How to multiply AWK output - bash

Question

I have a file data.csv with multiple lines that reads:
A
B
C
and I want the output of the code to be multiplied n times:
A
B
C
A
B
C
Here is an example of a line I've been trying and what it returns:
awk '{for (i=0; i<3 ;i++){ print $1}}' input.csv
A
A
A
B
B
B
C
C
C
Same with cat and other tools

Answer 1

$ awk -v n=3 'BEGIN{ for (i=1;i<n;i++) {ARGV[ARGC]=ARGV[1]; ARGC++} } 1' file
A
B
C
A
B
C
A
B
C
Note that the above only stores the name of the file n times, not the contents of the file and so it'd work for any file of any size as it uses negligible memory.

Answer 2

This would do:
for i in {1..3}; do cat data.csv; done
It won't work with pipes, though.
Thanks for the comments

Answer 3

You can use cat and printf
cat $(printf "%0.sfile " {1..3})

Answer 4

Here is a single efficient 1-liner: yes data | head -3 | xargs cat
$ cat data
A
B
C
$ yes data | head -3 | xargs cat
A
B
C
A
B
C
A
B
C
$
head -3 => here 3 indicates n number of times.
Or using an awk solution:
$ cat data
A
B
C
$ awk 'BEGIN{i=0} {a[i]=$0;i++} END {for(i=0;i<=3;i++) for(j=0;j<=NR;j++) print a[j]}' data | sed '/^$/d'
A
B
C
A
B
C
A
B
C
A
B
C
$

Answer 5

Try this :
seq 2 | xargs -Inone cat input.csv

Answer 6

probably the shortest
cat input.csv{,,}

Answer 7

Supposing you're writing a shell-script, why use awk?
for i in `seq 3`; do
cat data.csv
done
If you want to do this using pipes, e.g. with awk, you'll need to store the file data in memory or save it temporarily to disk. For example:
cat data.csv | \
awk '{a = a $0 "\n"} END { for (i=0; i<3 ;i++){ printf "%s",a; }}'

Answer 8

for (( c=1; c<=3; c++ ))
do
cat Input_file.csv
done

Answer 9

With sed and hold/pattern space:
In this given situation with only single letters. Respectively ABC:
If you want to print once:
cat temp | sed 's/\(.*\)/\1/;N;N;H'
output:
[anthony#aguevara ~]$ cat temp | sed 's/\(.*\)/\1/;N;N;H;G;G'
A
B
C
[anthony#aguevara ~]$
Twice(Just append a semi-colon/capital G tot he end):
cat temp | sed 's/\(.*\)/\1/;N;N;H;G'
output:
[anthony#aguevara ~]$ cat temp | sed 's/\(.*\)/\1/;N;N;H;G;G'
A
B
C
A
B
C
[anthony#aguevara ~]$
Three times(Another G):
cat temp | sed 's/\(.*\)/\1/;N;N;H;G;G'
output:
[anthony#aguevara ~]$ cat temp | sed 's/\(.*\)/\1/;N;N;H;G;G'
A
B
C
A
B
C
A
B
C
[anthony#aguevara ~]$
and so on.
File(Has no newlines in file):
[anthony#aguevara ~]$ cat temp
A
B
C
[anthony#aguevara ~]$