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Thanks to both System Shock and vish indian! It seems there is no easy way for sed to do it. I have to use awk, perl, or something else ...

I agree - it's up to you. I like to use cat to pipe everything to next command. The above command is the same as following:

sed -n -e 's/.*\([0-9]\{10\}\).*/\1/p' t1.txt t2.txt t3.txt t4.txt t5.txt

Sorry, I missed the details in original post - if it's one character, you have to use the octal.

send the contents of the files (1 -5) to sed command for processing.

Try this:

your_variable=`cat t1.txt t2.txt t3.txt t4.txt t5.txt | sed -n -e 's/.*\([0-9]\{10\}\).*/\1/p'`

try this:

cat <your_file_name> | sed -e 's/\^@//g' > output.txt

Hi all:

I have a file in which the contents are as following:

...
This is a test
ONE
TWO
Hello, world!
XXX YYY CCC
test again
three, four
five
six
seven
world
AAA BBB QQQ
test...