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echo '<?xml version="1.0" encoding="UTF-8"?>' > outfile.txt && echo "<documentbody>$(cat infile.txt)</documentbody>" >> outfile.txt

echo "<documentbody>$(cat infile.txt)</documentbody>" > outfile.txt

This would remove tags <ABC> and digits included

sed -e 's#<ABC>[0-9]\+</ABC>##g'

new Widget (http://souptonuts.sourceforge.net/welcome.php)

See "Encrypt and Decrypt" section

I would avoid at any price to call system from a perl script.
Here's a quick try

perl -e 'opendir (DIR, $ARGV[0]) ; @count = readdir(DIR); $count = @count; print $count-2,"\n"'...

Funny complication, but it somehow works


for j in $(for i in *agl ; do echo $i | sed -e 's/\([a-z]\+\)\([0-9]\+\)/\2\1/g' ; done | sort | sed -e 's/\([0-9]\+\)\([a-z]\+\)/\2\1/g') ; do ls -l $j...

How about generating a 3rd file called file3 that contains the same lines and filled with "|" symbol

for i in $(seq 1 $(wc -l file2 | awk '{print $1}')); do echo "|" ; done > file3


Then...