Converting Unicode point to character with awk

unicode2char.sh

awk '/U/ && /kMandarin/{split($1,uc,"+"); printf "%s;%s;%s\n",$1,system("/usr/bin/printf \"%b\n\" \"\\u" uc[2] "\""),$3 }' ./unihan/Unihan/Unihan_Readings.txt | head
㐀
U+3400;0;qiū
㐁
U+3401;0;tiàn
㐄
U+3404;0;kuà
㐅
U+3405;0;wǔ
㐆
U+3406;0;yǐn

unihan_reading.sh

awk  '/U/ && /kMandarin/ {print $0}' ./resources/unihan/Unihan/Unihan_Readings.txt | head
U+3400  kMandarin       qiū
U+3401  kMandarin       tiàn
U+3404  kMandarin       kuà
U+3405  kMandarin       wǔ
U+3406  kMandarin       yǐn
U+340C  kMandarin       yí
U+3416  kMandarin       xié
U+341C  kMandarin       chóu
U+3421  kMandarin       nuò
U+3424  kMandarin       dān

I end up using bash as it's simplier as recommended by geirha on #awk:

while read -r a b c; do if [[ $a = U+* && $b = kMandarin ]]; then printf '%s;%b;%s\n' "$a" "\\u${a#U+}" "$c"; fi; done < ./unihan/Unihan/Unihan_Readings.txt