It's the simplest and most reliable way to tell whether a line's a duplicate or not. sort is actually pretty sophisticated, capable of handling extremely huge files without bogging down. Once it's done so, any duplicate lines will show up all in a row, letting you use uniq to get rid of them.
Quote:
Thirdly please explain why use mknod?
He's actually making a named pipe. On many systems you can just use mkfifo for that.
Hi,
As per my requirement, I need to take difference between two big files(around 6.5 GB) and get the difference to a output file without any line numbers or '<' or '>' in front of each new line.
As DIFF command wont work for big files, i tried to use BDIFF instead.
I am getting incorrect... (13 Replies)
Hi , i need a fast way to delete duplicates entrys from very huge files ( >2 Gbs ) , these files are in plain text.
I tried all the usual methods ( awk / sort /uniq / sed /grep .. ) but it always ended with the same result (memory core dump)
In using HP-UX large servers.
Any advice will... (8 Replies)
Hi i need to compare two fixed length files and produce the differences if any to a seperate file. I have to capture each and every differneces line by line. Ideally my files should not have any differences but if there are any then it should be captured without any miss. Also my files sizes are... (4 Replies)
Hi
I have to write a script to split the huge file into several pieces. The file columns is | pipe delimited. The data sample is as:
6625060|1420215|07308806|N|20100120|5572477081|+0002.79|+0000.00|0004|0001|......... (3 Replies)
Hi, all:
I've got two folders, say, "folder1" and "folder2".
Under each, there are thousands of files.
It's quite obvious that there are some files missing in each. I just would like to find them. I believe this can be done by "diff" command.
However, if I change the above question a... (1 Reply)
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)
Hi,
I have a Huge 7 GB file which has around 1 million records, i want to split this file into 4 files to contain around 250k messages each.
Please help me as Split command cannot work here as it might miss tags..
Format of the file is as below
<!--###### ###### START-->... (6 Replies)
Hi Friends !!
I am facing a hash total issue while performing over a set of files of huge volume:
Command used:
tail -n +2 <File_Name> |nawk -F"|" -v '%.2f' qq='"' '{gsub(qq,"");sa+=($156<0)?-$156:$156}END{print sa}' OFMT='%.5f'
Pipe delimited file and 156 column is for hash totalling.... (14 Replies)
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
LEARN ABOUT CENTOS
gethugepagesizes
GETHUGEPAGESIZES(3) Library Functions Manual GETHUGEPAGESIZES(3)NAME
gethugepagesizes - Get the system supported huge page sizes
SYNOPSIS
#include <hugetlbfs.h>
int gethugepagesizes(long pagesizes[], int n_elem);
DESCRIPTION
The gethugepagesizes() function returns either the number of system supported huge page sizes or the sizes themselves. If pagesizes is
NULL and n_elem is 0, then the number of huge pages the system supports is returned. Otherwise, pagesizes is filled with at most n_elem
page sizes.
RETURN VALUE
On success, either the number of huge page sizes supported by the system or the number of huge page sizes stored in pagesizes is returned.
On failure, -1 is returned and errno is set appropriately.
ERRORS
EINVAL n_elem is less than zero or n_elem is greater than zero and pagesizes is NULL.
Also see opendir(3) for other possible values for errno. This error occurs when the sysfs directory exists but cannot be opened.
NOTES
This call will return all huge page sizes as reported by the kernel. Not all of these sizes may be usable by the programmer since mount
points may not be available for all sizes. To test whether a size will be usable by libhugetlbfs, hugetlbfs_find_path_for_size() can be
called on a specific size to see if a mount point is configured.
SEE ALSO oprofile(1), opendir(3), hugetlbfs_find_path_for_size(3), libhugetlbfs(7)AUTHORS
libhugetlbfs was written by various people on the libhugetlbfs-devel mailing list.
October 10, 2008 GETHUGEPAGESIZES(3)