FTOK(1)FTOK(1)NAMEftok - calculate System V IPC keys using the ftok(3) library function
SYNOPSISftok [ OPTION ] FILENAME ID
DESCRIPTION
Calculate a System V IPC key from the given FILENAME and ID using the
ftok(3) library function, and print the result to standard output. If
not otherwise specified, the key is printed in hexadecimal format, with
a 0x prefix.
FILENAME
The name of an existing file. This does not need to be a regular
file, directories and special files should work, too.
ID A number between (including) 0 and 255.
If shmcat has been compiled without getopt_long(3) support, only the
short, one character OPTIONs can be used. Otherwise the long ones are
also available.
OPTIONS-d, --decimal
Print the result in decimal format, without any prefix.
-h, -?, --help
Display usage information and quit without further action.
-o, --octal
Print the result in octal format and use a leading zero (0) as
prefix.
-V, --version
Show version information and quit.
EXIT CODES
0 No errors, the key was calculated and printed
1 There was an error calculating or printing the key
10 Wrong usage of the program
CAVEATS
The ftok(1) utility has the same limitations as the ftok(3) library
function. That means, there is no guarantee that the resulting key is
unique.
On Linux, passing 0 as the ID (second parameter) to the ftok(3) func‐
tion seems to work, but this behavior is unspecified. The ftok(1) tool
accepts 0 as an ID and leaves it to the library implementation on what
to do with that.
AUTHOR
Stefan Gast
SEE ALSOipcs(1), shmcat(1), ftok(3)ftok(1) September 2012 FTOK(1)
