04-20-2016
The NR%10 will distribute the lines as evenly as possible between 10 files, writing every single line to the next (rotating) file, independent of the total number of lines.
If the open file count is less then the max. allowed open files, close(f) is not indispensable, although it were good style - normally. In your case of 1E7 lines, it would mean 1E7 open and 1E7 close operations, slowing down processing considerably. Me, I'd forgo it.
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Hello,
i have another sed question.. I'm trying to do variable substition with sed and i'm running into a problem.
my var1 is a string constructed like this:
filename1 filerev1 filepath1
my var2 is another string constructed like this:
filename2 filerev2 filepath2
when i do... (2 Replies)
Discussion started by: alrinno
2 Replies
2. Shell Programming and Scripting
I need to write a login script for multiple computers, however, one of the directories in question will have a different name from computer to computer.
~/Library/Application\ Support/Firefox/Profiles/<unique filename>.default/myfile
For the directory named <unique filename>.default , I... (2 Replies)
Discussion started by: glev2005
2 Replies
3. Shell Programming and Scripting
I've been working on a UNIX script (csh) that will be starting a java application
The goal is to get the version number and location (needed by the application) from the path of the script
Example:
Location of the script= /apps/myapp/versionNum/script/start.csh
I need:... (8 Replies)
Discussion started by: brianjbrady
8 Replies
4. Shell Programming and Scripting
I'm trying to write my first shell script and got a bit stuck with this:
I've got myscript.sh that executes from /fromhere.
If the script is run with the syntax ./myscript.sh tothere:
I need to make a variable inside the script containing /fromhere/tothere
...and if the script is run with... (10 Replies)
Discussion started by: Chronomaly
10 Replies
5. Shell Programming and Scripting
Hi,
I have following path:
set file_path = D:/forums/prac/somedir/new1/file1.txt
or set file_path = E:/new/forums1/prac/somedir/new2/file2.txt
I need to grep "somedir" from file path. In this case preceding directory "prac" remains same for both the paths, but directories preceding... (7 Replies)
Discussion started by: sarbjit
7 Replies
6. UNIX for Dummies Questions & Answers
I have a script like this running under OS X 10.8. The problem arises when the find command encounters a space in the path name. I need the "dir" variable as I'll be extending the script to more general use.
#!/bin/bash
CFS=$IFS
IFS=$(echo)
set dir = "/Users/apta/Library/Mail\... (3 Replies)
Discussion started by: apta
3 Replies
7. UNIX for Dummies Questions & Answers
Hai
how can I assign directory path to a variable in perl
Thanks&Regards
kiran (2 Replies)
Discussion started by: kiran425
2 Replies
8. UNIX for Advanced & Expert Users
Hai
how can I assign directory path to a variable in perl
Thanks&Regards
kiran (3 Replies)
Discussion started by: kiran425
3 Replies
9. Shell Programming and Scripting
Hi All,
Need some help in parsing a directory listing .. output into 2 files
Input file
level1,/level2/level3/level4/ora001,10,IBB23
level1,/level2/level3/level4/ora001/blu1,,IBB23
level1,/level2/level3/level4/ora001/clu1,,IBB23
level1,/level2/level3/level4/ora002,,IBB24... (10 Replies)
Discussion started by: greycells
10 Replies
10. UNIX for Beginners Questions & Answers
What is the difference ../directory path and ./directory path in ksh? (1 Reply)
Discussion started by: TestKing
1 Replies
LEARN ABOUT OPENSOLARIS
fdwalk
closefrom(3C) Standard C Library Functions closefrom(3C)
NAME
closefrom, fdwalk - close or iterate over open file descriptors
SYNOPSIS
#include <stdlib.h>
void closefrom(int lowfd);
int fdwalk(int (*func)(void *, int), void *cd);
DESCRIPTION
The closefrom() function calls close(2) on all open file descriptors greater than or equal to lowfd.
The effect of closefrom(lowfd) is the same as the code
#include <sys/resource.h>
struct rlimit rl;
int i;
getrlimit(RLIMIT_NOFILE, &rl);
for (i = lowfd; i < rl.rlim_max; i++)
(void) close(i);
except that close() is called only on file descriptors that are actually open, not on every possible file descriptor greater than or equal
to lowfd, and close() is also called on any open file descriptors greater than or equal to rl.rlim_max (and lowfd), should any exist.
The fdwalk() function first makes a list of all currently open file descriptors. Then for each file descriptor in the list, it calls the
user-defined function, func(cd, fd), passing it the pointer to the callback data, cd, and the value of the file descriptor from the list,
fd. The list is processed in file descriptor value order, lowest numeric value first.
If func() returns a non-zero value, the iteration over the list is terminated and fdwalk() returns the non-zero value returned by func().
Otherwise, fdwalk() returns 0 after having called func() for every file descriptor in the list.
The fdwalk() function can be used for fine-grained control over the closing of file descriptors. For example, the closefrom() function can
be implemented as:
static int
close_func(void *lowfdp, int fd)
{
if (fd >= *(int *)lowfdp)
(void) close(fd);
return(0);
}
void
closefrom(int lowfd)
{
(void) fdwalk(close_func, &lowfd);
}
The fdwalk() function can then be used to count the number of open files in the process.
RETURN VALUES
No return value is defined for closefrom(). If close() fails for any of the open file descriptors, the error is ignored and the file
descriptors whose close() operation failed might remain open on return from closefrom().
The fdwalk() function returns the return value of the last call to the callback function func(), or 0 if func() is never called (no open
files).
ERRORS
No errors are defined. The closefrom() and fdwalk() functions do not set errno but errno can be set by close() or by another function
called by the callback function, func().
FILES
/proc/self/fd directory (list of open files)
USAGE
The act of closing all open file descriptors should be performed only as the first action of a daemon process. Closing file descriptors
that are in use elsewhere in the current process normally leads to disastrous results.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|MT-Level |Unsafe |
+-----------------------------+-----------------------------+
SEE ALSO
close(2), getrlimit(2), proc(4), attributes(5)
SunOS 5.11 27 Apr 2000 closefrom(3C)