owexist(1)

1OWSHELL(1)                   One-Wire File System                   OWSHELL(1)
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NAME

6       owdir,   owread,  owwrite,  owget,  owexist,  owpresent  -  lightweight
7       owserver access
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SYNOPSIS

10   Minimal options
11       owdir -s [host:]port [directory]
12       owread -s [host:]port filepath
13       owwrite -s [host:]port filepath value
14       owget -s [host:]port [directory] | filepath
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16   Server discovery
17       owdir --autoserver [directory]
18       owread --autoserver filepath
19       owwrite --autoserver filepath value
20       owget --autoserver [directory] | filepath
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22   Full options
23       owdir -q --quiet -f --format f[.]i[[.]c] ] [  --dir  ]  -s  [host:]port
24       [directory] [directory2 ...]
25
26       owread -q --quiet -C --celsius -K --kelvin -F --fahrenheit -R --rankine
27       [ --hex ] [ --start= offset ] [ --size= bytes ] -s [host:]port filepath
28       [filepath2 ...]
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30       owwrite  -q --quiet -C --celsius -K --kelvin -F --fahrenheit -R --rank‐
31       ine [ --hex ]  [  --start=  offset  ]  -s  [host:]port  filepath  value
32       [filepath2 value2 ...]
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34       owget  -q  --quiet  -f --format f[.]i[[.]c] -C --celsius -K --kelvin -F
35       --fahrenheit -R --rankine [ --hex ] [ --start= offset ] [ --size= bytes
36       ] [ --dir ] -s [host:]port [directory] | filepath
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38   Version
39       owdir -V --version
40       owread -V --version
41       owwrite -V --version
42       owget -V --version
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44   Help
45       owdir -h | --help
46       owread -h | --help
47       owwrite -h | --help
48       owget -h | --help
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DESCRIPTION

51   1-Wire
52       1-wire is a wiring protocol and series of devices designed and manufac‐
53       tured by Dallas Semiconductor, Inc. The bus is  a  low-power  low-speed
54       low-connector scheme where the data line can also provide power.
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56       Each  device  is  uniquely and unalterably numbered during manufacture.
57       There are a wide variety of devices, including memory, sensors  (humid‐
58       ity, temperature, voltage, contact, current), switches, timers and data
59       loggers. More complex devices (like thermocouple sensors) can be  built
60       with  these  basic devices. There are also 1-wire devices that have en‐
61       cryption included.
62
63       The 1-wire scheme uses a single bus master and multiple slaves  on  the
64       same  wire.  The bus master initiates all communication. The slaves can
65       be individually discovered and addressed using their unique ID.
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67       Bus masters come in a variety of configurations including serial,  par‐
68       allel, i2c, network or USB adapters.
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70   OWFS design
71       OWFS  is  a  suite of programs that designed to make the 1-wire bus and
72       its devices easily accessible. The underlying principle is to create  a
73       virtual filesystem, with the unique ID being the directory, and the in‐
74       dividual properties of the device are represented as simple files  that
75       can be read and written.
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77       Details  of  the  individual slave or master design are hidden behind a
78       consistent interface. The goal is to provide an easy set of tools for a
79       software  designer  to create monitoring or control applications. There
80       are some performance enhancements in the implementation, including data
81       caching, parallel access to bus masters, and aggregation of device com‐
82       munication. Still the fundamental goal has been ease of use,  flexibil‐
83       ity and correctness rather than speed.
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85   OWSHELL programs
86       owdir owread owwrite and owget are collectively called the owshell pro‐
87       grams. They allow lightweight access to an owserver (1) for use in com‐
88       mand line scripts.
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90       Unlike  owserver  (1)  owhttpd  (1) owftpd (1) owhttpd (1) there is not
91       persistent connection with the 1-wire bus, no  caching  and  no  multi‐
92       threading. Instead, each program connects to a running owserver (1) and
93       performs a quick set of queries.
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95       owserver (1) performs the actual 1-wire connection (to physical  1-wire
96       buses  or  other  owserver  programs),  performs  concurrency  locking,
97       caching, and error collection.
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99       owshell programs are intended for use in command line scripts.  An  al‐
100       ternative  approach  is to mount an owfs (1) filesystem and perform di‐
101       rect file lists, reads and writes.
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103   owdir
104       owdir performs a directory listing. With no argument, all  the  devices
105       on  the  main 1-wire bus will be listed. Given the name of a 1-wire de‐
106       vice, the available properties will be listed. It is the equivalent of
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108              ls directory
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110       in the owfs (1) filesystem.
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112   owread
113       owread  obtains  for  value  of  a   1-wire   device   property.   e.g.
114       28.0080BE21AA00/temperature  gives  the  DS18B20 temperature. It is the
115       equivalent of
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117              cat filepath
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119       in the owfs (1) filesystem.
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121   owwrite
122       owwrite performs a change of a property, changing a 1-wire device  set‐
123       ting or writing to memory. It is the equivalent of
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125              echo value > filepath
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127       in the owfs (1) filesystem.
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129   owget
130       owget (1) is a convenience program, combining the function of owdir (1)
131       and owread (1) by first trying to read the argument as a directory, and
132       if that fails as a 1-wire property.
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STANDARD OPTIONS

135   --autoserver
136       Find  an owserver using the Service Discovery protocol. Essentially Ap‐
137       ple's Bonjour (aka zeroconf). Only the first owserver will be used, and
138       that choice is probably arbitrary.
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140   -s [host:]port
141       Connect via tcp (network) to an owserver process that is connected to a
142       physical 1-wire bus. This allows multiple processes to share  the  same
143       bus. The owserver process can be local or remote.
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145       If the server option is not specified, the default is the local machine
146       and the IANA allocated default port of 4304. Thus  "-s  localhost:4304"
147       is the equivalent.
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DATA OPTIONS

--hex

151       Hexadecimal mode. For reading data, each byte of character will be dis‐
152       played as two characrters 0-9ABCDEF. Most useful for reading memory lo‐
153       cations. No spaces between data.
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155       Writing  data  in  hexadecimal  mode just means that the data should be
156       given as one long hexadecimal string.
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--start=offset

159       Read or write memory locations starting at the offset byte rather  than
160       the beginning. An offset of 0 means the beginning (and is the default).
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--size=bytes

163       Read up to the specified number of bytes of a memory location.
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HELP OPTIONS

166   -h --help
167       Shows (this) basic summary of options.
168
169   -V --version
170       Version of this program.
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DISPLAY OPTIONS

173   --dir
174       Modify  the  display  of directories to indicate which entries are also
175       directories. A directory member will have a trailing '/' if it is a di‐
176       rectory itself. This aids recursive searches.
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178   -f --format f[.]i[[.]c]
179       Display  format  for  the  1-wire devices. Each device has a 8 byte ad‐
180       dress, consisting of:
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182       f      family code, 1 byte
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184       i      ID number, 6 bytes
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186       c      CRC checksum, 1 byte
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188       Possible formats are f.i (default, 01.A1B2C3D4E5F6), fi fic f.ic  f.i.c
189       and fi.c
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191       All formats are accepted as input, but the output will be in the speci‐
192       fied format.
193

EXAMPLE

195       owdir -s 3000 --format fic
196              Get the device listing (full 16 hex digits, no  dots)  from  the
197              local owserver at port 3000
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199       owread -F --autoserver 51.125499A32000/typeK/temperature
200              Read  temperature from the DS2751-based thermocouple on an auto-
201              discovered owserver Temperature in fahrenheit.
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203       owwrite -s 10.0.1.2:3001 32.000800AD23110/pages/page.1 "Passed"
204              Connect to a OWFS server process ( owserver ) that  was  started
205              on another machine at tcp port 3001 and write to the memory of a
206              DS2780
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AVAILABILITY

264       http://www.owfs.org
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AUTHOR

267       Paul Alfille (paul.alfille@gmail.com)
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271OWSHELL Manpage                      2004                           OWSHELL(1)