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awk '{print > ("File"((/\|/)?"A":"B")".txt")}' File1.txt

Try:
sed 's|\(....\)\(..\)\(..\)\(..\)\(..\)\(..\)|\1/\2/\3;\4:\5:\6:|' infile

How about using awk

zcat /var/log/messages.2.gz | awk -v MAC=0012CFCDA11A -v C=0 '{ if ($0 ~ "DHCPDIS.*94.18.*"MAC ) C++ } END { print C, MAC }'

echo 'a|b|c|' | sed 's/[^|][^|]*/&|&/g'

awk ' { a[$1] = a[$1] == "" ? $2 : a[$1] " " $2 } END { for ( i in a ) { print i " " a[i] } } ' file | sort

csplit is for you. Read your documentation. /^2/ is the regular expression you need. See what you can come up with. We will help when you come back with questions.

Hi, welcome to the forum. This would be one way of doing that:
mv "$file" "$(head -1 "$file")"

sort -n -k1.9,1.12