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C

• c16rtomb(), c32rtomb — convert a Unicode character code to a character (restartable)
• c17 — compile standard C programs
• c32rtomb(), c16rtomb — convert a Unicode character code to a character (restartable)
• 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
• call_once() — dynamic package initialization
• 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(), posix_close — close a file descriptor
• closedir() — close a directory stream
• closelog(), openlog, setlogmask, syslog — control system log
• cmp — compare two files
• CMPLX(), CMPLXF, CMPLXL — make a complex value
• CMPLXF(), CMPLX, CMPLXL — make a complex value
• CMPLXL(), CMPLX, CMPLXF — make a complex value
• cnd_broadcast(), cnd_signal — broadcast or signal a condition
• cnd_destroy(), cnd_init — destroy and initialize condition variables
• cnd_init(), cnd_destroy — destroy and initialize condition variables
• cnd_signal(), cnd_broadcast — broadcast or signal a condition
• cnd_timedwait(), cnd_wait — wait on a condition
• cnd_wait(), cnd_timedwait — wait on a condition
• colon — null utility
• comm — select or reject lines common to two files
• command — execute a simple command
• complex.h — complex arithmetic
• compress, uncompress, zcat — compress and decompress 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() — password hashing 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)
• 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() — 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)

• 2. Conformance
• 3.57 Carriage-Return Character (<carriage-return>)
• 3.58 Character
• 3.59 Character Array
• 3.60 Character Class
• 3.61 Character Set
• 3.62 Character Special File
• 3.63 Character String
• 3.64 Child Process
• 3.65 Circumflex Character (<circumflex>)
• 3.66 Clock
• 3.67 Clock Jump
• 3.68 Clock Tick
• 3.69 Code Block
• 3.70 Coded Character Set
• 3.71 Codeset
• 3.72 Collating Element
• 3.73 Collation
• 3.74 Collation Sequence
• 3.75 Column Position
• 3.76 Command
• 3.77 Command Language Interpreter
• 3.78 Composite Graphic Symbol
• 3.79 Condition Variable
• 3.80 Connected Socket
• 3.81 Connection
• 3.82 Connection Mode
• 3.83 Connectionless Mode
• 3.84 Control Character
• 3.85 Control Operator
• 3.86 Controlling Process
• 3.87 Controlling Terminal
• 3.88 Conversion Descriptor
• 3.89 Core Image
• 3.90 CPU Time (Execution Time)
• 3.91 CPU-Time Clock
• 3.92 CPU-Time Timer
• 3.93 Current Job
• 3.94 Current Working Directory
• 3.95 Cursor Position
• 4.1 Case Insensitive Comparisons
• 4.2 Concurrent Execution
• 6. Character Set
• 6.2 Character Encoding
• 6.3 C Language Wide-Character Codes
• 6.4 Character Set Description File