I have a text file that contains 4 million lines, each line contains 2 fields(colon as field separator).
....
Here I have to split the second field(can be up to 40,000 fields) by comma into an array for analysis,
.....
How to solve this problem? or you have other alternatives to replacing the split function?
Calling the external command will be to slow (4,000,000 x 40,000 = 160,000,000,000 calls).
Please answer Franklin52 previous question.
Hi all!
I am relatively new to UNIX staff, and I have come across a problem:
I have a big directory, which contains 100 smaller ones. Each of the 100 contains a file ending in .txt , so there are 100 files ending in .txt
I want to split each of the 100 files in smaller ones, which will contain... (4 Replies)
$mystring = "name:blk:house::";
print "$mystring\n";
@s_format = split(/:/, $mystring);
for ($i=0; $i <= $#s_format; $i++) {
print "index is $i,field is $s_format";
print "\n";
}
$size = $#s_format + 1;
print "total size of array is $size\n";
i am expecting my size to be 5, why is it... (5 Replies)
I have gone through all the threads in the forum and tested out different things. I am trying to split a 3GB file into multiple files. Some files are even larger than this.
For example:
split -l 3000000 filename.txt
This is very slow and it splits the file with 3 million records in each... (10 Replies)
Hi,
I have some output in the form of:
#output:
abc123
def567
hij890
ghi324
the above is in one column, stored in the variable x ( and if you wana know about x... x=sprintf(tolower(substr(someArray,1,1)substr(userArray,3,1)substr(userArray,2,1)))
when i simply print x (print x) I get... (7 Replies)
Hi... I have a question regarding the split function in PERL.
I have a very huge csv file (more than 80 million records). I need to extract a particular position(eg : 50th position) of each line from the csv file. I tried using split function. But I realized split takes a very long time.
Also... (1 Reply)
Hi... I have a question regarding the split function in PERL.
I have a very huge csv file (more than 80 million records). I need to extract a particular position(eg : 50th position) of each line from the csv file. I tried using split function. But I realized split takes a very long time.
Also... (0 Replies)
Hi... I have a question regarding the split function in PERL.
I have a very huge csv file (more than 80 million records). I need to extract a particular position(eg : 50th position) of each line from the csv file. I tried using split function. But I realized split takes a very long time.
Also... (1 Reply)
my @d =split('\|', $_);
west|ACH|3|Y|LuV|N||N||
Qt|UWST|57|Y|LSV|Y|Bng|N|KT|
It Returns d as 8 for First Line, and 9 as for Second Line . I want to Process Both the Files, How to Handle It. (3 Replies)
Hello;
I have a file consists of 4 columns separated by tab. The problem is the third fields. Some of the them are very long but can be split by the vertical bar "|". Also some of them do not contain the string "UniProt", but I could ignore it at this moment, and sort the file afterwards. Here is... (5 Replies)
Discussion started by: yifangt
5 Replies
LEARN ABOUT NETBSD
usleep
USLEEP(3) BSD Library Functions Manual USLEEP(3)NAME
usleep -- suspend execution for interval of microseconds
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <unistd.h>
int
usleep(useconds_t microseconds);
DESCRIPTION
The usleep() function suspends execution of the calling process until either the number of microseconds specified by microseconds have
elapsed or a signal is delivered to the calling process and its action is to invoke a signal catching function or to terminate the process.
The suspension time may be longer than requested due to the scheduling of other activity by the system.
The microseconds argument must be less than 1,000,000. If the value of microseconds is 0, then the call has no effect.
RETURN VALUES
On successful completion, usleep() returns 0. Otherwise, it returns -1 and sets errno to indicate the error.
ERRORS
The usleep() function may fail if:
[EINVAL] The microseconds interval specified 1,000,000 or more microseconds.
SEE ALSO nanosleep(2), sleep(3)STANDARDS
The usleep() function conforms to X/Open Portability Guide Issue 4, Version 2 (``XPG4.2''). It later appeared in the POSIX standard, but in
IEEE Std 1003.1-2004 (``POSIX.1'') it was marked as legacy and the use of nanosleep(2) was recommended instead. The IEEE Std 1003.1-2008
(``POSIX.1'') revision removed usleep() from the specification.
HISTORY
The usleep() function appeared in 4.3BSD.
BSD April 29, 2010 BSD