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Full Discussion: Adding the file name as the first line of the file
Top Forums UNIX for Dummies Questions & Answers Adding the file name as the first line of the file Post 302919013 by yuejian on Friday 26th of September 2014 04:21:54 PM
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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LEARN ABOUT DEBIAN

test::tempdir

Test::TempDir(3pm)					User Contributed Perl Documentation					Test::TempDir(3pm)

NAME

       Test::TempDir - Temporary files support for testing.

SYNOPSIS

	       use Test::TempDir;

	       my $test_tempdir = temp_root();

	       my ( $fh, $file ) = tempfile();

	       my $directory_scratch_obj = scratch();

DESCRIPTION

       Test::TempDir provides temporary directory creation with testing in mind.

       The differences between using this and using File::Temp are:

       o   If "t/tmp" is available (writable, creatable, etc) it's preferred over $ENV{TMPDIR} etc. Otherwise a temporary directory will be used.

	   This is "temp_root"

       o   Lockfiles are used on "t/tmp", to prevent race conditions when running under a parallel test harness.

       o   The "temp_root" is cleaned at the end of a test run, but not if tests failed.

       o   "temp_root" is emptied at the begining of a test run unconditionally.

       o   The default policy is not to clean the individual "tempfiles" and "tempdirs" within "temp_root", in order to aid in debugging of failed
	   tests.

EXPORTS

       temp_root
	   The root of the temporary stuff.

       tempfile
       tempdir
	   Wrappers for the File::Temp functions of the same name.

	   The default options are changed to use "temp_root" for "DIR" and disable "CLEANUP", but these are overridable.

       scrach
	   Loads Directory::Scratch and instantiates a new one, with the same default options as "tempfile" and "tempdir".

SEE ALSO

       File::Temp, Directory::Scratch, Path::Class

VERSION CONTROL

       This module is maintained using Git. You can get the latest version from <git://github.com/nothingmuch/test-tempdir.git>.

AUTHOR

       Yuval Kogman <nothingmuch@woobling.org>

COPYRIGHT

	       Copyright (c) 2008 Yuval Kogman. All rights reserved
	       This program is free software; you can redistribute
	       it and/or modify it under the same terms as Perl itself.

perl v5.10.0							    2009-08-11							Test::TempDir(3pm)
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