add header to strings by using the string itself

Question

I want to add a header t my input strings. The header should be > directly followed by the string and the number after the string separated with a _ To add a header I used this awk '{print ">"$0;print}' However I dont kno how to add the number behind.

input:

CTTCTATGATGAATTTGATTGCATTGATCGTCTGACATGATAATGTATTT  2
AGAACGAAAGTCGGAGGTTCGAAGACGATC   14
TACCCTGTAGAACCGAANTTGT   1
TCCCTGTGGTCTAGTGGTTAGGATTCTGCGCTCTCACCGCCGCGGCCCGGG     2
GGGCCAGGATGAAACCTAATTTGAGTGGCCATCCATGGATGAGAAATGCGG 4
TAATACGGCCGGGTAATGATGGA 0
CCAGATGATGAACTTATTGACGGGCGGACAGAAACTGTGTGCTGATTGTCA 7240
CGCCCGATCTCGTCTGATCTCG  34
GCAGGGGTGGTTCAGTGGTAGAATTCTCGCC 3

output:

>CTTCTATGATGAATTTGATTGCATTGATCGTCTGACATGATAATGTATTT_2
 CTTCTATGATGAATTTGATTGCATTGATCGTCTGACATGATAATGTATTT
>AGAACGAAAGTCGGAGGTTCGAAGACGATC_14
 AGAACGAAAGTCGGAGGTTCGAAGACGATC
....

John1024 · Accepted Answer · 2015-09-21 21:40:37Z

$ awk '{printf ">%s_%s\n %s\n",$1,$2,$1;}' file
>CTTCTATGATGAATTTGATTGCATTGATCGTCTGACATGATAATGTATTT_2
 CTTCTATGATGAATTTGATTGCATTGATCGTCTGACATGATAATGTATTT
>AGAACGAAAGTCGGAGGTTCGAAGACGATC_14
 AGAACGAAAGTCGGAGGTTCGAAGACGATC
>TACCCTGTAGAACCGAANTTGT_1
 TACCCTGTAGAACCGAANTTGT
>TCCCTGTGGTCTAGTGGTTAGGATTCTGCGCTCTCACCGCCGCGGCCCGGG_2
 TCCCTGTGGTCTAGTGGTTAGGATTCTGCGCTCTCACCGCCGCGGCCCGGG
>GGGCCAGGATGAAACCTAATTTGAGTGGCCATCCATGGATGAGAAATGCGG_4
 GGGCCAGGATGAAACCTAATTTGAGTGGCCATCCATGGATGAGAAATGCGG
>TAATACGGCCGGGTAATGATGGA_0
 TAATACGGCCGGGTAATGATGGA
>CCAGATGATGAACTTATTGACGGGCGGACAGAAACTGTGTGCTGATTGTCA_7240
 CCAGATGATGAACTTATTGACGGGCGGACAGAAACTGTGTGCTGATTGTCA
>CGCCCGATCTCGTCTGATCTCG_34
 CGCCCGATCTCGTCTGATCTCG
>GCAGGGGTGGTTCAGTGGTAGAATTCTCGCC_3
 GCAGGGGTGGTTCAGTGGTAGAATTCTCGCC

How it works

The awk script consists of a single command:

printf ">%s_%s\n %s\n",$1,$2,$1

By default, awk splits up input lines into fields based on white space. So, For the first line for example, field 1 is CTTCTATGATGAATTTGATTGCATTGATCGTCTGACATGATAATGTATTT and field 2 is 2. The printf allows us to rearrange the input into the desired format. For each input line, two lines are written. The first one, with format >%s_%s\n writes > followed by field 1 followed by _ followed by field 2 followed by a newline character. The format for the second output line is%s\n which outputs a space followed by field one followed by a newline character.

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