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Adding the file name as the first line of the file

 
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# 1  
Old 09-26-2014
Adding the file name as the first line of the file
I have a lot of files under a folder and each file has a different name. I want to add each file's name as the first line of each file. How can I do this? I was trying to use this script
Code:
for file in *; do echo $file >tempfile; cat $file >>tempfile; mv tempfile $file; done

, but there are some random files cannot be added the title names on the first line under this script.
Thank you in advance.
# 2  
Old 09-26-2014
While the idea sounds a bit strange, you can make it more robust like this:
Code:
ls | while IFS="" read -r file
do
  read hasline1 < "$file"
  if [ "$hasline1" != "$file" ]
  then
    (echo "$file"; cat "$file") > /tmp/tempfile.$$ &&
    cp /tmp/tempfile.$$ "$file"
  fi
done

This User Gave Thanks to MadeInGermany For This Post:
yuejian
# 3  
Old 09-26-2014
Quote:
Originally Posted by MadeInGermany
While the idea sounds a bit strange, you can make it more robust like this:
Code:
ls | while IFS="" read -r file
do
  read hasline1 < "$file"
  if [ "$hasline1" != "$file" ]
  then
    (echo "$file"; cat "$file") > /tmp/tempfile.$$ &&
    cp /tmp/tempfile.$$ "$file"
  fi
done

Thank you so much, it works perfectly and no error.
 
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