如何串联两行上指定的标识符？

Question

Input where identifier specified by two rows 1-2

L1_I                L1_I                C-14               <---|  unique idenfier 
WWPTH               WWPT                WWPTH              <---|  on two rows
1                   2                   3

Goal: how to concatenate the rows?

L1_IWWPTH           L1_IWWPT            C-14WWPTH          <--- unique identifier
1                   2                   3

Ps I will accept the simplest and most elegant solution.

Answer 1

Assuming that the input is in a file called file :

$ awk 'NR==1{for (i=1;i<=NF;i++) a[i]=$i;next} NR==2{for (i=1;i<=NF;i++) printf "%-20s",a[i] $i;print"";next} 1' file
L1_IWWPTH           L1_IWWPT            C-14WWPTH           
1                   2                   3

How it works

• NR==1{for (i=1;i<=NF;i++) a[i]=$i;next}

  For the first line, save all the column headings in the array a . Then, skip over the rest of the commands and jump to the next line.

• NR==2{for (i=1;i<=NF;i++) printf "%-20s",a[i] $i;print"";next}

  For the second line, print all the column headings, merging together the ones from the first and second rows. Then, skip over the rest of the commands and jump to the next line.

• 1

  1 is awk's cryptic shorthand for print the line as is. This is done for all lines after the seconds.

Tab-separated columns with possible missing columns

If columns are tab-separated:

awk -F'\t' 'NR==1{for (i=1;i<=NF;i++) a[i]=$i;next} NR==2{for (i=1;i<=NF;i++) printf "%s\t",a[i] $i;print"";next} 1' file

Answer 2

If you plan to use python, you can use zip in the following way:

input = [['L1_I', 'L1_I', 'C-14'], ['WWPTH','WWPT','WWPTH'],[1,2,3]]
output = [[i+j for i,j in  zip(input[0],input[1])]] + input[2:]
print output

output:

[['L1_IWWPTH', 'L1_IWWPT', 'C-14WWPTH'], [1, 2, 3]]

Answer 3

#!/usr/bin/awk -f NR == 1 { split($0, a) next } NR == 2 { for (b in a) printf "%-20s", a[b] $b print "" next } 1