def and one line before each of this line

I have no gnu grep in my system.


regards,
m.

 

[Ygor]

Try

1. paste -s -d" \n" file
2. paste -s -d" \n" file | grep def