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Help with concatenate multiple line into one line

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# 1  
Help with concatenate multiple line into one line


Do anybody experience how to concatenate multiple line into one line by using awk or perl command?

Input file:

From the above Input file, it got 5 lines

Desired output file:

I hope to concatenate all the line exclude ">" into a line.
It means at the desired output file, it only can contain 2 line. First line is a line with ">" and another line is concatenate multiple line into one long single line.

Thanks for any advice.
# 2  
An awk:
awk '{ORS=/^>/?"\n":"";print}' infile

If you have a multiple set file (and adding last rc as @RudiC proposes):
awk '{ORS=sub(/^>/,"\n>")?"\n":"";print}END{print "\n"}' infile

Last edited by Klashxx; 05-12-2014 at 12:52 PM..
# 3  
To make that a correct *nix text file by adding a new line char at the end, try:
awk '{ORS=/^>/?"\n":"";print} END{printf "\n"}' file

# 4  
Try deleting the new line with tr:-
tr -d "\n" < infile > outfile

It works for me, but of course there is no new-line at the end, so:-
RBATTE1> cat outfile

# 5  
Another approach:
awk '
        />/ {
                $0 = ( NR == 1 ? $0 : RS $0 RS )
        !/>/ {
                ORS = ""
        END {
                print "\n"
' file

# 6  
Nice & clean @Yoda , just one point i .. i would use next to avoid the second matching this way:
awk '
        />/ {
                $0 = ( NR == 1 ? $0 : RS $0 RS )
                ORS = ""
        END {
                print "\n"
' infile

This User Gave Thanks to Klashxx For This Post:
# 7  
Another one:
awk '{$1=RS $1 ORS}NR>1' OFS= RS=\> file

(As long as there are no extra ">" in the ">" headers..)

awk '/^>/{if(NR>1)print RS; $1=$1 RS}1 END{print RS}' ORS= file

Last edited by Scrutinizer; 05-12-2014 at 03:19 PM..

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