#!/bin/bash
s='0,M,19,finnish,english swedish german
9,M,30,urdu,english
122,F,26,finnish,english swedish german
83,M,20,finnish,english french swedish
44,F,20,finnish,english swedish
10,F,29,finnish,english'
awk -F\, '$1 < 99 && $1 > 10' <<< "$s"
echo "---"
grep -E '^(1[1-9]|[2-8][0-9]|9[0-8]),' <<< "$s"
IyEvYmluL2Jhc2gKcz0nMCxNLDE5LGZpbm5pc2gsZW5nbGlzaCBzd2VkaXNoIGdlcm1hbiAKOSxNLDMwLHVyZHUsZW5nbGlzaCAKMTIyLEYsMjYsZmlubmlzaCxlbmdsaXNoIHN3ZWRpc2ggZ2VybWFuCjgzLE0sMjAsZmlubmlzaCxlbmdsaXNoIGZyZW5jaCBzd2VkaXNoIAo0NCxGLDIwLGZpbm5pc2gsZW5nbGlzaCBzd2VkaXNoIAoxMCxGLDI5LGZpbm5pc2gsZW5nbGlzaCcKYXdrIC1GXCwgJyQxIDwgOTkgJiYgJDEgPiAxMCcgPDw8ICIkcyIKZWNobyAiLS0tIgpncmVwIC1FICdeKDFbMS05XXxbMi04XVswLTldfDlbMC04XSksJyA8PDwgIiRzIg==
83,M,20,finnish,english french swedish
44,F,20,finnish,english swedish
---
83,M,20,finnish,english french swedish
44,F,20,finnish,english swedish