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Full Discussion: Hardcoding & Record counts in a file
Top Forums UNIX for Dummies Questions & Answers Hardcoding & Record counts in a file Post 302549233 by alister on Monday 22nd of August 2011 10:23:22 AM
Old 08-22-2011
Quote:
Originally Posted by shruthidwh
I am not sure how to insert the headers and the record count at the starting of the file, as the file is huge i don't want to copy the file and make the changes.

is there any way by which i can add the four lines which out duplicating the file.
Quote:
Originally Posted by yazu
No way. You have to make a new copy of the file explicitly or implicitly (perl or GNU sed with -i option).
That's incorrect. ed can be used to modify a file without creating another file in the filesystem.

The following may give the original poster some ideas:
Code:
filename=data
ed -s "$filename" <<EOED
1i
FILENAME = $filename
DATETIME = $(date +%Y%m%d%H%M%S)
RECORD_COUNT = $(awk 'END {print NR}' "$filename")
.
w
q
EOED

Caveat: It's never been a problem for me, but keep in mind that ed uses a single dot on a line by itself to delimit the data being inserted. Should the inserted data itself contain a dot by itself on a line, it would need to be protected with an unambiguous decoration. After the insertion, the substitute command can be used to undecorate.
 

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LEARN ABOUT MOJAVE

mail::spf::v2::record5.18

Mail::SPF::v2::Record(3)				User Contributed Perl Documentation				  Mail::SPF::v2::Record(3)

NAME

       Mail::SPF::v2::Record - Sender ID ("spf2.0") record class

SYNOPSIS

       See Mail::SPF::Record.

DESCRIPTION

       An object of class Mail::SPF::v2::Record represents a Sender ID ("spf2.0") record.

   Constructors
       The following constructors are provided:

       new(%options): returns Mail::SPF::v2::Record
	   Creates a new Sender ID ("spf2.0") record object.

	   %options is a list of key/value pairs representing any of the following options:

	   text
	   terms
	   global_mods
	       See "new" in Mail::SPF::Record.

	   scopes
	       Required.  See "new" in Mail::SPF::Record.  The 'mfrom' and 'pra' scopes are supported.	There is no default.

       new_from_string($text, %options): returns Mail::SPF::v2::Record; throws Mail::SPF::ENothingToParse, Mail::SPF::EInvalidRecordVersion,
       Mail::SPF::ESyntaxError
	   Creates a new Sender ID ("spf2.0") record object by parsing the string and any options given.

   Class methods
       The following class methods are provided:

       version_tag_pattern: returns Regexp
	   Returns a regular expression that matches a version tag of 'spf2.0/' plus a comma-separated list of any of the 'mfrom' and 'pra'
	   scopes.  The following are valid version tags:

	       spf2.0/mfrom
	       spf2.0/pra
	       spf2.0/mfrom,pra
	       spf2.0/pra,mfrom

       default_qualifier
       results_by_qualifier
	   See "Class methods" in Mail::SPF::Record.

   Instance methods
       The following instance methods are provided:

       text
       scopes
       terms
       global_mods
       global_mod
       stringify
       eval
	   See "Instance methods" in Mail::SPF::Record.

       version_tag: returns string
	   Returns 'spf2.0/' plus a comma-separated list of the scopes of the record.  See "version_tag_pattern" for a list of possible return
	   values.

SEE ALSO

       Mail::SPF, Mail::SPF::Record, Mail::SPF::Term, Mail::SPF::Mech, Mail::SPF::Mod

       <http://tools.ietf.org/html/rfc4408>

       For availability, support, and license information, see the README file included with Mail::SPF.

AUTHORS

       Julian Mehnle <julian@mehnle.net>, Shevek <cpan@anarres.org>

perl v5.18.2							    2017-10-06						  Mail::SPF::v2::Record(3)
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