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| qsort Subroutine | Sorts a table of data in place. |
| quotactl Subroutine | Manipulates disk quotas. |
| raise Subroutine | Sends a signal to the currently running program. |
| rand Subroutine | Generates pseudo-random numbers. |
| random Subroutine | Generates pseudo-random numbers more efficiently. |
| rand_r Subroutine | Generates pseudo-random numbers. |
| raw Subroutine | Puts the terminal into or out of CBREAK mode. |
| read Subroutine | Reads from a file. |
| readdir Subroutine | Performs operations on directories. |
| readdir_r Subroutine | Reads a directory. |
| readlink Subroutine | Reads the contents of a symbolic link. |
| read_real_time Subroutine | Read the processor real time clock or time base registers to obtain high-resolution elapsed time. |
| readv Subroutine | Reads from a file. |
| readvx Subroutine | Reads from a file. |
| readx Subroutine | Reads from a file. |
| realloc Subroutine | Provides a memory allocator. |
| realpath Subroutine | Resolves path names. |
| reboot Subroutine | Restarts the system. |
| re_comp Subroutine | Regular expression handler. |
| re_exec Subroutine | Regular expression handler. |
| refresh Subroutine | Refreshes windows and lines. |
| regcmp Subroutine | Compiles and matches regular-expression patterns. |
| regcomp Subroutine | Compiles a specified basic or extended regular expression into an executable string. |
| regerror Subroutine | Returns a string that describes the ErrCode parameter. |
| regex Subroutine | Compiles and matches regular-expression patterns. |
| regexec Subroutine | Compares the null-terminated string specified by the value of the String parameter against the compiled basic or extended regular expression Preg, which must have previously been compiled by a call to the regcomp subroutine. |
| regfree Subroutine | Frees any memory allocated by the regcomp subroutine associated with the Preg parameter. |
| reltimerid Subroutine | Releases a previously allocated interval timer. |
| remainder Subroutine | Computes the IEEE Remainder as defined in the IEEE Floating-Point Standard. |
| __remap Subroutine | Remap 64-bit addresses into 32-bit addresses. |
| __remap_identity Subroutine | Remaps 64-bit addresses into 32-bit addresses. |
| remove Subroutine | Removes a file. |
| remque Subroutine | Inserts or removes an element in a queue. |
| rename Subroutine | Renames a directory or a file. |
| resabs Subroutine | Manipulates the expiration time of interval timers. |
| reset_prog_mode Subroutine | Saves/restores the program or shell terminal modes. |
| reset_shell_mode Subroutine | Saves/restores the program or shell terminal modes. |
| reset_speed Subroutine | Set and get the terminal baud rate. |
| resetterm Subroutine | Resets terminal modes to what they were when the saveterm subroutine was last called. |
| resetty Subroutine | Saves/restores the terminal mode. |
| resinc Subroutine | Manipulates the expiration time of interval timers. |
| restartterm Subroutine | Interfaces to the terminfo database. |
| restimer Subroutine | Gets or sets the current value for the specified systemwide timer. |
| revoke Subroutine | Revokes access to a file. |
| rewind Subroutine | Repositions the file pointer of a stream. |
| rewinddir Subroutine | Performs operations on directories. |
| rint Subroutine | Rounds floating-point numbers to floating-point integer values. |
| ripoffline Subroutine | Reserves a line for a dedicated purpose. |
| rmdir Subroutine | Removes a directory. |
| rpmatch Subroutine | Determines whether the response to a question is affirmative or negative. |
| rpow Subroutine | Multiple-precision integer arithmetic. |
| rsqrt Subroutine | Computes the reciprocal of the square root of a number. |
| rstat Subroutine | Gets performance data from remote kernels. |
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