Visit Our UNIX and Linux User Community

Linux and UNIX Man Pages

Test Your Knowledge in Computers #385
Difficulty: Easy
The Linux uptime command show how long the hard drive has been powered down.
True or False?
Linux & Unix Commands - Search Man Pages

ffs(3) [bsd man page]

BSTRING(3)						     Library Functions Manual							BSTRING(3)

NAME
bcopy, bcmp, bzero, ffs - bit and byte string operations SYNOPSIS
bcopy(src, dst, length) char *src, *dst; int length; bcmp(b1, b2, length) char *b1, *b2; int length; bzero(b, length) char *b; int length; ffs(i) long i; DESCRIPTION
The functions bcopy, bcmp, and bzero operate on variable length strings of bytes. They do not check for null bytes as the routines in string(3) do. Bcopy copies length bytes from string src to the string dst. Bcmp compares byte string b1 against byte string b2, returning zero if they are identical, non-zero otherwise. Both strings are assumed to be length bytes long. Bzero places length 0 bytes in the string b1. Ffs find the first bit set in the argument passed it and returns the index of that bit. Bits are numbered starting at 1. A return value of 0 indicates the value passed is zero. BUGS
The bcopy routine take parameters backwards from strcpy. 4.2 Berkeley Distribution May 15, 1985 BSTRING(3)

Check Out this Related Man Page

BSTRING(3)						   BSD Library Functions Manual 						BSTRING(3)

NAME
bcmp, bcopy, bzero, memccpy, memchr, memcmp, memcpy, memmove, memset -- byte string operations LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <strings.h> int bcmp(const void *s1, const void *s2, size_t n); void bcopy(const void *s1, void *s2, size_t n); void bzero(void *s, size_t n); #include <string.h> void * memccpy(void *restrict s1, const void *restrict s2, int c, size_t n); void * memchr(const void *s, int c, size_t n); int memcmp(const void *s1, const void *s2, size_t n); void * memcpy(void *restrict s1, const void *restrict s2, size_t n); void * memmove(void *s1, const void *s2, size_t n); void * memset(void *s, int c, size_t n); DESCRIPTION
These functions operate on variable length strings of bytes. They do not check for terminating null bytes, as the routines listed in string(3) do. See the specific manual pages for more information. LEGACY SYNOPSIS
#include <string.h> The include file <string.h> is necessary and sufficient for all functions. SEE ALSO
bcmp(3), bcopy(3), bzero(3), memccpy(3), memchr(3), memcmp(3), memcpy(3), memmove(3), memset(3), compat(5) STANDARDS
The functions memchr(), memcmp(), memcpy(), memmove(), and memset() conform to ISO/IEC 9899:1990 (``ISO C90''). HISTORY
The functions bzero() and memccpy() appeared in 4.3BSD; the functions bcmp(), bcopy(), appeared in 4.2BSD. BSD
June 4, 1993 BSD

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

Featured Tech Videos