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sed a file and maintain date stamp and permissions

 
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# 1  
Old 08-12-2010
sed a file and maintain date stamp and permissions
I need to alter a file.
I'm using sed then passing output to temp file
then using touch -r to maintain the date but the permissions do not get preserved
How can I sed a file and maintain date and permissions

currently

Quote:
sed 's/oldstring/newstring/g' file > tempfile
touch -r file tempfile
mv tempfile file
it's preserving the date but the permissions revert back to the standard -rw-r--r--
# 2  
Old 08-12-2010
You can use

Code:
chmod --reference file tempfile

after touch command
# 3  
Old 08-12-2010
there's no --reference option in chmod... ??
# 4  
Old 08-13-2010
GNU/Linux has chmod --reference, but if yours doesn't, assuming original file has write permissions enabled, you can make a copy of the original file retaining permissions, then overwrite it.
cp -p file tempfile
sed ... > tempfile
touch -r file tempfile
mv tempfile file
 
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