- FD_CLR - macros for synchronous I/O multiplexing
- _Exit, _exit - terminate a process
- _longjmp, _setjmp - non-local goto
- _tolower - transliterate uppercase characters to lowercase
- _toupper - transliterate lowercase characters to uppercase
- a64l, l64a - convert between a 32-bit integer and a radix-64 ASCII string
- abort - generate an abnormal process abort
- abs - return an integer absolute value
- accept - accept a new connection on a socket
- access, faccessat - determine accessibility of a file relative to directory file descriptor
- acos, acosf, acosl - arc cosine functions
- acosh, acoshf, acoshl - inverse hyperbolic cosine functions
- acosl - arc cosine functions
- admin - create and administer SCCS files (DEVELOPMENT)
- aio.h - asynchronous input and output
- aio_cancel - cancel an asynchronous I/O request
- aio_error - retrieve errors status for an asynchronous I/O operation
- aio_fsync - asynchronous file synchronization
- aio_read - asynchronous read from a file
- aio_return - retrieve return status of an asynchronous I/O operation
- aio_suspend - wait for an asynchronous I/O request
- aio_write - asynchronous write to a file
- alarm - schedule an alarm signal
- alias - define or display aliases
- alphasort, scandir - scan a directory
- ar - create and maintain library archives
- arpa/inet.h - definitions for internet operations
- asa - interpret carriage-control characters
- asctime, asctime_r - convert date and time to a string
- asin, asinf, asinl - arc sine function
- asinh, asinhf, asinhl - inverse hyperbolic sine functions
- asinl - arc sine function
- assert - insert program diagnostics
- assert.h - verify program assertion
- at - execute commands at a later time
- atan, atanf, atanl - arc tangent function
- atan2, atan2f, atan2l - arc tangent functions
- atanf - arc tangent function
- atanh, atanhf, atanhl - inverse hyperbolic tangent functions
- atanl - arc tangent function
- atexit - register a function to run at process termination
- atof - convert a string to a double-precision number
- atoi - convert a string to an integer
- atol, atoll - convert a string to a long integer
- awk - pattern scanning and processing language
- basename - return non-directory portion of a pathname
- basename - return the last component of a pathname
- batch - schedule commands to be executed in a batch queue
- bc - arbitrary-precision arithmetic language
- bg - run jobs in the background
- bind - bind a name to a socket
- bsearch - binary search a sorted table
- btowc - single byte to wide character conversion
- c99 - compile standard C programs
- cabs, cabsf, cabsl - return a complex absolute value
- cacos, cacosf, cacosl - complex arc cosine functions
- cacosh, cacoshf, cacoshl - complex arc hyperbolic cosine functions
- cacosl - complex arc cosine functions
- cal - print a calendar
- calloc - a memory allocator
- carg, cargf, cargl - complex argument functions
- casin, casinf, casinl - complex arc sine functions
- casinh, casinhf, casinhl - complex arc hyperbolic sine functions
- casinl - complex arc sine functions
- cat - concatenate and print files
- catan, catanf, catanl - complex arc tangent functions
- catanh, catanhf, catanhl - complex arc hyperbolic tangent functions
- catanl - complex arc tangent functions
- catclose - close a message catalog descriptor
- catgets - read a program message
- catopen - open a message catalog
- cbrt, cbrtf, cbrtl - cube root functions
- ccos, ccosf, ccosl - complex cosine functions
- ccosh, ccoshf, ccoshl - complex hyperbolic cosine functions
- ccosl - complex cosine functions
- cd - change the working directory
- ceil, ceilf, ceill - ceiling value function
- cexp, cexpf, cexpl - complex exponential functions
- cfgetispeed - get input baud rate
- cfgetospeed - get output baud rate
- cflow - generate a C-language flowgraph (DEVELOPMENT)
- cfsetispeed - set input baud rate
- cfsetospeed - set output baud rate
- chdir - change working directory
- chgrp - change the file group ownership
- chmod - change the file modes
- chmod, fchmodat - change mode of a file relative to directory file descriptor
- chown - change the file ownership
- chown, fchownat - change owner and group of a file relative to directory file descriptor
- cimag, cimagf, cimagl - complex imaginary functions
- cksum - write file checksums and sizes
- clearerr - clear indicators on a stream
- clock - report CPU time used
- clock_getcpuclockid - access a process CPU-time clock (ADVANCED REALTIME)
- clock_getres, clock_gettime, clock_settime - clock and timer functions
- clock_nanosleep - high resolution sleep with specifiable clock
- clock_settime - clock and timer functions
- clog, clogf, clogl - complex natural logarithm functions
- close - close a file descriptor
- closedir - close a directory stream
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