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S

• sact - print current SCCS file-editing activity (DEVELOPMENT)
• savetty - save terminal mode
• sbrk - change space allocation
• scalb - load exponent of a radix-independent floating-point number
• scanf - convert formatted input
• scanw - convert formatted input from the current window
• sccs - front end for the SCCS subsystem (DEVELOPMENT)
• sched.h - execution scheduling
• sched_get_priority_max, sched_get_priority_min - get priority limits
• sched_getparam - get scheduling parameters
• sched_getscheduler - get scheduling policy
• sched_rr_get_interval - get execution time limits
• sched_setparam - set scheduling parameters
• sched_setscheduler - set scheduling policy and parameters
• sched_yield - yield processor
• scr_dump, scr_init, scr_restore, scr_set
• scrl, scroll, wscrl - scroll a Curses window
• scrollok - enable or disable scrolling on a window
• search.h - search tables
• sed - stream editor
• seed48 - seed uniformly distributed pseudo-random non-negative
• seekdir - set position of directory stream
• select - synchronous I/O multiplexing (XNS)
• select - synchronous I/O multiplexing
• sem_close - close a named semaphore
• sem_destroy - destroy an unnamed semaphore
• sem_getvalue - get the value of a semaphore
• sem_init - initialise an unnamed semaphore
• sem_open - initialise and open a named semaphore
• sem_post - unlock a semaphore
• sem_unlink - remove a named semaphore
• sem_wait, sem_trywait - lock a semaphore
• semaphore.h - semaphores
• semctl - semaphore control operations
• semget - get set of semaphores
• semop - semaphore operations
• send - send a message on a socket
• sendmsg - send a message on a socket using a message structure
• sendto - send a message on a socket
• set - Set or Unset Options and Positional Parameters (Shell Built-in)
• set_curterm - set current terminal
• set_term - switch between screens
• setbuf - assign buffering to a stream
• setcchar - set cchar_t from a wide character string and rendition
• setcontext - set current user context
• setgid - set-group-ID
• setgrent - reset group database to first entry
• sethostent - network host database function
• setitimer - set value of interval timer
• setjmp - set jump point for a non-local goto
• setjmp.h - stack environment declarations
• setkey - set encoding key
• setlocale - set program locale
• setlogmask - set log priority mask
• setnetent - network database function
• setpgid - set process group ID for job control
• setpgrp - set process group ID
• setpriority - set the nice value
• setprotoent - network protocol database function
• setpwent - user database function
• setregid - set real and effective group IDs
• setreuid - set real and effective user IDs
• setrlimit - control maximum resource consumption
• setscrreg, wsetscrreg - define software scrolling region
• setservent - network services database function
• setsid - create session and set process group ID
• setsockopt - set the socket options
• setstate - switch pseudorandom number generator state arrays
• setuid - set-user-ID
• setupterm - access the terminfo database
• setutxent - reset user accounting database to first entry
• setvbuf - assign buffering to a stream
• sh - shell, the standard command language interpreter
• shift - Shift Positional Parameters (Shell Built-in)
• shm_open - open a shared memory object
• shm_unlink - remove a shared memory object
• shmat - shared memory attach operation
• shmctl - shared memory control operations
• shmdt - shared memory detach operation
• shmget - get shared memory segment
• shutdown - shut down socket send and receive operations
• sigaction - examine and change signal action
• sigaddset - add a signal to a signal set
• sigaltstack - set and/or get signal alternate stack context.
• sigdelset - delete a signal from a signal set
• sigemptyset - initialise and empty a signal set
• sigfillset - initialise and fill a signal set
• sighold, sigignore - add a signal to the signal mask or set a
• siginterrupt - allow signals to interrupt functions
• sigismember - test for a signal in a signal set
• siglongjmp - non-local goto with signal handling
• signal, sigset, sighold, sigrelse, sigignore, sigpause - signal management
• signal.h - signals
• signgam - storage for sign of lgamma()
• sigpause - remove a signal from the signal mask and suspend the thread
• sigpending - examine pending signals
• sigprocmask, pthread_sigmask - examine and change blocked signals
• sigqueue - queue a signal to a process
• sigrelse, sigset - remove a signal from signal mask or modify
• sigsetjmp - set jump point for a non-local goto
• sigstack - set and/or get alternate signal stack context
• sigsuspend - wait for a signal
• sigwait - wait for queued signals
• sigwaitinfo, sigtimedwait - wait for queued signals
• sin - sine function
• sinh - hyperbolic sine function
• sleep - suspend execution for an interval of time
• slk_attroff, slk_attr_off,
• socket - create an endpoint for communication
• socketpair - create a pair of connected sockets
• sort - sort, merge or sequence check text files
• spell - find spelling errors (LEGACY)
• split - split files into pieces
• sprintf, snprintf - print formatted output
• sqrt - square root function
• srand - seed simple pseudo-random number generator
• srand48 - seed uniformly distributed double-precision
• srandom - seed pseudorandom number generator
• sscanf - convert formatted input
• standend, standout, wstandend, wstandout
• start_color - initialise use of colours on terminal
• stat - get file status
• statvfs - get file system information
• stdarg.h - handle variable argument list
• stddef.h - standard type definitions
• stderr, stdin, stdout - standard I/O streams
• stdio.h - standard buffered input/output
• stdlib.h - standard library definitions
• stdscr - default window
• step - pattern match with regular expressions
• strcasecmp, strncasecmp - case-insensitive string comparisons
• strcat - concatenate two strings
• strchr - string scanning operation
• strcmp - compare two strings
• strcoll - string comparison using collating information
• strcpy - copy a string
• strcspn - get length of a complementary substring
• strdup - duplicate a string
• strerror - get error message string
• strfmon - convert monetary value to a string
• strftime - convert date and time to a string
• string.h - string operations
• strings - find printable strings in files
• strings - string operations
• strip - remove unnecessary information from executable files
• strlen - get string length
• strncasecmp - case-insensitive string comparison
• strncat - concatenate part of two strings
• strncmp - compare part of two strings
• strncpy - copy part of a string
• stropts.h - STREAMS interface
• strpbrk - scan string for byte
• strptime - date and time conversion
• strrchr - string scanning operation
• strspn - get length of a substring
• strstr - find a substring
• strtod - convert string to a double-precision number
• strtok, strtok_r - split string into tokens
• strtol - convert string to a long integer
• strtoul - convert string to an unsigned long
• strxfrm - string transformation
• stty - set the options for a terminal
• subpad - create a subwindow in a pad
• subwin - create a subwindow
• sum - print checksum and block count of a file (LEGACY)
• swab - swap bytes
• swapcontext - swap user context
• swprintf - print formatted wide-character output
• swscanf - convert formatted wide-character input
• symlink - make symbolic link to a file
• sync - schedule filesystem updates
• syncok, wcursyncup, wsyncdown, wsyncup - synchronise a window with its
• sys/ipc.h - interprocess communication access structure
• sys/mman.h - memory management declarations
• sys/msg.h - message queue structures
• sys/resource.h - definitions for XSI resource operations
• sys/sem.h - semaphore facility
• sys/shm.h - shared memory facility
• sys/socket.h - Internet Protocol family
• sys/stat.h - data returned by the stat function
• sys/stat.h - data returned by the stat() function. (XNS)
• sys/statvfs.h - VFS Filesystem information structure
• sys/time.h - time types
• sys/timeb.h - additional definitions for date and time
• sys/times.h - file access and modification times structure
• sys/types.h - data types
• sys/uio.h - definitions for scatter/gather I/O (XNS)
• sys/uio.h - definitions for vector I/O operations
• sys/un.h - definitions for UNIX-domain sockets
• sys/utsname.h - system name structure
• sys/wait.h - declarations for waiting
• sysconf - get configurable system variables
• syslog - definitions for system error logging
• syslog - log a message
• system - issue a command

• Shell Command Language
• Standard I/O streams
• STREAMS