The Open Group Base Specifications Issue 7
IEEE Std 1003.1-2008, 2016 Edition
Copyright © 2016 The IEEE and The Open Group, All Rights reserved.

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### C

- c99 - compile standard C programs
- cabs(), cabsf, cabsl - return a complex absolute value
- cabsf(), cabs, cabsl - return a complex absolute value
- cabsl(), cabs, cabsf - return a complex absolute value
- cacos(), cacosf, cacosl - complex arc cosine functions
- cacosf(), cacos, cacosl - complex arc cosine functions
- cacosh(), cacoshf, cacoshl - complex arc hyperbolic cosine functions
- cacoshf(), cacosh, cacoshl - complex arc hyperbolic cosine functions
- cacoshl(), cacosh, cacoshf - complex arc hyperbolic cosine functions
- cacosl(), cacos, cacosf - complex arc cosine functions
- cal - print a calendar
- calloc() - a memory allocator
- carg(), cargf, cargl - complex argument functions
- cargf(), carg, cargl - complex argument functions
- cargl(), carg, cargf - complex argument functions
- casin(), casinf, casinl - complex arc sine functions
- casinf(), casin, casinl - complex arc sine functions
- casinh(), casinhf, casinhl - complex arc hyperbolic sine functions
- casinhf(), casinh, casinhl - complex arc hyperbolic sine functions
- casinhl(), casinh, casinhf - complex arc hyperbolic sine functions
- casinl(), casin, casinf - complex arc sine functions
- cat - concatenate and print files
- catan(), catanf, catanl - complex arc tangent functions
- catanf(), catan, catanl - complex arc tangent functions
- catanh(), catanhf, catanhl - complex arc hyperbolic tangent functions
- catanhf(), catanh, catanhl - complex arc hyperbolic tangent functions
- catanhl(), catanh, catanhf - complex arc hyperbolic tangent functions
- catanl(), catan, catanf - 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
- cbrtf(), cbrt, cbrtl - cube root functions
- cbrtl(), cbrt, cbrtf - cube root functions
- ccos(), ccosf, ccosl - complex cosine functions
- ccosf(), ccos, ccosl - complex cosine functions
- ccosh(), ccoshf, ccoshl - complex hyperbolic cosine functions
- ccoshf(), ccosh, ccoshl - complex hyperbolic cosine functions
- ccoshl(), ccosh, ccoshf - complex hyperbolic cosine functions
- ccosl(), ccos, ccosf - complex cosine functions
- cd - change the working directory
- ceil(), ceilf, ceill - ceiling value function
- ceilf(), ceil, ceill - ceiling value function
- ceill(), ceil, ceilf - ceiling value function
- cexp(), cexpf, cexpl - complex exponential functions
- cexpf(), cexp, cexpl - complex exponential functions
- cexpl(), cexp, cexpf - 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
- chown - change the file ownership
- chown(), fchownat - change owner and group of a file
- cimag(), cimagf, cimagl - complex imaginary functions
- cimagf(), cimag, cimagl - complex imaginary functions
- cimagl(), cimag, cimagf - 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_gettime(), clock_getres, clock_settime - clock and timer functions
- clock_nanosleep() - high resolution sleep with specifiable clock
- clock_settime(), clock_getres, clock_gettime - clock and timer functions
- clog(), clogf, clogl - complex natural logarithm functions
- clogf(), clog, clogl - complex natural logarithm functions
- clogl(), clog, clogf - complex natural logarithm functions
- close() - close a file descriptor
- closedir() - close a directory stream
- closelog(), openlog, setlogmask, syslog - control system log
- cmp - compare two files
- colon - null utility
- comm - select or reject lines common to two files
- command - execute a simple command
- complex.h - complex arithmetic
- compress - compress data
- confstr() - get configurable variables
- conj(), conjf, conjl - complex conjugate functions
- conjf(), conj, conjl - complex conjugate functions
- conjl(), conj, conjf - complex conjugate functions
- connect() - connect a socket
- continue - continue for, while, or until loop
- copysign(), copysignf, copysignl - number manipulation function
- copysignf(), copysign, copysignl - number manipulation function
- copysignl(), copysign, copysignf - number manipulation function
- cos(), cosf, cosl - cosine function
- cosf(), cos, cosl - cosine function
- cosh(), coshf, coshl - hyperbolic cosine functions
- coshf(), cosh, coshl - hyperbolic cosine functions
- coshl(), cosh, coshf - hyperbolic cosine functions
- cosl(), cos, cosf - cosine function
- cp - copy files
- cpio.h - cpio archive values
- cpow(), cpowf, cpowl - complex power functions
- cpowf(), cpow, cpowl - complex power functions
- cpowl(), cpow, cpowf - complex power functions
- cproj(), cprojf, cprojl - complex projection functions
- cprojf(), cproj, cprojl - complex projection functions
- cprojl(), cproj, cprojf - complex projection functions
- creal(), crealf, creall - complex real functions
- crealf(), creal, creall - complex real functions
- creall(), creal, crealf - complex real functions
- creat() - create a new file or rewrite an existing one
- crontab - schedule periodic background work
- crypt() - string encoding function (CRYPT)
- csin(), csinf, csinl - complex sine functions
- csinf(), csin, csinl - complex sine functions
- csinh(), csinhf, csinhl - complex hyperbolic sine functions
- csinhf(), csinh, csinhl - complex hyperbolic sine functions
- csinhl(), csinh, csinhf - complex hyperbolic sine functions
- csinl(), csin, csinf - complex sine functions
- csplit - split files based on context
- csqrt(), csqrtf, csqrtl - complex square root functions
- csqrtf(), csqrt, csqrtl - complex square root functions
- csqrtl(), csqrt, csqrtf - complex square root functions
- ctags - create a tags file (DEVELOPMENT, FORTRAN)
- ctan(), ctanf, ctanl - complex tangent functions
- ctanf(), ctan, ctanl - complex tangent functions
- ctanh(), ctanhf, ctanhl - complex hyperbolic tangent functions
- ctanhf(), ctanh, ctanhl - complex hyperbolic tangent functions
- ctanhl(), ctanh, ctanhf - complex hyperbolic tangent functions
- ctanl(), ctan, ctanf - complex tangent functions
- ctermid() - generate a pathname for the controlling terminal
- ctime(), ctime_r - convert a time value to a date and time string
- ctime_r(), ctime - convert a time value to a date and time string
- ctype.h - character types
- cut - cut out selected fields of each line of a file
- cxref - generate a C-language program cross-reference table (DEVELOPMENT)

Topics

- C Language Wide-Character Codes
- Carriage-Return Character (<carriage-return>)
- Character Array
- Character Class
- Character Encoding
- Character Set Description File
- Character Set
- Character Set
- Character Special File
- Character String
- Character
- Child Process
- Circumflex Character (<circumflex>)
- Clock Jump
- Clock Tick
- Clock
- Coded Character Set
- Codeset
- Collating Element
- Collation Sequence
- Collation
- Column Position
- Command Language Interpreter
- Command
- Composite Graphic Symbol
- Concurrent Execution
- Condition Variable
- Conformance
- Connected Socket
- Connection Mode
- Connection
- Connectionless Mode
- Control Character
- Control Operator
- Controlling Process
- Controlling Terminal
- Conversion Descriptor
- Core File
- CPU Time (Execution Time)
- CPU-Time Clock
- CPU-Time Timer
- Current Job
- Current Working Directory
- Cursor Position