08-14-2007
Overwrite & Delete in Text File
Dear All,
I have text file like this:
Header
Record 1
Record 2
.......
Record n
Tail
This line of code :
awk '{ if ( NR == 1 ) { head=substr($0,1,300);} else { last = substr($0,1,300);}END{printf "Header is : %-300s Trailer is : %-300s\n", head, last}' filename
converted Header and Trailer in one line and within 300 character each.The output is just one line.
Now I want to overwrite this one line above (Header+ Tail) over the first line of original file (orginal header) and delete the Tail........i can copy this header and tail to new file and then append Record 1 to Record n to this new file, but that will cause too low performance........so I think better to update first and the last line of the this file.................so how can i do that?
i.e. 1-update the header with new line i.e. (header+trailer)
2-delete the tail in original file (may be using cut tail -1 filename?)
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LEARN ABOUT DEBIAN
encode::mime::header
Encode::MIME::Header(3pm) User Contributed Perl Documentation Encode::MIME::Header(3pm)
NAME
Encode::MIME::Header -- MIME 'B' and 'Q' header encoding
SYNOPSIS
use Encode qw/encode decode/;
$utf8 = decode('MIME-Header', $header);
$header = encode('MIME-Header', $utf8);
ABSTRACT
This module implements RFC 2047 Mime Header Encoding. There are 3 variant encoding names; "MIME-Header", "MIME-B" and "MIME-Q". The
difference is described below
decode() encode()
----------------------------------------------
MIME-Header Both B and Q =?UTF-8?B?....?=
MIME-B B only; Q croaks =?UTF-8?B?....?=
MIME-Q Q only; B croaks =?UTF-8?Q?....?=
DESCRIPTION
When you decode(=?encoding?X?ENCODED WORD?=), ENCODED WORD is extracted and decoded for X encoding (B for Base64, Q for Quoted-Printable).
Then the decoded chunk is fed to decode(encoding). So long as encoding is supported by Encode, any source encoding is fine.
When you encode, it just encodes UTF-8 string with X encoding then quoted with =?UTF-8?X?....?= . The parts that RFC 2047 forbids to
encode are left as is and long lines are folded within 76 bytes per line.
BUGS
It would be nice to support encoding to non-UTF8, such as =?ISO-2022-JP? and =?ISO-8859-1?= but that makes the implementation too
complicated. These days major mail agents all support =?UTF-8? so I think it is just good enough.
Due to popular demand, 'MIME-Header-ISO_2022_JP' was introduced by Makamaka. Thre are still too many MUAs especially cellular phone
handsets which does not grok UTF-8.
SEE ALSO
Encode
RFC 2047, <http://www.faqs.org/rfcs/rfc2047.html> and many other locations.
perl v5.14.2 2011-08-09 Encode::MIME::Header(3pm)