awk '{for (i=1 ;i<=NF;i++){ printf "\"" $i; if ( i==NF) {printf "\","} else {printf "\":"}}; printf "\n" }' awk_file.txt
cat awk_file.txt
100001 AAA
100002 AAB
100003 ACA
100004 AdA
100005 AeA
awk '{for (i=1 ;i<=NF;i++){ printf "\"" $i; if ( i==NF) {printf "\","} else {printf "\":"}}; printf "\n" }' awk_file.txt
"100001":"AAA",
"100002":"AAB",
"100003":"ACA",
"100004":"AdA",
"100005":"AeA",