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Top Forums UNIX for Advanced & Expert Users Insert a line as the first line into a very huge file Post 65529 by bhargav on Monday 7th of March 2005 12:59:27 AM
Old 03-07-2005
Let 's say header is redirected to a file 'tmp'
If larger file is 'file1'


what about

Code:
cat tmp file1 > file2
mv file2 file1

It may be faster than 'sed'
 

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SHAPELIB(1)							   User Commands						       SHAPELIB(1)

NAME
dbfdump - dump xBase DBF files as text SYNOPSIS
dbfdump [-h] [-m] [-r] file DESCRIPTION
Dumps the contents of file to standard output. The first line contains the field names appearing in file, and each of the following lines contains the field values of a record. Field names and values are padded by spaces to their field widths. Empty fields are printed as the string "(NULL)". OPTIONS
-h Prints the column field definitions before other output. Each field definition consists of a line of the form Field: index, Type=type, Title=`name', Width=width, Decimals=precision where index is the zero offset column number of the field; the type indicates the datatype of the field value and is either "Inte- ger", "Real" or "String"; name is the field's name; width is the number of bytes reserved for the field's value; and precision is the number of decimal places of precision for "Real" type fields, and is zero for "Integer" and "String" type fields. -m Prints each record in multiline format separated by empty lines. The first line of a record gives the number of the record in the form Records: record_index where record_index is the zero offset number of the record in the file, and then each field of the record appears on its own line in the format name: value -r Prints the exact bytes occurring in file for field values and suppresses printing "(NULL)" for empty values. EXIT STATUS
0 Successful program execution. 1 Missing file argument. 2 Failed to open file. 3 There are no fields in file. DIAGNOSTICS
The following diagnostics may be issued on stdout: DBFOpen(file,"r") failed. There are no fields in this table! AUTHORS
Frank Warmerdam (warmerdam@pobox.com) is the maintainer of the shapelib shapefile library. Joonas Pihlaja (jpihlaja@cc.helsinki.fi) wrote this man page. BUGS
Unless the -r option is given, values in numeric fields that overflow the int or double types of the C language are printed as plus or minus a huge number. For integer fields the huge value is HUGE_VALL from <stdlib.h> and for real fields it is HUGE_VALF. SEE ALSO
dbf_dump(1), dbfcreate(1), dbfadd(1), shpadd(1), shpcreate(1), shpdump(1), shprewind(1) shapelib OCTOBER 2004 SHAPELIB(1)
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