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C

• c99 - compile standard C programs
• cabs(), cabsf, cabsl - return a complex absolute value
• cacos(), cacosf, cacosl - complex arc cosine functions
• cacosf() - 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
• casinf() - complex arc sine functions
• casinh(), casinhf, casinhl - complex arc hyperbolic sine functions
• casinl() - complex arc sine functions
• catan(), catanf, catanl - complex arc tangent functions
• catanf() - complex arc tangent functions
• catanh(), catanhf, catanhl - complex arc hyperbolic tangent functions
• catanl() - complex arc tangent functions
• cat - concatenate and print files
• 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
• ccosf() - 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 mode of a file
• chmod - change the file modes (Utility)
• chown() - change owner and group of a file
• chown - change the file ownership (Utility)
• cimag(), cimagf, cimagl - complex imaginary functions
• cksum - write file checksums and sizes
• clearerr() - clear indicators on a stream
• clock_getcpuclockid() - access a process CPU-time clock (ADVANCED REALTIME)
• clock_getres(), clock_gettime, clock_settime - clock and timer functions (REALTIME)
• clock_nanosleep() - high resolution sleep with specifiable clock (ADVANCED REALTIME)
• clock() - report CPU time used
• clock_settime() - clock and timer functions (REALTIME)
• clog(), clogf, clogl - 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
• connect() - connect a socket
• continue - continue for, while, or until loop
• copysign(), copysignf, copysignl - number manipulation function
• cos(), cosf, cosl - cosine function
• cosf() - cosine function
• cosh(), coshf, coshl - hyperbolic cosine functions
• cosl() - cosine function
• cp - copy files
• cpio.h - cpio archive values
• cpow(), cpowf, cpowl - complex power functions
• cproj(), cprojf, cprojl - complex projection functions
• creal(), crealf, creall - 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() - complex sine functions
• csinh(), csinhf, csinhl - complex hyperbolic sine functions
• csinl() - complex sine functions
• csplit - split files based on context
• csqrt(), csqrtf, csqrtl - complex square root functions
• ctags - create a tags file (DEVELOPMENT, FORTRAN)
• ctan(), ctanf, ctanl - complex tangent functions
• ctanf() - complex tangent functions
• ctanh(), ctanhf, ctanhl - complex hyperbolic tangent functions
• ctanl() - complex tangent functions
• ctermid() - generate a pathname for controlling terminal
• ctime(), ctime_r - convert a time value to 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)

• Carriage-Return Character (<carriage-return>)
• Character
• Character Array
• Character Class
• Character Set
• Character Set (DESCRIPTION)
• Character Special File
• Character String
• Child Process
• Circumflex
• Clock
• Clock Jump
• Clock Tick
• Coded Character Set
• Codeset
• Collating Element
• Collation
• Collation Sequence
• Column Position
• Command
• Command Language Interpreter
• Composite Graphic Symbol
• Concurrent Execution
• Condition Variable
• Conformance
• Conforming POSIX Application
• Conforming POSIX Application Using Extensions
• Conforming XSI Application Using Extensions
• Connection
• Connection Mode
• 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