awk将输出打印为变量/数组，未保持格式

Question

My aim is to take the output from an awk print command (while keeping the formatting) and use that to replace certain text in a file.
Currently im using:

declare -a mach=($(awk -F',' 'NR>1{print NR-1, $8}' mag_grad.csv)) 

which gives:

1 0.77492
2 0.18022
3 0.29596
4 0.5229

etc...

I'm trying to use sed to find and replace text in a file with the array $mach, with the same formatting of 2 columns.

sed -i s/"mach data"/"${mach[*]}"/g nodedata.txt

However the result of this is to replace mach data with

1 0.77492 2 0.18022 3 0.29596 4 0.5229 .......

Any ideas on how I could preserve the formatting?

Cheers

Answer 1

try:

mach=$(awk -F',' 'NR>1{print NR-1, $8}' mag_grad.csv)
sed -i "s/\x22mach data\x22/${mach//$'\n'/\\n}/" nodedata.txt