Merge two non-consecutive lines

Shell Programming and Scripting
1

Hello - First post here. I need help combining two lines that are non-consecutive in a file. Using sed, awk or perl preferably. So the file looks as follows. Please note, the "Line#:" is there only for reference. The lines can only be distinguished by whether they have "start" or "done" in the file name.

Line01:  field1,field2,field3,field4,fieldstart 
Line02:  field1,field2,field3,field4,fieldstart 
Line03:  field1,field2,field3,field4,fieldstart 
Line04:  field1,field2,field3,field4,fieldstart 
Line05:  field1,field2,field3,field4,fieldstart 
Line06:  field1,field2,field3,field4,fielddone
Line07:  field1,field2,field3,field4,fielddone
Line08:  field1,field2,field3,field4,fielddone
Line09:  field1,field2,field3,field4,fielddone
Line10:  field1,field2,field3,field4,fielddone

So after combining, I need the file to look as follows:

field1,field2,field3,field4,fieldstart,field1,field2,field3,field4,fielddone
field1,field2,field3,field4,fieldstart,field1,field2,field3,field4,fielddone
field1,field2,field3,field4,fieldstart,field1,field2,field3,field4,fielddone
field1,field2,field3,field4,fieldstart,field1,field2,field3,field4,fielddone
field1,field2,field3,field4,fieldstart,field1,field2,field3,field4,fielddone

So the pattern I'm looking for here for the lines is

Line01,Line06
Line02,Line07
Line03,Line08
Line04,Line09
Line05,Line10

Thanks for any help.

2

Try:

awk '{a[(NR-1)%5]=a[(NR-1)%5]","$0}END{for (i=0;i<NR/2;i++){sub ("^,","",a);print a}}' file
1 Like
3

Worked perfectly. Thanks!