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Add file's date at beginning of every line in file

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Operating Systems Linux Add file's date at beginning of every line in file
# 1  
Old 09-30-2010
Add file's date at beginning of every line in file
How would I do that?

/Rutger
# 2  
Old 09-30-2010
Code:
$ ruby -ne 'BEGIN{s=File.mtime("file").to_s.gsub(/\s+/,"")};print "#{s} #{$_}" ' file

This User Gave Thanks to kurumi For This Post:
rutgerblom
# 3  
Old 09-30-2010
Unfortunately I'm not having access to Ruby. I was more thinking of a solution that uses sed, awk, cat, or grep.

/Rutger
# 4  
Old 10-03-2010
something along the lines of
Code:
 sed -e s/^/"`date` "/g FILE

Note: You will need the -i parameter for sed to change the file in place. The code above is non disruptive and non destructive to the original file.
This User Gave Thanks to mark54g For This Post:
rutgerblom
# 5  
Old 10-03-2010
Quote:
Originally Posted by kurumi
Code:
$ ruby -ne 'BEGIN{s=File.mtime("file").to_s.gsub(/\s+/,"")};print "#{s} #{$_}" ' file

FYI, on OSX:

Code:
apple:~ neo$ vi aaa
apple:~ neo$ ruby -ne 'BEGIN{s=File.mtime("file").to_s.gsub(/\s+/,"")};print "#{s} #{$_}" ' aaa
-e:1:in `mtime': No such file or directory - file (Errno::ENOENT)
        from -e:1

# 6  
Old 10-03-2010
I worked it out myself. I actually needed to do this operation on a couple of hundred files. The quick-and-dirty script looks like this:

Code:
#!/bin/bash
for i in *
do
awk -v string1=`ls $i |cut -c -14` '{ print string1";" $0 }' $i>> merged
done

FYI: the first 14 characters of the filename contained the date and time the file was created so I used that as the source for getting the file's date. The ";" character is the delimiter.

Rutger
# 7  
Old 10-03-2010
Quote:
Originally Posted by Neo
FYI, on OSX:
I presume "aaa" is an empty file? FYI, on Linux and using 1.9.1,
Code:
$ wc -l < aaa
0
$ ruby -ne 'BEGIN{s=File.mtime("file").to_s.gsub(/\s+/,"")};print "#{s} #{$_}" ' aaa

It doesn't spew any errors. Thanks for this info on OSX
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