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mkfifo(1) General Commands Manual mkfifo(1) NAME mkfifo - Makes FIFO special files SYNOPSIS mkfifo [-m mode] file... The mkfifo utility creates FIFO special files in the order specified. STANDARDS Interfaces documented on this reference page conform to industry stan- dards as follows: mkfifo: XPG4, XPG4-UNIX Refer to the standards(5) reference page for more information about in- dustry standards and associated tags. OPTIONS Sets the file permission bits of the new file to the specified mode value, after creating the FIFO special file. The mode argument is a symbolic mode string (see chmod), in which the operator characters + (plus sign) and - (minus) are interpreted relative to the default file mode for that file type. The + character adds permissions to the de- fault mode, and - deletes permissions from the default mode. [DIGITAL] The default mode is a=rw (permissions of rw-rw-rw) as modified by the current file mode creation mask (umask). OPERANDS The path name of a FIFO special file to be created. DESCRIPTION For each file argument, mkfifo performs actions equivalent to the mk- fifo() call with the following arguments: The file argument is used as the pathname argument. If the -m option is not used, the value of the bitwise inclusive OR of S_IRUSR, S_IWUSR, S_IRGRP, S_IWGRP, S_IROTH, and S_IWOTH is used as the mode argument. EXIT STATUS The mkfifo utility exits with one of the following values: Indicates that all the specified FIFO special files were created successfully. Indicates that an error occurred. EXAMPLES To create a FIFO special file with permissions prw-r--r--, enter: mk- fifo -m 644 /tmp/myfifo The command creates the /tmp/myfifo file with read/write permis- sions for the owner and read permission for the group and for others. To create a FIFO special file using the - (minus) operand to set permissions of prw-r-----, enter: mkfifo -m g- w,o-rw /tmp/fifo2 The command creates the /tmp/fifo2 file, removing write permis- sion for the group and all permissions for others. ENVIRONMENT VARIABLES The following environment variables affect the execution of mkfifo: Provides a default value for the internationalization variables that are unset or null. If LANG is unset or null, the corresponding value from the default locale is used. If any of the internationalization variables contain an invalid setting, the utility behaves as if none of the variables had been defined. If set to a non-empty string value, overrides the values of all the other internationalization variables. Determines the locale for the interpretation of sequences of bytes of text data as characters (for example, single-byte as opposed to multi- byte characters in arguments). Determines the locale for the format and contents of diagnostic messages written to standard error. Deter- mines the location of message catalogues for the processing of LC_MES- SAGES. SEE ALSO Commands: mkdir(1), mknod(8) Functions: chmod(2), mkdir(2), mkfifo(3), mknod(2), umask(2) Standards: standards(5) mkfifo(1)