Linux and UNIX Man Pages

Linux & Unix Commands - Search Man Pages

ffs(3) [freebsd man page]

FFS(3)							   BSD Library Functions Manual 						    FFS(3)

NAME
ffs, ffsl, ffsll, fls, flsl, flsll -- find first or last bit set in a bit string LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <strings.h> int ffs(int value); int ffsl(long value); int ffsll(long long value); int fls(int value); int flsl(long value); int flsll(long long value); DESCRIPTION
The ffs(), ffsl() and ffsll() functions find the first (least significant) bit set in value and return the index of that bit. The fls(), flsl() and flsll() functions find the last (most significant) bit set in value and return the index of that bit. Bits are numbered starting at 1, the least significant bit. A return value of zero from any of these functions means that the argument was zero. SEE ALSO
bitstring(3) HISTORY
The ffs() function appeared in 4.3BSD. Its prototype existed previously in <string.h> before it was moved to <strings.h> for IEEE Std 1003.1-2001 (``POSIX.1'') compliance. The ffsl(), fls() and flsl() functions appeared in FreeBSD 5.3. The ffsll() and flsll() functions appeared in FreeBSD 7.1. BSD
September 29, 2012 BSD

Check Out this Related Man Page

FFS(3)							     Linux Programmer's Manual							    FFS(3)

NAME
ffs, ffsl, ffsll - find first bit set in a word SYNOPSIS
#include <strings.h> int ffs(int i); #include <string.h> int ffsl(long int i); int ffsll(long long int i); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): ffs(): Since glibc 2.12: _SVID_SOURCE || _BSD_SOURCE || _POSIX_C_SOURCE >= 200809L || _XOPEN_SOURCE >= 700 || Before glibc 2.12: none ffsl(), ffsll(): _GNU_SOURCE DESCRIPTION
The ffs() function returns the position of the first (least significant) bit set in the word i. The least significant bit is position 1 and the most significant position is, for example, 32 or 64. The functions ffsll() and ffsl() do the same but take arguments of possibly different size. RETURN VALUE
These functions return the position of the first bit set, or 0 if no bits are set in i. CONFORMING TO
ffs(): 4.3BSD, POSIX.1-2001. The ffsl() and ffsll() functions are glibc extensions. NOTES
BSD systems have a prototype in <string.h>. SEE ALSO
memchr(3) COLOPHON
This page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. GNU
2010-09-20 FFS(3)
Man Page

15 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

awk command

Hi, The awk command is one of the most powerfull commands in UNIX. Can someone please explain to me how this command works and give me an example please. I do not understand this command and also the all the -Ffs and -v and -f variables that are used in this command. I never used the awk... (5 Replies)
Discussion started by: wolf
5 Replies

2. Programming

Accessing substrings by offset and length

Hi, I have a simple question... In C do we have a standard library function which will return the pointer to a substring at certain offset and having certain length... Ofcourse we should take care not to access beyond allocated length in the parent string and don't overwrite beyond allocated... (2 Replies)
Discussion started by: Vishnu
2 Replies

3. UNIX for Advanced & Expert Users

Script to Extract the line from File with specified offset

Hi All, I need to extract only XML details from large log file which may contain other unwanted junk details. For example, our xml will be start as <OUTBOUND_MESSAGE .....> and ends with </OUTBOUND_MESSAGE>. I want to extract only lines between these start and end tag (Including these tags)... (5 Replies)
Discussion started by: thinakarmani
5 Replies

4. Shell Programming and Scripting

Rsync Scripts for Offsite backups

I am currently bringing up an offsite location, right now I am in the process of copying some data offsite (about 400GB). The problem I see is that running a single rsync for everything is not using the available bandwidth and testing shows that I double in speed for each instance of Rsync I am... (3 Replies)
Discussion started by: mchasse
3 Replies

5. Shell Programming and Scripting

increment a value at an offset in hundreds very large hex file

I have a lot of very large hex files that I need to change one value at the same offset and save to another file. I have a script that finds each file and just need to put an operator for each file. I think sed might be able to do this but I have not used it before and would like some help. If... (8 Replies)
Discussion started by: Eruditass
8 Replies

6. Shell Programming and Scripting

Input 2 files, calculate diffs line by line

Hi I am new to Unix and need help with the following (to you all I'm sure) simple task. I am trying to output the differences between previous snaphots of various filesystem sizes to the present sizes. I have three files (e.g.) : file 1 file 2 file 3 10 100 /var... (4 Replies)
Discussion started by: bigbuk
4 Replies

7. AIX

Offsite Backup Solution

I'm looking for a program or some way to backup my server to another location onto another server. Does anyone have any ideas? What utility, server O/S(I would like to use Linux RH or CentOS)? Whats the best way to do this? I am fairly new with Unix. Thanks in advance (6 Replies)
Discussion started by: ITAdmin08
6 Replies

8. Shell Programming and Scripting

Get Compressed byte offset from .gz file

Hi , I have a .gz file whose contents look like below. data1^filename1 data2^filename2. .. . . Is it possible to find out the byte offset of each record from the .gz file. Like in an uncompressed file. grep -nb "Filename" give the byte offset of the record in this case. ... (4 Replies)
Discussion started by: chetan.c
4 Replies

9. UNIX for Dummies Questions & Answers

Relative column offsets

Ive been trying to slide the second column one line down while keeping the first one in place. For a start, I tried to see if I can go through every line and print the element located on the line below with the following command, but it didnt work. Maybe awk is not the right way to do it. Matlab... (6 Replies)
Discussion started by: Alabama
6 Replies

10. UNIX for Dummies Questions & Answers

NTP high offset | no servers can be used, exiting

sudo /usr/sbin/ntpdate -q nxdbsr01.paramount.com server 192.168.148.165, stratum 2, offset 45.247135, delay 0.09427 29 Jul 17:49:48 ntpdate: step time server 192.168.148.165 offset 45.247135 sec sudo /usr/sbin/ntpdate -d nxdbsr01.paramount.com 29 Jul 17:49:54 ntpdate: ntpdate... (6 Replies)
Discussion started by: stunn3r
6 Replies

11. UNIX for Advanced & Expert Users

Grep --byte-offset not returning the offset (Grep version 2.5.1)

Hi, I am trying to get the position of a repeated string in a line using grep -b -o "pattern" In my server I am using GNU grep version 2.14 and the code is working fine. However when I am deploying the same code in a different server which is using GNU grep version 2.5.1 the code is not... (3 Replies)
Discussion started by: Subhamoy
3 Replies

12. UNIX for Dummies Questions & Answers

File name offset

Dear all, I want to offset the file numbers. can you please make some awk code or linux code for the same. Example: input file names ANI_WFMASS_PIST00001.gif ANI_WFMASS_PIST00002.gif . . . ANI_WFMASS_PIST0000n.gif offset --> 30 ANI_WFMASS_PIST00031.gif ANI_WFMASS_PIST00032.gif... (14 Replies)
Discussion started by: kri321shna
14 Replies

13. Shell Programming and Scripting

Problem running zip from cron - bad zipfile offset

I've created a pretty straightforward shell script to do backups via rsync. Every night it rsyncs a copy of a website (approx 60GB) to the local machine. Once a week, after the rsync step, it zips the local copy of the whole site into 2GB chunks and places them in another folder. When running... (3 Replies)
Discussion started by: Agreppa
3 Replies

14. Shell Programming and Scripting

Selection of records y time and offset.

Gents, I have an csv file which contends value GPS time for each record and x, y coordinates.. The purpose is to identify which vps does not match with the law parameters in the relation time and offset. In the graphic attached you can see example of 3 vps which are showed in red color and... (12 Replies)
Discussion started by: jiam912
12 Replies

15. AIX

Misconfiguration detected Adapter interface name en 3 Adapter offset 0

Hi, We had a hardware problem with an IBM System p5 server, with AIX 5.2 We restore from a tape the last backup we had, but the server does not boot up as expected. The server try to mount some directories from a storage, but could not comunicate with them, we check the FC and everything is... (12 Replies)
Discussion started by: trevian3969
12 Replies