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- ar (1) - create and maintain library archives
- basename (1) - strip directory and suffix from filenames
- bc (1) - An arbitrary precision calculator language
- bison (1) - GNU Project parser generator (yacc replacement)
- brik (1) - calculate 32-bit CRC
- cat (1) - concatenate files and print on the standard output
- chgrp (1) - change the group ownership of files
- chmod (1) - change the access permissions of files
- chown (1) - change the user and group ownership of files
- cksum (1) - checksum and count the bytes in a file
- comm (1) - compare two sorted files line by line
- configure (1) - prepare source code to be built
- cp (1) - copy files
- cpio (1) - copy files to and from archives
- csplit (1) - split a file into sections determined by context lines
- cut (1) - remove sections from each line of files
- date (1) - print or set the system date and time
- dd (1) - convert a file while copying it
- df (1) - summarize free disk space
- dirname (1) - strip filename suffix from pathname
- du (1) - summarize disk usage
- echo (1) - display a line of text
- env (1) - run a program in a modified environment
- expand (1) - convert tabs to spaces
- expr (1) - evaluate expressions
- false (1) - do nothing, unsuccessfully
- flex (1) - fast lexical analyzer generator
- fold (1) - wrap each input line to fit in specified width
- gperf (1) - generate a perfect hash function from a key set
- groups (1) - print the groups a user is in
- gzexe (1) - compress executable files in place
- head (1) - output the first part of files
- id (1) - print real and effective UIDs and GIDs
- info (1) - GNU's hypertext system
- install (1) - copy files and set their attributes
- ispell (1) - Correct spelling for a file
- join (1) - join lines of two files on a common field
- ksh (1) - Bourne / Korn Shell (Public Domain)
- ln (1) - make links between files
- logname (1) - print user's login name
- make (1) - GNU make utility to maintain groups of programs
- mkdir (1) - make directories
- mkfifo (1) - make FIFOs (named pipes)
- mknod (1) - make special files
- mv (1) - rename files
- nice (1) - run a program with modified scheduling priority
- nl (1) - number lines of files
- nohup (1) - run a command immume to hangups, with output to a non-tty
- od (1) - dump files in octal and other formats
- paste (1) - merge lines of files
- patch (1) - apply a diff file to an original
- pathchk (1) - check whether pathnames are valid or portable
- pr (1) - convert text files for printing
- printenv (1) - print all or part of environment
- printf (1) - format and print data
- rm (1) - remove files
- rmdir (1) - remove empty directories
- sh (1) - invoke the shell command interpreter
- sleep (1) - delay for a specified amount of time
- sort (1) - sort lines of text files
- split (1) - split a file into pieces
- stty (1) - change and print terminal line settings
- su (1) - run a shell with substitute user and group IDs
- sum (1) - checksum and count the blocks in a file
- tac (1) - concatenate and print files in reverse
- tail (1) - output the last part of files
- tee (1) - read from standard input and write to standard output and files
- test (1) - check file types and compare values
- touch (1) - change file timestamps
- tr (1) - translate or delete characters
- true (1) - do nothing, successfully
- tty (1) - print the path of the terminal connected to standard input
- uname (1) - print system information
- unexpand (1) - convert spaces to tabs
- uniq (1) - remove duplicate lines from a sorted file
- wc (1) - print the number of bytes, words, and lines in files
- who (1) - show who is logged on
- whoami (1) - print effective userid
- yes (1) - output a string repeatedly until killed
- zforce (1) - force a '.gz' extension on all gzip files
- zgrep (1) - search possibly compressed files for a regular expression
- zmore (1) - file perusal filter for crt viewing of compressed text
- znew (1) - recompress .Z files to .gz files
- uuencode (1) - encode a binary file uudecode
- uudecode (1) - decode a file created by uuencode
- _exit (2) - terminate the calling process
- abort (3) - cause abnormal program termination
- abs (3) - integer absolute value function
- access (2) - check access permissions of a file or pathname
- alarm (3) - set signal timer alarm
- alloca (3) - memory allocator
- asctime, ctime, difftime, gmtime, localtime, mktime (3) - transform binary date and time value to ASCII
- atexit (3) - register a function to be called on exit
- atof (3) - convert ASCII string to double
- atoi (3) - convert ASCII string to integer
- atol (3) - convert ASCII string to long integer
- bcmp (3) - compare byte string
- bcmp, bcopy, bzero, memccpy, memchr, memcmp, memcpy, memmove, memset (3) - byte string operations
- bcopy (3) - copy byte string
- bsearch (3) - binary search of a sorted table
- bzero (3) - write zeroes to a byte string
- calloc (3) - allocate clean memory (zero initialized space)
- chdir, fchdir (2) - change current working directory
- chmod, fchmod (2) - change mode of file
- clearerr, feof, ferror, fileno (3) - check and reset stream status
- clock (3) - determine processor time used
- close (2) - delete a descriptor
- creat (2) - create a new file
- crypt, setkey, encrypt, des_setkey, des_cipher (3) - DES encryption
- ctermid (3) - generate terminal pathname
- curses (3) - screen functions with ``optimal'' cursor motion
- div (3) - return quotient and remainder from division
- dup, dup2 (2) - duplicate an existing file descriptor
- execl, execlp, execle, exect, execv, execvp (3) - execute a file
- execve (2) - execute a file
- exit (3) - perform normal program termination
- fclose (3) - close a stream
- fcntl (2) - file control
- fflush, fpurge (3) - flush a stream
- ffs (3) - find first bit set in a bit string
- fgetc, getc, getchar, getw (3) - get next character or word from input stream
- fgetline (3) - get a line from a stream
- fgetpos, fseek, fsetpos, ftell, rewind (3) - reposition a stream
- fgets, gets (3) - get a line from a stream
- fnmatch (3) - match filename or pathname
- fopen, fdopen, freopen (3) - stream open functions
- fputc, putc, putchar, putw (3) - output a character or word to a stream
- fputs, puts (3) - output a line to a stream
- fread, fwrite (3) - binary stream input/output
- free (3) - free up memory allocated with malloc, calloc or realloc
- frexp (3) - convert floatingpoint number to fractional and integral compo nents
- fsync (2) - synchronize a file's incore state with that on disk
- fts (3) - traverse a file hierarchy
- funopen, fropen, fwopen (3) - open a stream
- getdtablesize (2) - get descriptor table size
- getenv, putenv, setenv, unsetenv (3) - environment variable functions
- getfsent, getfsspec, getfsfile, setfsent, endfsent (3) - get file system descriptor file entry
- getfsstat (2) - get list of all mounted filesystems
- getgid, getegid (2) - get group process identification
- getgrent, getgrnam, getgrgid, setgroupent, setgrent, endgrent (3) - group database operations
- getgroups (2) - get group access list
- gethostname, sethostname (2) - get/set name of current host
- getitimer, setitimer (2) - get/set value of interval timer
- getlogin, setlogin (2) - get/set login name
- getmntinfo (3) - get information about mounted file systems
- getmode, setmode (3) - modify mode bits
- getopt (3) - get option letter from argv
- getpagesize (2) - get system page size
- getpass (3) - get a password
- getpgrp (2) - get process group
- getpid, getppid (2) - get parent or calling process identification
- getpriority, setpriority (2) - get/set program scheduling priority
- getpwent, getpwnam, getpwuid, setpassent, setpwent, endpwent (3) - password database operations
- getrlimit, setrlimit (2) - control maximum system resource consumption
- getrusage (2) - get information about resource utilization
- getsubopt (3) - get sub options from an argument
- gettimeofday, settimeofday (2) - get/set date and time
- getuid, geteuid (2) - get user identification
- getwd (3) - get working directory pathname
- glob, globfree (3) - generate pathnames matching a pattern
- index (3) - locate character in string
- initgroups (3) - initialize group access list
- intro (2) - introduction to system calls and error numbers
- ioctl (2) - control device
- isalnum (3) - alphanumeric character test
- isalpha (3) - alphabetic character test
- isalpha, isupper, islower, isdigit, isxdigit, isalnum, isspace, ispunct, isprint, isgraph, iscntrl, isascii, toupper, tolower, toascii (3) - character classification macros
- iscntrl (3) - control character test
- isdigit (3) - decimaldigit character test
- isgraph (3) - printing character test (space character exculsive)
- isinf, isnan (3) - test for infinity or notanumber (NaN)
- islower (3) - lowercase character test
- isprint (3) - printing character test (space character inclusive)
- ispunct (3) - punctuation character test
- isspace (3) - whitespace character test
- isupper (3) - uppercase character test
- isxdigit (3) - hexadecimaldigit character test
- kill (2) - send signal to a process
- killpg (2) - send signal to a process group
- labs (3) - return the absolute value of a long integer
- ldexp (3) - mutliply floatingpoint number by integral power of 2
- ldiv (3) - return quotient and remainder from division
- link (2) - make a hard file link
- lseek (2) - reposition read/write file offset
- malloc, (3) - general memory allocation function
- malloc, free, realloc, calloc, alloca (3) - general memory allocation operations
- man.conf (5) - configuration file for man(1)
- memchr (3) - locate byte in byte string
- memcmp (3) - compare byte string
- memcpy (3) - copy byte string
- memmove (3) - copy byte string
- memset (3) - write a byte to byte string
- mkdir (2) - make a directory file
- mktemp (3) - make temporary file name (unique)
- modf (3) - extract signed integral and fractional values from floatingpoint number
- nice (3) - set program scheduling priority
- nlist (3) - retrieve symbol table name list from an executable file
- open (2) - open or create a file for reading or writing
- opendir, readdir, telldir, seekdir, rewinddir, closedir, dirfd (3) - directory operations
- pause (3) - stop until signal
- perror, strerror, sys_errlist, sys_nerr (3) - system error messages
- pipe (2) - create descriptor pair for interprocess communication
- popen, pclose (3) - process I/O
- printf, fprintf, sprintf, snprintf, vprintf, vfprintf, vsprintf, vsnprintf (3) - formatted output conversion
- psignal, sys_siglist (3) - system signal messages
- qsort, heapsort (3) - sort functions
- radixsort (3) - radix sort
- raise (3) - send a signal to the current process
- rand, srand (3) - bad random number generator
- random, srandom, initstate, setstate (3) - better random number generator; routines for changing generators
- read, readv (2) - read input
- readlink (2) - read value of a symbolic link
- realloc (3) - reallocation of memory function
- regcomp, regexec, regsub, regerror (3) - regular expression handlers
- remove (3) - remove directory entry
- rename (2) - change the name of a file
- rindex (3) - locate character in string
- rmdir (2) - remove a directory file
- scandir, alphasort (3) - scan a directory
- scanf, fscanf, sscanf, vscanf, vsscanf, vfscanf (3) - input format conversion
- select (2) - synchronous I/O multiplexing
- setbuf, setbuffer, setlinebuf, setvbuf (3) - stream buffering operations
- setgroups (2) - set group access list
- setpgid, setpgrp (2) - set process group
- setregid (2) - set real and effective group ID
- setreuid (2) - set real and effective user ID's
- setuid, seteuid, setruid, setgid, setegid, setrgid (3) - set user and group ID
- sigaction (2) - software signal facilities
- sigblock (2) - block signals
- siginterrupt (3) - allow signals to interrupt system calls
- signal (3) - simplified software signal facilities
- sigpause (2) - atomically release blocked signals and wait for interrupt
- sigprocmask (2) - manipulate current signal mask
- sigreturn (2) - return from signal
- sigsetjmp, siglongjmp, setjmp, longjmp, _setjmp, _longjmp longjmperror (3) - nonlocal jumps
- sigsetmask (2) - set current signal mask
- sigsetops, sigemptyset, sigfillset, sigaddset, sigdelset, sigismember (3) - manipulate signal masks
- sigstack (2) - set and/or get signal stack context
- sigsuspend (2) - atomically release blocked signals and wait for interrupt
- sigvec (2) - software signal facilities
- sleep (3) - suspend process execution for interval of seconds
- stat, lstat, fstat (2) - get file status
- statfs (2) - get file system statistics
- stdio (3) - standard input/output library functions
- strcasecmp (3) - compare strings, ignoring case
- strcat (3) - concatenate strings
- strcat, strncat, strchr, strrchr, strcmp, strncmp, strcasecmp, strncasecmp, strcpy, strncpy, strerror, strlen, strpbrk, strsep, strspn, strcspn, strstr, strtok, index, rindex (3) - string specific functions
- strchr (3) - locate character in string
- strcmp (3) - compare strings
- strcoll (3) - compare strings according to current collation
- strcpy (3) - copy strings
- strcspn (3) - span the complement of a string
- strdup (3) - save a copy of a string
- strftime (3) - format date and time
- strlen (3) - find length of string
- strmode (3) - convert inode status information into a symbolic string
- strpbrk (3) - locate multiple characters in string
- strrchr (3) - locate character in string
- strsep (3) - separate strings
- strspn (3) - span a string
- strstr (3) - locate a substring in a string
- strtod (3) - convert ASCII string to double
- strtok, strsep (3) - string token operations
- strtol (3) - convert string value to a long integer
- strtoul (3) - convert a string to an unsigned long integer
- strxfrm (3) - transform a string under locale
- swab (3) - swap adjacent bytes
- symlink (2) - make symbolic link to a file
- syscall (2) - indirect system call
- system (3) - pass a command to the shell
- tempnam, tmpfile, tmpnam (3) - temporary file routines
- tgetent, tgetnum, tgetflag, tgetstr, tgoto, tputs (3) - terminal independent operation routines
- time (3) - get time of day
- times (3) - process times
- timezone (3) - return the timezone abbreviation
- tolower (3) - upper case to lower case letter conversion
- toupper (3) - lower case to upper case letter conversion
- truncate (2) - truncate a file to a specified length
- ttyname, isatty, ttyslot (3) - get name of associated terminal (tty) from file descriptor
- tzset, tzsetwall (3) - initialize time conversion information
- ualarm (3) - schedule signal after specified time
- ungetc (3) - unget character from input stream
- unlink (2) - remove directory entry
- unvis, strunvis (3) - decode a visual representation of characters
- usleep (3) - suspend execution for interval of microseconds
- utime (3) - set file times
- utimes (2) - set file access and modification times
- valloc (3) - aligned memory allocation function
- vfork (2) - spawn new process in a virtual memory efficient way
- vis (3) - visually encode characters
- wait, waitpid, wait4, wait3 (2) - wait for process terminatation
- write, writev (2) - write output
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