The Linux Manuals (man pages) document is an important part of Linux documents. Linux Manuals are organized as several sections. Each section has a group of commands for a specific area in Linux usage, administration or development.
NAME bpf – perform a command on an extended BPF map or program SYNOPSIS #include <linux/bpf.h> int bpf(int cmd, union bpf_attr *attr, unsigned int size); DESCRIPTION The bpf() system call performs a range of operations related to extended Berkeley Packet Filters. Extended BPF (or eBPF) is similar to the original ("classic") BPF (cBPF) used to…
NAME bdflush – start, flush, or tune buffer-dirty-flush daemon SYNOPSIS #include <sys/kdaemon.h> int bdflush(int func, long *address); int bdflush(int func, long data); DESCRIPTION Note: Since Linux 2.6, this system call is deprecated and does nothing. It is likely to disappear altogether in a future kernel release. Nowadays, the task performed by bdflush() is handled by…
NAME sync_file_range – sync a file segment with disk SYNOPSIS #define _GNU_SOURCE /* See feature_test_macros(7) */ #include <fcntl.h> int sync_file_range(int fd, off64_t offset, off64_t nbytes, unsigned int flags); DESCRIPTION sync_file_range() permits fine control when synchronizing the open file referred to by the file descriptor fd with disk. offset is the starting byte of the file…
NAME posix_fadvise – predeclare an access pattern for file data SYNOPSIS #include <fcntl.h> int posix_fadvise(int fd, off_t offset, off_t len, int advice); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): posix_fadvise(): _POSIX_C_SOURCE >= 200112L DESCRIPTION Programs can use posix_fadvise() to announce an intention to access file data in a specific pattern in the future, thus allowing the…
NAME posix_fadvise – predeclare an access pattern for file data SYNOPSIS #include <fcntl.h> int posix_fadvise(int fd, off_t offset, off_t len, int advice); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): posix_fadvise(): _POSIX_C_SOURCE >= 200112L DESCRIPTION Programs can use posix_fadvise() to announce an intention to access file data in a specific pattern in the future, thus allowing the…
NAME arch_prctl – set architecture-specific thread state SYNOPSIS #include <asm/prctl.h> #include <sys/prctl.h> int arch_prctl(int code, unsigned long addr); int arch_prctl(int code, unsigned long *addr); DESCRIPTION arch_prctl() sets architecture-specific process or thread state. code selects a subfunction and passes argument addr to it; addr is interpreted as either an unsigned long for the "set" operations, or…
NAME alloc_hugepages, free_hugepages – allocate or free huge pages SYNOPSIS void *alloc_hugepages(int key, void *addr, size_t len, int prot, int flag); int free_hugepages(void *addr); DESCRIPTION The system calls alloc_hugepages() and free_hugepages() were introduced in Linux 2.5.36 and removed again in 2.5.54. They existed only on i386 and ia64 (when built with CONFIG_HUGETLB_PAGE). In Linux 2.4.20,…
NAME alarm – set an alarm clock for delivery of a signal SYNOPSIS #include <unistd.h> unsigned int alarm(unsigned int seconds); DESCRIPTION alarm() arranges for a SIGALRM signal to be delivered to the calling process in seconds seconds. If seconds is zero, any pending alarm is canceled. In any event any previously set alarm() is canceled….
NAME afs_syscall, break, fattach, fdetach, ftime, getmsg, getpmsg, gtty, isastream, lock, madvise1, mpx, prof, profil, putmsg, putpmsg, security, stty, tuxcall, ulimit, vserver – unimplemented system calls SYNOPSIS Unimplemented system calls. DESCRIPTION These system calls are not implemented in the Linux kernel. RETURN VALUE These system calls always return -1 and set errno to ENOSYS. NOTES…
NAME adjtimex, clock_adjtime, ntp_adjtime – tune kernel clock SYNOPSIS #include <sys/timex.h> int adjtimex(struct timex *buf); int clock_adjtime(clockid_t clk_id, struct timex *buf); int ntp_adjtime(struct timex *buf); DESCRIPTION Linux uses David L. Mills’ clock adjustment algorithm (see RFC 5905). The system call adjtimex() reads and optionally sets adjustment parameters for this algorithm. It takes a pointer to…
NAME add_key – add a key to the kernel’s key management facility SYNOPSIS #include <keyutils.h> #include <sys/types.h> key_serial_t add_key(const char *type, const char *description, const void *payload, size_t plen, key_serial_t keyring); No glibc wrapper is provided for this system call; see NOTES. DESCRIPTION add_key() creates or updates a key of the given type and description,…
NAME acct – switch process accounting on or off SYNOPSIS #include <unistd.h> int acct(const char *filename); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): acct(): Since glibc 2.21 : _DEFAULT_SOURCE In glibc 2.19 and 2.20 : _DEFAULT_SOURCE || (_XOPEN_SOURCE && _XOPEN_SOURCE & nbsp; < 500) Up to and including glibc 2.19 : _BSD_SOURCE ||…
NAME access, faccessat, faccessat2 – check user’s permissions for a file SYNOPSIS #include <unistd.h> int access(const char *pathname, int mode); #include <fcntl.h> /* Definition of AT_* constants */ #include <unistd.h> int faccessat(int dirfd, const char *pathname, int mode, int flags); /* But see C library/kernel differences, below */ int faccessat2(int dirfd, const char *pathname, int…
NAME accept, accept4 – accept a connection on a socket SYNOPSIS #include <sys/socket.h> #include <sys/types.h> /* See NOTES */ int accept(int sockfd, struct sockaddr *addr, socklen_t *addrlen); #define _GNU_SOURCE /* See feature_test_macros(7) */ #include <sys/socket.h> int accept4(int sockfd, struct sockaddr *addr, socklen_t *addrlen, int flags); DESCRIPTION The accept() system call is used with connection-based socket…
NAME accept, accept4 – accept a connection on a socket SYNOPSIS #include <sys/socket.h> #include <sys/types.h> /* See NOTES */ int accept(int sockfd, struct sockaddr *addr, socklen_t *addrlen); #define _GNU_SOURCE /* See feature_test_macros(7) */ #include <sys/socket.h> int accept4(int sockfd, struct sockaddr *addr, socklen_t *addrlen, int flags); DESCRIPTION The accept() system call is used with connection-based socket…
NAME zvbid – VBI proxy daemon SYNOPSIS zvbid [ options ] DESCRIPTION zvbid is a proxy for VBI devices, i.e. it forwards one or more VBI data streams to one or more connected clients and manages channel change requests. OPTIONS -dev path Path of a device from which to read data. This argument can be…
NAME zvbi-ntsc-cc – closed caption decoder SYNOPSIS zvbi-ntsc-cc [ options ] DESCRIPTION zvbi-ntsc-cc reads vbi data from /dev/vbi and decodes the enclosed cc data. Start it with ‘-h’ to get a list of cmd line options. AUTHORS timecop [at] japan.co.jp Mike Baker <mbm [at] linux.com> Adam <adam [at] cfar.umd.edu> COPYRIGHT This program is free software;…
NAME zvbi-chains – VBI proxy wrapper SYNOPSIS zvbi-chains [ options ] DESCRIPTION zvbi-chains is a small wrapper which executes the VBI application given on the command line while overloading several C library calls (such as open(2) and read(2)) so that the application can be forced to access VBI devices via the VBI proxy instead of…
NAME zvbi-atsc-cc – ATSC Closed Caption decoder SYNOPSIS zvbi-atsc-cc [ options ] [-n] station name DESCRIPTION zvbi-atsc-cc captures ATSC TV transmissions using a Linux DVB device and decodes the enclosed Closed Caption data. It can record both NTSC caption (EIA 608-B) and DTVCC caption (CEA 708-C). OPTIONS -? -h –help –usage Print a short usage…
zuluSafe – command line tool that manages encrypted and unencrypted volumes Description This is a simple tool for secure storage of files in a wallet.Added files to the wallet will be stored in a secured file located at wallet name" Usage usage: see examples below options: To add a file to a wallet,run : zuluSafe…