awk to reorder lines in output file - awk

Question

In the below awk I am printing out specific tags in the input. However, I can not seem to get line 2 in the current output to be line 1. It looks like because of the way the input is formatted that is why the output is ordered in the way it is. I can not seem to change it in the awk. Thank you :).
input
"barcodedSamples": {"MEV37": {"barcodeSampleInfo": {"IonXpress_007": {"controlSequenceType": "", "expName": "R_2016_09_20_12_47_36_user_S5-00580-7-Medexome",
awk
awk -F"[]\":{}, ]*" '
{for (i=1; i<NF; i++) {if ($i =="expName") print $(i+1)
if ($i =="barcodeSampleInfo") print $(i+1) " " $(i-1)
}
}
' input
current output
IonXpress_007 MEV37
R_2016_09_20_12_47_36_user_S5-00580-7-Medexome
desired output
R_2016_09_20_12_47_36_user_S5-00580-7-Medexome
IonXpress_007 MEV37

Answer 1

With jq :
INPUT FILE
{
"barcodedSamples" : {
"MEV37" : {
"barcodeSampleInfo" : {
"IonXpress_007" : {
"controlSequenceType" : "",
"expName" : "R_2016_09_20_12_47_36_user_S5-00580-7-Medexome"
}
}
}
}
}
COMMAND
% jq '.barcodedSamples.MEV37.barcodeSampleInfo.IonXpress_007.expName' file.json
OUTPUT
"R_2016_09_20_12_47_36_user_S5-00580-7-Medexome"
Or with nodejs :
% node
> j = { "barcodedSamples": {"MEV37": {"barcodeSampleInfo": {"IonXpress_007": {"controlSequenceType": "", "expName": "R_2016_09_20_12_47_36_user_S5-00580-7-Medexome"}}}}}
{ barcodedSamples: { MEV37: { barcodeSampleInfo: [Object] } } }
> console.log(j.barcodedSamples.MEV37.barcodeSampleInfo.IonXpress_007.expName)
R_2016_09_20_12_47_36_user_S5-00580-7-Medexome
NOTE
now that you understand how to access any part, just modify this a bit to fully fits your needs

Answer 2

You can create one or more arrays in the BEGIN function. When processing lines do not print. Instead of printing do append to these arrays in the order you want. In the END function print out these arrays.

Answer 3

awk -F\" '{print $(NF - 1)"\n" $8,$4}' file
R_2016_09_20_12_47_36_user_S5-00580-7-Medexome
IonXpress_007 MEV37