All commands477
- Command
- Description
- accept
- accept a connection on a socket
- accept4
- accept a connection on a socket
- access
- check user's permissions for a file
- acct
- switch process accounting on or off
- add_key
- add a key to the kernel's key management facility
- adjtimex
- tune kernel clock
- afs_syscall
- unimplemented system calls
- alarm
- set an alarm clock for delivery of a signal
- alloc_hugepages
- allocate or free huge pages
- arch_prctl
- set architecture-specific thread state
- arm_fadvise
- predeclare an access pattern for file data
- arm_fadvise64_64
- predeclare an access pattern for file data
- arm_sync_file_range
- sync a file segment with disk
- bdflush
- start, flush, or tune buffer-dirty-flush daemon
- bind
- bind a name to a socket
- bpf
- perform a command on an extended BPF map or program
- break
- unimplemented system calls
- brk
- change data segment size
- cacheflush
- flush contents of instruction and/or data cache
- capget
- set/get capabilities of thread(s)
- capset
- set/get capabilities of thread(s)
- chdir
- change working directory
- chown32
- change ownership of a file
- clock_getres
- clock and time functions
- clock_gettime
- clock and time functions
- clock_nanosleep
- high-resolution sleep with specifiable clock
- clock_settime
- clock and time functions
- clone
- create a child process
- clone2
- create a child process
- __clone2
- create a child process
- clone3
- create a child process
- close
- close a file descriptor
- connect
- initiate a connection on a socket
- copy_file_range
- Copy a range of data from one file to another
- creat
- open and possibly create a file
- create_module
- create a loadable module entry
- delete_module
- unload a kernel module
- dup
- duplicate a file descriptor
- dup2
- duplicate a file descriptor
- dup3
- duplicate a file descriptor
- epoll_create
- open an epoll file descriptor
- epoll_create1
- open an epoll file descriptor
- epoll_ctl
- control interface for an epoll file descriptor
- epoll_pwait
- wait for an I/O event on an epoll file descriptor
- epoll_wait
- wait for an I/O event on an epoll file descriptor
- eventfd
- create a file descriptor for event notification
- eventfd2
- create a file descriptor for event notification
- execve
- execute program
- execveat
- execute program relative to a directory file descriptor
- exit
- terminate the calling process
- _exit
- terminate the calling process
- exit_group
- exit all threads in a process
- faccessat
- check user's permissions for a file
- fadvise64
- predeclare an access pattern for file data
- fadvise64_64
- predeclare an access pattern for file data
- fanotify_init
- create and initialize fanotify group
- fanotify_mark
- add, remove, or modify an fanotify mark on a filesystem object
- fattach
- unimplemented system calls
- fchdir
- change working directory
- fchmod
- change permissions of a file
- fchmodat
- change permissions of a file
- fchown
- change ownership of a file
- fchown32
- change ownership of a file
- fchownat
- change ownership of a file
- fcntl
- manipulate file descriptor
- fcntl64
- manipulate file descriptor
- fdatasync
- synchronize a file's in-core state with storage device
- fdetach
- unimplemented system calls
- fgetxattr
- retrieve an extended attribute value
- finit_module
- load a kernel module
- flistxattr
- list extended attribute names
- fork
- create a child process
- free_hugepages
- allocate or free huge pages
- fremovexattr
- remove an extended attribute
- fsetxattr
- set an extended attribute value
- fstat
- get file status
- fstat64
- get file status
- fstatat
- get file status
- fstatat64
- get file status
- fstatfs
- get filesystem statistics
- fstatfs64
- get filesystem statistics
- fstatvfs
- get filesystem statistics
- fsync
- synchronize a file's in-core state with storage device
- ftruncate
- truncate a file to a specified length
- ftruncate64
- truncate a file to a specified length
- futex
- fast user-space locking
- futimesat
- change timestamps of a file relative to a directory file descriptor
- getcontext
- get or set the user context
- getcpu
- determine CPU and NUMA node on which the calling thread is running
- getcwd
- get current working directory
- getdents
- get directory entries
- getdents64
- get directory entries
- getdomainname
- get/set NIS domain name
- getdtablesize
- get file descriptor table size
- getegid
- get group identity
- getegid32
- get group identity
- geteuid
- get user identity
- geteuid32
- get user identity
- getgid
- get group identity
- getgid32
- get group identity
- getgroups
- get/set list of supplementary group IDs
- getgroups32
- get/set list of supplementary group IDs
- gethostid
- get or set the unique identifier of the current host
- gethostname
- get/set hostname
- getitimer
- get or set value of an interval timer
- get_kernel_syms
- retrieve exported kernel and module symbols
- get_mempolicy
- retrieve NUMA memory policy for a thread
- getmsg
- unimplemented system calls
- getpagesize
- get memory page size
- getpeername
- get name of connected peer socket
- getpgid
- set/get process group
- getpgrp
- set/get process group
- getpid
- get process identification
- getpmsg
- unimplemented system calls
- getppid
- get process identification
- getpriority
- get/set program scheduling priority
- getrandom
- obtain a series of random bytes
- getresgid
- get real, effective and saved user/group IDs
- getresgid32
- get real, effective and saved user/group IDs
- getresuid
- get real, effective and saved user/group IDs
- getresuid32
- get real, effective and saved user/group IDs
- getrlimit
- get/set resource limits
- get_robust_list
- get/set list of robust futexes
- getrusage
- get resource usage
- getsid
- get session ID
- getsockname
- get socket name
- getsockopt
- get and set options on sockets
- get_thread_area
- manipulate thread-local storage information
- gettid
- get thread identification
- gettimeofday
- get / set time
- getuid
- get user identity
- getuid32
- get user identity
- getunwind
- copy the unwind data to caller's buffer
- getxattr
- retrieve an extended attribute value
- gtty
- unimplemented system calls
- idle
- make process 0 idle
- inb
- port I/O
- inb_p
- port I/O
- init_module
- load a kernel module
- inl
- port I/O
- inl_p
- port I/O
- inotify_add_watch
- add a watch to an initialized inotify instance
- inotify_init
- initialize an inotify instance
- inotify_init1
- initialize an inotify instance
- inotify_rm_watch
- remove an existing watch from an inotify instance
- insb
- port I/O
- insl
- port I/O
- insw
- port I/O
- inw
- port I/O
- inw_p
- port I/O
- io_cancel
- cancel an outstanding asynchronous I/O operation
- ioctl
- control device
- ioctl_console
- ioctls for console terminal and virtual consoles
- ioctl_fat
- manipulating the FAT filesystem
- ioctl_ficlone
- share some the data of one file with another file
- ioctl_ficlonerange
- share some the data of one file with another file
- ioctl_fideduperange
- share some the data of one file with another file
- ioctl_getfsmap
- retrieve the physical layout of the filesystem
- ioctl_iflags
- ioctl() operations for inode flags
- ioctl_list
- list of ioctl calls in Linux/i386 kernel
- ioctl_ns
- ioctl() operations for Linux namespaces
- ioctl_tty
- ioctls for terminals and serial lines
- ioctl_userfaultfd
- create a file descriptor for handling page faults in user space
- ioctl_xfs_ag_geometry
- query XFS allocation group geometry information
- ioctl_xfs_bulkstat
- query information for a batch of XFS inodes
- ioctl_xfs_fsbulkstat
- query information for a batch of XFS inodes
- ioctl_xfs_fscounts
- query XFS summary counter information
- ioctl_xfs_fsgetxattr
- query information for an open file
- ioctl_xfs_fsinumbers
- extract a list of valid inode numbers from an XFS filesystem
- ioctl_xfs_fsop_geometry
- report XFS filesystem layout and features
- ioctl_xfs_getbmapx
- query extent information for an open file
- ioctl_xfs_getresblks
- query and set XFS free space reservation information
- ioctl_xfs_goingdown
- shut down an XFS filesystem
- ioctl_xfs_inumbers
- query allocation information for groups of XFS inodes
- ioctl_xfs_scrub_metadata
- check XFS filesystem metadata
- io_destroy
- destroy an asynchronous I/O context
- io_getevents
- read asynchronous I/O events from the completion queue
- ioperm
- set port input/output permissions
- iopl
- change I/O privilege level
- ioprio_get
- get/set I/O scheduling class and priority
- ioprio_set
- get/set I/O scheduling class and priority
- io_setup
- create an asynchronous I/O context
- io_submit
- submit asynchronous I/O blocks for processing
- ipc
- System V IPC system calls
- isastream
- unimplemented system calls
- kcmp
- compare two processes to determine if they share a kernel resource
- kexec_file_load
- load a new kernel for later execution
- kexec_load
- load a new kernel for later execution
- killpg
- send signal to a process group
- lchown
- change ownership of a file
- lchown32
- change ownership of a file
- lgetxattr
- retrieve an extended attribute value
- linkat
- make a new name for a file
- listen
- listen for connections on a socket
- listxattr
- list extended attribute names
- llistxattr
- list extended attribute names
- llseek
- reposition read/write file offset
- _llseek
- reposition read/write file offset
- lock
- unimplemented system calls
- lookup_dcookie
- return a directory entry's path
- lremovexattr
- remove an extended attribute
- lseek
- reposition read/write file offset
- lsetxattr
- set an extended attribute value
- lstat
- get file status
- lstat64
- get file status
- madvise
- give advice about use of memory
- madvise1
- unimplemented system calls
- mbind
- set memory policy for a memory range
- membarrier
- issue memory barriers on a set of threads
- memfd_create
- create an anonymous file
- migrate_pages
- move all pages in a process to another set of nodes
- mincore
- determine whether pages are resident in memory
- mkdirat
- create a directory
- mknodat
- create a special or ordinary file
- mlock
- lock and unlock memory
- mlock2
- lock and unlock memory
- mlockall
- lock and unlock memory
- mmap
- map or unmap files or devices into memory
- mmap2
- map files or devices into memory
- modify_ldt
- get or set a per-process LDT entry
- mount
- mount filesystem
- move_pages
- move individual pages of a process to another node
- mprotect
- set protection on a region of memory
- mpx
- unimplemented system calls
- mq_getsetattr
- get/set message queue attributes
- mq_notify
- register for notification when a message is available
- mq_open
- open a message queue
- mq_timedreceive
- receive a message from a message queue
- mq_timedsend
- send a message to a message queue
- mq_unlink
- remove a message queue
- mremap
- remap a virtual memory address
- msgctl
- System V message control operations
- msgget
- get a System V message queue identifier
- msgop
- System V message queue operations
- msgrcv
- System V message queue operations
- msgsnd
- System V message queue operations
- msync
- synchronize a file with a memory map
- munlock
- lock and unlock memory
- munlockall
- lock and unlock memory
- munmap
- map or unmap files or devices into memory
- name_to_handle_at
- obtain handle for a pathname and open file via a handle
- nanosleep
- high-resolution sleep
- newfstatat
- get file status
- _newselect
- synchronous I/O multiplexing
- nfsservctl
- syscall interface to kernel nfs daemon
- oldfstat
- get file status
- oldlstat
- get file status
- oldolduname
- get name and information about current kernel
- oldstat
- get file status
- olduname
- get name and information about current kernel
- open
- open and possibly create a file
- openat
- open and possibly create a file
- open_by_handle_at
- obtain handle for a pathname and open file via a handle
- outb
- port I/O
- outb_p
- port I/O
- outl
- port I/O
- outl_p
- port I/O
- outsb
- port I/O
- outsl
- port I/O
- outsw
- port I/O
- outw
- port I/O
- outw_p
- port I/O
- pause
- wait for signal
- perf_event_open
- set up performance monitoring
- perfmonctl
- interface to IA-64 performance monitoring unit
- personality
- set the process execution domain
- phys
- unimplemented system calls
- pidfd_open
- obtain a file descriptor that refers to a process
- pidfd_send_signal
- send a signal to a process specified by a file descriptor
- pipe
- create pipe
- pipe2
- create pipe
- pivot_root
- change the root mount
- pkey_alloc
- allocate or free a protection key
- pkey_free
- allocate or free a protection key
- pkey_mprotect
- set protection on a region of memory
- poll
- wait for some event on a file descriptor
- posix_fadvise
- predeclare an access pattern for file data
- ppoll
- wait for some event on a file descriptor
- prctl
- operations on a process
- pread
- read from or write to a file descriptor at a given offset
- pread64
- read from or write to a file descriptor at a given offset
- preadv
- read or write data into multiple buffers
- preadv2
- read or write data into multiple buffers
- prlimit64
- get/set resource limits
- process_vm_readv
- transfer data between process address spaces
- process_vm_writev
- transfer data between process address spaces
- prof
- unimplemented system calls
- pselect
- synchronous I/O multiplexing
- pselect6
- synchronous I/O multiplexing
- ptrace
- process trace
- putmsg
- unimplemented system calls
- putpmsg
- unimplemented system calls
- pwrite
- read from or write to a file descriptor at a given offset
- pwrite64
- read from or write to a file descriptor at a given offset
- pwritev
- read or write data into multiple buffers
- pwritev2
- read or write data into multiple buffers
- query_module
- query the kernel for various bits pertaining to modules
- quotactl
- manipulate disk quotas
- read
- read from a file descriptor
- readahead
- initiate file readahead into page cache
- readdir
- read directory entry
- readlinkat
- read value of a symbolic link
- readv
- read or write data into multiple buffers
- reboot
- reboot or enable/disable Ctrl-Alt-Del
- recv
- receive a message from a socket
- recvfrom
- receive a message from a socket
- recvmmsg
- receive multiple messages on a socket
- recvmsg
- receive a message from a socket
- remap_file_pages
- create a nonlinear file mapping
- removexattr
- remove an extended attribute
- renameat
- change the name or location of a file
- renameat2
- change the name or location of a file
- request_key
- request a key from the kernel's key management facility
- restart_syscall
- restart a system call after interruption by a stop signal
- rt_sigaction
- examine and change a signal action
- rt_sigpending
- examine pending signals
- rt_sigprocmask
- examine and change blocked signals
- rt_sigqueueinfo
- queue a signal and data
- rt_sigreturn
- return from signal handler and cleanup stack frame
- rt_sigsuspend
- wait for a signal
- rt_sigtimedwait
- synchronously wait for queued signals
- rt_tgsigqueueinfo
- queue a signal and data
- s390_guarded_storage
- operations with z/Architecture guarded storage facility
- s390_pci_mmio_read
- transfer data to/from PCI MMIO memory page
- s390_pci_mmio_write
- transfer data to/from PCI MMIO memory page
- s390_runtime_instr
- enable/disable s390 CPU run-time instrumentation
- s390_sthyi
- emulate STHYI instruction
- sbrk
- change data segment size
- sched_getaffinity
- set and get a thread's CPU affinity mask
- sched_getattr
- set and get scheduling policy and attributes
- sched_getparam
- set and get scheduling parameters
- sched_get_priority_max
- get static priority range
- sched_get_priority_min
- get static priority range
- sched_getscheduler
- set and get scheduling policy/parameters
- sched_rr_get_interval
- get the SCHED_RR interval for the named process
- sched_setaffinity
- set and get a thread's CPU affinity mask
- sched_setattr
- set and get scheduling policy and attributes
- sched_setparam
- set and get scheduling parameters
- sched_setscheduler
- set and get scheduling policy/parameters
- sched_yield
- yield the processor
- seccomp
- operate on Secure Computing state of the process
- security
- unimplemented system calls
- select
- synchronous I/O multiplexing
- select_tut
- synchronous I/O multiplexing
- semctl
- System V semaphore control operations
- semget
- get a System V semaphore set identifier
- semop
- System V semaphore operations
- semtimedop
- System V semaphore operations
- send
- send a message on a socket
- sendfile
- transfer data between file descriptors
- sendfile64
- transfer data between file descriptors
- sendmmsg
- send multiple messages on a socket
- sendmsg
- send a message on a socket
- sendto
- send a message on a socket
- setcontext
- get or set the user context
- setdomainname
- get/set NIS domain name
- setegid
- set effective user or group ID
- seteuid
- set effective user or group ID
- setfsgid
- set group identity used for filesystem checks
- setfsgid32
- set group identity used for filesystem checks
- setfsuid
- set user identity used for filesystem checks
- setfsuid32
- set user identity used for filesystem checks
- setgid
- set group identity
- setgid32
- set group identity
- setgroups
- get/set list of supplementary group IDs
- setgroups32
- get/set list of supplementary group IDs
- sethostid
- get or set the unique identifier of the current host
- sethostname
- get/set hostname
- setitimer
- get or set value of an interval timer
- set_mempolicy
- set default NUMA memory policy for a thread and its children
- setns
- reassociate thread with a namespace
- setpgid
- set/get process group
- setpgrp
- set/get process group
- setpriority
- get/set program scheduling priority
- setregid
- set real and/or effective user or group ID
- setregid32
- set real and/or effective user or group ID
- setresgid
- set real, effective and saved user or group ID
- setresgid32
- set real, effective and saved user or group ID
- setresuid
- set real, effective and saved user or group ID
- setresuid32
- set real, effective and saved user or group ID
- setreuid
- set real and/or effective user or group ID
- setreuid32
- set real and/or effective user or group ID
- setrlimit
- get/set resource limits
- set_robust_list
- get/set list of robust futexes
- setsockopt
- get and set options on sockets
- set_thread_area
- manipulate thread-local storage information
- set_tid_address
- set pointer to thread ID
- settimeofday
- get / set time
- setuid
- set user identity
- setuid32
- set user identity
- setup
- setup devices and filesystems, mount root filesystem
- setxattr
- set an extended attribute value
- sgetmask
- manipulation of signal mask (obsolete)
- shmat
- System V shared memory operations
- shmctl
- System V shared memory control
- shmdt
- System V shared memory operations
- shmget
- allocates a System V shared memory segment
- shmop
- System V shared memory operations
- shutdown
- shut down part of a full-duplex connection
- sigaction
- examine and change a signal action
- sigaltstack
- set and/or get signal stack context
- signal
- ANSI C signal handling
- signalfd
- create a file descriptor for accepting signals
- signalfd4
- create a file descriptor for accepting signals
- sigpending
- examine pending signals
- sigprocmask
- examine and change blocked signals
- sigqueue
- queue a signal and data to a process
- sigreturn
- return from signal handler and cleanup stack frame
- sigsuspend
- wait for a signal
- sigtimedwait
- synchronously wait for queued signals
- sigwaitinfo
- synchronously wait for queued signals
- socket
- create an endpoint for communication
- socketcall
- socket system calls
- socketpair
- create a pair of connected sockets
- splice
- splice data to/from a pipe
- spu_create
- create a new spu context
- spu_run
- execute an SPU context
- ssetmask
- manipulation of signal mask (obsolete)
- stat64
- get file status
- statfs
- get filesystem statistics
- statfs64
- get filesystem statistics
- statvfs
- get filesystem statistics
- statx
- get file status (extended)
- stime
- set time
- subpage_prot
- define a subpage protection for an address range
- swapoff
- start/stop swapping to file/device
- swapon
- start/stop swapping to file/device
- symlink
- make a new name for a file
- symlinkat
- make a new name for a file
- sync_file_range
- sync a file segment with disk
- sync_file_range2
- sync a file segment with disk
- syncfs
- commit filesystem caches to disk
- syscall
- indirect system call
- _syscall
- invoking a system call without library support (OBSOLETE)
- syscalls
- Linux system calls
- sysctl
- read/write system parameters
- _sysctl
- read/write system parameters
- sysfs
- get filesystem type information
- sysinfo
- return system information
- syslog
- read and/or clear kernel message ring buffer; set console_loglevel
- tgkill
- send a signal to a thread
- timer_create
- create a POSIX per-process timer
- timer_delete
- delete a POSIX per-process timer
- timerfd_create
- timers that notify via file descriptors
- timerfd_gettime
- timers that notify via file descriptors
- timerfd_settime
- timers that notify via file descriptors
- timer_getoverrun
- get overrun count for a POSIX per-process timer
- timer_gettime
- arm/disarm and fetch state of POSIX per-process timer
- timer_settime
- arm/disarm and fetch state of POSIX per-process timer
- times
- get process times
- tkill
- send a signal to a thread
- truncate64
- truncate a file to a specified length
- tuxcall
- unimplemented system calls
- ugetrlimit
- get/set resource limits
- umask
- set file mode creation mask
- umount
- unmount filesystem
- umount2
- unmount filesystem
- unimplemented
- unimplemented system calls
- unlinkat
- delete a name and possibly the file it refers to
- uselib
- load shared library
- userfaultfd
- create a file descriptor for handling page faults in user space
- ustat
- get filesystem statistics
- utime
- change file last access and modification times
- utimensat
- change file timestamps with nanosecond precision
- utimes
- change file last access and modification times
- vfork
- create a child process and block parent
- vhangup
- virtually hangup the current terminal
- vm86
- enter virtual 8086 mode
- vm86old
- enter virtual 8086 mode
- vmsplice
- splice user pages to/from a pipe
- vserver
- unimplemented system calls
- wait
- wait for process to change state
- wait3
- wait for process to change state, BSD style
- wait4
- wait for process to change state, BSD style
- waitid
- wait for process to change state
- waitpid
- wait for process to change state
- writev
- read or write data into multiple buffers