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Hello,

I recommend you read: Sed - An Introduction and Tutorial (http://www.grymoire.com/Unix/Sed.html)

.* is:
. = any character
* = the "anterior" repeated any times

so, .* is "any...

try:

sed "150s/.*/HELLO/" FICHERO_IN

sed '150s/.*/HELLO/' infile

Hello again! ..:)

try with this:
contador=0
salir=0
while [ salir -eq 0 ]
do
if [ -f fichero$contador ]
then
echo "fichero fichero$contador existe"
...

$ basename /home/Desktop/example/audio.html .html
audio

this would be more succinct.
awk '/name/ {print NR; exit}' file

Try:

awk '/name/ {print NR}' file | head -1

also,

awk '/name/ {print NR;exit}' file

awk -v cntr=1 ' /hello/{cntr++} {print >"file"cntr}' file