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awk -vFS= '{$5=$5".";$26=$26"."}1' OFS= file

awk '!/^,,,,/' file

echo livingroom-110111105637.avi | sed -r 's@(.*-......)(..)(..)(..)@\1-\2.\3.\4@'

awk -vRS="TAG END" -vFS="\n" '/LOCATION/{gsub(/\047/,"`",$1);gsub(/\042/,"``",$1);print}' ORS="TAG END" file

awk -vFS= -vj=0 '{
for(i=1;i<=NF;i++){
j++;
if($i~/[cC]/){
print j
}
}
}' file

-v option (http://www.gnu.org/manual/gawk/html_node/Quoting.html#Quoting)

Regexp (http://www.gnu.org/manual/gawk/html_node/Regexp.html#Regexp) Patterns and Actions (http://www.gnu.org/manual/gawk/html_node/Patterns-and-Actions.html#Patterns-and-Actions)

#!/bin/bash
var="/path/*.{doc,odt}"

awk -F"|" '$1~/BELL-1180-1180-81/ && $2!~/:10[12]$/' file

awk -vRS="" -vFS="\n" '/Age/{re=$1} $0~re{print }' file

awk '$4{f=1;exit}END{ print f?"problem":"fine"}' file

awk '/000+/{print}' file

awk -F"." '{u[$1]=$0}END{for(i in u) print u[i]}'

awk '/IM/{h=$0};/B2/{print h"\n"$0;exit}' file

sed -r 's/^(.).*/\1/' file
sed -rn 's/^[[:space:]]*([[:alpha:]]).*/\1/p' file

sed -r 's/^(.).*/\1/' file

@mtomar, don't do other people's homework. Besides, your solution is a perfect example of shoddy programming.