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howto add line as a first line into a non empty file

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# 1  
Old 05-30-2010
howto add line as a first line into a non empty file
Hi

Trying to do like this :

echo "$variable1\n $(cat file.txt)"

but it only adds one time. When I run this cmd again with different variable it only replaces line of variable1.

How to add constantly line into first line in file ?
# 2  
Old 05-30-2010
one way:
Code:
echo "$variable" > tmpfile
cat oldfile >> tmpfile
mv tmp oldfile

# 3  
Old 05-30-2010
Code:
sed -ie '1i\
'$variable'\
' file.txt

# 4  
Old 06-03-2010
thx but how to implement this here
https://www.unix.com/shell-programmin...00-bajtow.html
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