Sponsored Content
Top Forums Shell Programming and Scripting insert a header in a huge data file without using an intermediate file Post 302286265 by jim mcnamara on Tuesday 10th of February 2009 03:51:42 PM
Old 02-10-2009
There are 'edit in place' features for GNU sed and for perl (perl -pie ' perl script here').
However they do use tmp files behind the scenes
 

10 More Discussions You Might Find Interesting

1. UNIX for Advanced & Expert Users

Insert a line as the first line into a very huge file

Hello, I need to insert a line (like a header) as the first line of a very huge file (about 3 ml rows). I am able to do it with sed, but redirecting the output and creating a new file takes quite some time. I was wondering if there was a more efficient way of doing it? Any help would be... (3 Replies)
Discussion started by: shriek
3 Replies

2. UNIX for Dummies Questions & Answers

search and grab data from a huge file

folks, In my working directory, there a multiple large files which only contain one line in the file. The line is too long to use "grep", so any help? For example, if I want to find if these files contain a string like "93849", what command I should use? Also, there is oder_id number... (1 Reply)
Discussion started by: ting123
1 Replies

3. Shell Programming and Scripting

How to extract data from a huge file?

Hi, I have a huge file of bibliographic records in some standard format.I need a script to do some repeatable task as follows: 1. Needs to create folders as the strings starts with "item_*" from the input file 2. Create a file "contents" in each folders having "license.txt(tab... (5 Replies)
Discussion started by: srsahu75
5 Replies

4. Programming

to find header in Mp3 file and retrieve data

hi all, In an mp3 file , data is arranged in sequence of header and data ,how to retrieve data between two headers. Is the data between two headers fixed? because as per theory it says 1152 samples will be there , but dont knw how many bits one sample correspond to? it would help if any c... (2 Replies)
Discussion started by: shashi
2 Replies

5. Shell Programming and Scripting

Three Difference File Huge Data Comparison Problem.

I got three different file: Part of File 1 ARTPHDFGAA . . Part of File 2 ARTGHHYESA . . Part of File 3 ARTPOLYWEA . . (4 Replies)
Discussion started by: patrick87
4 Replies

6. Shell Programming and Scripting

Help- counting delimiter in a huge file and split data into 2 files

I’m new to Linux script and not sure how to filter out bad records from huge flat files (over 1.3GB each). The delimiter is a semi colon “;” Here is the sample of 5 lines in the file: Name1;phone1;address1;city1;state1;zipcode1 Name2;phone2;address2;city2;state2;zipcode2;comment... (7 Replies)
Discussion started by: lv99
7 Replies

7. Shell Programming and Scripting

Extract header data from one file and combine it with data from another file

Hi, Great minds, I have some files, in fact header files, of CTD profiler, I tried a lot C programming, could not get output as I was expected, because my programming skills are very poor, finally, joined unix forum with the hope that, I may get what I want, from you people, Here I have attached... (17 Replies)
Discussion started by: nex_asp
17 Replies

8. Shell Programming and Scripting

Insert date/time header at top of file

I'm trying to take mrt output and put it at the top of a file along with the date and time. I was able to do it at the bottom of the file with the following printf "********** $(date) **********\n\n" >> $OUTPUT_PATH/$HOSTNAME mtr -r -w -c 10 $HOSTADDRESS >> $OUTPUT_PATH/$HOSTNAME printf... (2 Replies)
Discussion started by: kramer65
2 Replies

9. UNIX for Advanced & Expert Users

Need Optimization shell/awk script to aggreagte (sum) for all the columns of Huge data file

Optimization shell/awk script to aggregate (sum) for all the columns of Huge data file File delimiter "|" Need to have Sum of all columns, with column number : aggregation (summation) for each column File not having the header Like below - Column 1 "Total Column 2 : "Total ... ...... (2 Replies)
Discussion started by: kartikirans
2 Replies

10. UNIX for Advanced & Expert Users

File comaprsons for the Huge data files ( around 60G) - Need optimized and teh best way to do this

I have 2 large file (.dat) around 70 g, 12 columns but the data not sorted in both the files.. need your inputs in giving the best optimized method/command to achieve this and redirect the not macthing lines to the thrid file ( diff.dat) File 1 - 15 columns File 2 - 15 columns Data is... (9 Replies)
Discussion started by: kartikirans
9 Replies
HOTSWAPRC(5)							File Formats Manual						      HOTSWAPRC(5)

NAME
hotswaprc - configuration file for hotswap DESCRIPTION
/etc/hotswaprc is the global configuration file for the hotswap utility. It allows system administrators to specify arbitrary shell scripts to be run after a device is inserted, as well as before and after it is removed. Scripts are selected according to the model name retrieved from the device. This is particularly helpful for automatic configura- tion of CD-RW drives, which require SCSI emulation and bypass normal access via the IDE subsystem. hotswaprc is implemented as an Extensible Mark-up Language (XML) application. XML documents are structured using elements of the form <tag-name> content <tag-name>. A Document Type Definition (DTD) describes the possible content of each element. Please refer to the XML specification for more information. The hotswap distribution also contains an example file, doc/hotswaprc.example, which includes the DTD for the configuration file format. ELEMENTS
<hotswap> This is the root element of the document. Each valid hotswaprc must contain exactly one <hotswap> element. The <hotswap> element may contain an arbitrary number of <device> elements. <device> The configuration file contains one <device> element for every device for which scripts are defined. The <device> element is com- posed of the following elements in this order: <name>, <post-insert>, <pre-remove>, <post-remove>. All but <name> are optional. <name> The content of this element is the model identification string of the IDE device the current <device> element refers to. <post-insert> Contains the shell script that is to be executed after the device has been inserted and registered with the kernel. <pre-remove> Contains the shell script that is to be run before hotswap attempts to unregister the device. <post-remove> Contains the shell script that is to be run after the device had been unregistered. REPORT BUGS
Report bugs to t.stadelmann1@physics.ox.ac.uk. AUTHOR
Written by Tim Stadelmann. SEE ALSO
hotswap(1), xhotswap(1). COPYRIGHT
Copyright (c) 2002-2003 Tim Stadelmann. Permission is granted to copy, distribute and/or modify this document under the terms of the GNU General Public License (GPL), Version 2 or any later version published by the Free Software Foundation. 26th November 2002 HOTSWAPRC(5)
All times are GMT -4. The time now is 05:07 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy