Merge columns

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# 1  
Old 08-25-2011
Merge columns

Hi all - I have a file like below:

A: A1,A2,A3,A4
B: 1,2,3,4
C: z,y,x,w


This format repeats

The output should come in a single line merging the first line field with the other two rows:

A1_1 A1_z A2_2 A2_y A3_3 A3_x A4_4 A4_w

Could anyone help with some directions

# 2  
Old 08-25-2011
cut -d' ' -f2 INPUTFILE | awk -F, '
NR % 3 == 1 { for (i=1; i<=NF; i++) a[i] = $i }
NR % 3 == 2 { for (i=1; i<=NF; i++) b[i] = $i }
NR % 3 == 0 { 
  for (i=1; i<=NF; i++)
    printf a[i] "_" b[i] " " a[i] "_" $i " "
  print ""
A1_1 A1_z A2_2 A2_y A3_3 A3_x A4_4 A4_w

This User Gave Thanks to yazu For This Post:
# 3  
Old 08-25-2011
Many thanks.. I guess I can workout the other bits myself Smilie

Great stuff! Could you please explain what the NR % 3 ... lines do?
# 4  
Old 08-25-2011
They separate n+1, n+2, n+3 lines in files. % is modulus operator, n%m gives numbers from 0 to m-1 in a circle - from 0 to 2 here. For example "NR % 3 == 1" means every first, forth, seventh and so on lines, etc.
# 5  
Old 08-25-2011
Super! Got it. Thanks
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