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insert filename into file using SED (or AWK)

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# 1  
Old 08-06-2006
insert filename into file using SED (or AWK)
Hi,
I would like to insert a file's filename into the first line of that file - for a batch of files. Is this possible using SED? Thanks in advance.
# 2  
Old 08-06-2006
Code:
for file in `ls -1 *`
do
    echo "$file" > ./tmpfile
    cat "$file" >> ./tmpfile
    mv ./tmpfile "$file"
done

is one way to do this.
# 3  
Old 08-06-2006
How about this:
Code:
for i in *; do
ex $i <<EOF
i
$i
.
wq
EOF
done

I doubt that it would be very easy to do it using sed, as sed writes to standard output. You would have to pull stunts like redirecting standard output to a file at the beginning of the script and changing that for every file that you want to change...
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