Linux whatis command searches the whatis database for complete words.
See some command descriptions from whatis database:
addpart (8) - simple wrapper around the add partition ioctl
agetty (8) - alternative Linux getty
arch (1) - print machine hardware name (same as uname -m)
arp (7) - Linux ARP kernel module
arp (8) - manipulate the system ARP cache
arping (8) - send ARP REQUEST to a neighbour host
audispd (8) - an event multiplexor
auditctl (8) - a utility to assist controlling the kernel's audit system
aureport (8) - a tool that produces summary reports of audit daemon logs
ausearch (8) - a tool to query audit daemon logs
ausearch-expression (5) - audit search expression format
autrace (8) - a program similar to strace
awk (1p) - pattern scanning and processing language
badblocks (8) - search a device for bad blocks
basename (1p) - return non-directory portion of a pathname
basename (1) - strip directory and suffix from filenames
basename (3) - parse pathname components
basename (3p) - return the last component of a pathname
bash (1) - GNU Bourne-Again SHell
blkdeactivate (8) - utility to deactivate block devices
blkdiscard (8) - discard sectors on a device
blkid (8) - command-line utility to locate/print block device attributes
blockdev (8) - call block device ioctls from the command line
bridge (8) - show / manipulate bridge addresses and devices
cat (1) - concatenate files and print on the standard output
cat (1p) - concatenate and print files
cfdisk (8) - Curses based disk partition table manipulator for Linux
chcpu (8) - configure CPUs
chgrp (1) - change group ownership
chgrp (1p) - change the file group ownership
chkconfig (8) - updates and queries runlevel information for system services
chmod (1) - change file mode bits
chmod (1p) - change the file modes
chmod (2) - change permissions of a file
chmod (3p) - change mode of a file
chown (1) - change file owner and group
chown (1p) - change the file ownership
chown (2) - change ownership of a file
chown (3p) - change owner and group of a file
clock (3) - Determine processor time
clock (3p) - report CPU time used
consoletype (1) - print type of the console connected to standard input
cp (1) - copy files and directories
cp (1p) - copy files
cpio (1) - copy files to and from archives
ctrlaltdel (8) - set the function of the Ctrl-Alt-Del combination
cut (1p) - cut out selected fields of each line of a file
cut (1) - remove sections from each line of files
date (1) - print or set the system date and time
date (1p) - write the date and time
dd (1) - convert and copy a file
dd (1p) - convert and copy a file
debugfs (8) - ext2/ext3/ext4 file system debugger
delpart (8) - simple wrapper around the del partition ioctl
depmod (8) - program to generate modules.dep and map files
df (1p) - report free disk space
df (1) - report file system disk space usage
dhclient (8) - Dynamic Host Configuration Protocol Client
dhclient-script (8) - DHCP client network configuration script
dmesg (1) - print or control the kernel ring buffer
dmeventd (8) - Device-mapper event daemon
dmsetup (8) - low level logical volume management
dracut (8) - create initial ramdisk images for preloading modules
dumpe2fs (8) - dump ext2/ext3/ext4 filesystem information
dumpkeys (1) - dump keyboard translation tables
e2fsck (8) - check a Linux ext2/ext3/ext4 file system
e2image (8) - Save critical ext2/ext3/ext4 filesystem metadata to a file
e2label (8) - Change the label on an ext2/ext3/ext4 filesystem
e2undo (8) - Replay an undo log for an ext2/ext3/ext4 filesystem
echo (1) - display a line of text
echo (1p) - write arguments to standard output
env (1p) - set the environment for command invocation
env (1) - run a program in a modified environment
Env (3pm) - perl module that imports environment variables as scalars or arrays
ether-wake (8) - A tool to send a Wake-On-LAN Magic Packet
ethtool (8) - query or control network driver and hardware settings
ex (1p) - text editor
faillock (8) - Tool for displaying and modifying the authentication failure record files
false (1) - do nothing, unsuccessfully
false (1p) - return false value
fdisk (8) - Partition table manipulator for Linux
find (1p) - find files
find (1) - search for files in a directory hierarchy
findfs (8) - Find a filesystem by label or UUID
findmnt (8) - find a filesystem
fixfiles (8) - fix file SELinux security contexts
fsadm (8) - utility to resize or check filesystem on a device
fsck (8) - check and repair a Linux file system
fsfreeze (8) - suspend access to an filesystem (Linux Ext3/4, ReiserFS, JFS, XFS)
fstab-decode (8) - run a command with fstab-encoded arguments
fstrim (8) - discard unused blocks on a mounted filesystem
fuser (1) - identify processes using files or sockets
fuser (1p) - list process IDs of all processes that have one or more files open
gawk (1) - pattern scanning and processing language
genhostid (1) - generate and set a hostid for the current host
getkey (1) - wait until a key is pressed
grep (1) - print lines matching a pattern
grep (1p) - search a file for a pattern
grub (8) - the grub shell
grubby (8) - command line tool for configuring grub, lilo, and elilo
grub-install (8) - install GRUB on your drive
grub-md5-crypt (8) - Encrypt a password in MD5 format
grub-terminfo (8) - Generate a terminfo command from a terminfo name
gzip (1) - compress or expand files
halt (8) - reboot or stop the system
hostname (1) - show or set the system's host name
hostname (7) - hostname resolution description
hwclock (8) - query and set the hardware clock (RTC)
ifcfg (8) - simplistic script which replaces ifconfig IP managment
ifconfig (8) - configure a network interface
ifdown (8) - take a network interface down
ifenslave (8) - Attach and detach slave network devices to a bonding device
ifup (8) - bring a network interface up
init (5) - Upstart init daemon job configuration
init (8) - Upstart process management daemon
initctl (8) - init daemon control tool
insmod (8) - simple program to insert a module into the Linux Kernel
install-info (1) - update info/dir entries
installkernel (8) - tool to script kernel installation
ip6tables (8) - IPv6 packet filter administration
ip6tables-restore (8) - Restore IPv6 Tables
ip6tables-save (8) - dump iptables rules to stdout
ip (7) - Linux IPv4 protocol implementation
ip (8) - show / manipulate routing, devices, policy routing and tunnels
ipcalc (1) - perform simple manipulation of IP addresses
ipmaddr (8) - adds, deletes, and displays multicast addresses
iptables (8) - administration tool for IPv4 packet filtering and NAT
iptables-restore (8) - Restore IP Tables
iptables-save (8) - dump iptables rules to stdout
iptables-xml (8) - Convert iptables-save format to XML
iptunnel (8) - creates, deletes, and displays configured tunnels
kbd_mode (1) - report or set the keyboard mode
kill (1p) - terminate or signal processes
kill (1) - terminate a process
kill (2) - send signal to a process
kill (3p) - send a signal to a process or a group of processes
killall5 (8) -- send a signal to all processes
link (1) - call the link function to create a link to a file
link (1p) - call link function
link (2) - make a new name for a file
link (3p) - link to a file
ln (1) - make links between files
ln (1p) - link files
loadkeys (1) - load keyboard translation tables
load_policy (8) - load a new SELinux policy into the kernel
logger (1) - a shell command interface to the syslog(3) system log module
logger (1p) - log messages
login (1) - sign on
login (3) - write utmp and wtmp entries
logsave (8) - save the output of a command in a logfile
losetup (8) - set up and control loop devices
ls (1) - list directory contents
ls (1p) - list directory contents
lsblk (8) - list block devices
lsinitrd (1) - tool to show the contents of an initramfs image
lsmod (8) - program to show the status of modules in the Linux Kernel
lspci (8) - list all PCI devices
lvchange (8) - change attributes of a logical volume
lvconvert (8) - convert a logical volume from linear to mirror or snapshot
lvcreate (8) - create a logical volume in an existing volume group
lvdisplay (8) - display attributes of a logical volume
lvextend (8) - extend the size of a logical volume
lvm (8) - LVM2 tools
lvmchange (8) - change attributes of the logical volume manager
lvmconf (8) - LVM configuration modifier
lvmdiskscan (8) - scan for all devices visible to LVM2
lvmdump (8) - create lvm2 information dumps for diagnostic purposes
lvmetad (8) - LVM metadata cache daemon
lvmsadc (8) - LVM system activity data collector
lvmsar (8) - LVM system activity reporter
lvreduce (8) - reduce the size of a logical volume
lvremove (8) - remove a logical volume
lvrename (8) - rename a logical volume
lvresize (8) - resize a logical volume
lvs (8) - report information about logical volumes
lvscan (8) - scan (all disks) for Logical Volumes
makedev (3) - manage a device number
MAKEDEV (8) - create devices
matchpathcon (8) - get the default SELinux security context for the specified path from the file contexts configuration
mii-diag (8) - Network adapter control and monitoring
mii-tool (8) - view, manipulate media-independent interface status
mingetty (8) - minimal getty for consoles
mkdir (1) - make directories
mkdir (1p) - make directories
mkdir (2) - create a directory
mkdir (3p) - make a directory
mke2fs (8) - create an ext2/ext3/ext4 filesystem
mkfs (8) - build a Linux file system
mkhomedir_helper (8) - Helper binary that creates home directories
mkinitrd (8) - is a compat wrapper, which calls dracut to generate an initramfs
mknod (1) - make block or character special files
mknod (2) - create a special or ordinary file
mknod (3p) - make a directory, a special file, or a regular file
mkswap (8) - set up a Linux swap area
mktemp (1) - create a temporary file or directory
mktemp (3) - make a unique temporary filename
mktemp (3p) - make a unique filename (LEGACY)
modinfo (8) - program to show information about a Linux Kernel module
modprobe (8) - program to add and remove modules from the Linux Kernel
more (1) - file perusal filter for crt viewing
more (1p) - display files on a page-by-page basis
mount (2) - mount file system
mount (8) - mount a filesystem
mountpoint (1) - see if a directory is a mountpoint
mv (1) - move (rename) files
mv (1p) - move files
nameif (8) - name network interfaces based on MAC addresses
netreport (1) - request notification of network interface changes
netstat (8) - Print network connections, routing tables, interface statistics, masquerade connections, and multicast memberships
nice (1p) - invoke a utility with an altered nice value
nice (1) - run a program with modified scheduling priority
nice (2) - change process priority
nice (3p) - change the nice value of a process
nologin (5) - prevent non-root users from logging into the system
nologin (8) - politely refuse a login
pam_console_apply (8) - set or revoke permissions for users at the system console
pam_tally2 (8) - The login counter (tallying) module
pam_timestamp_check (8) - Check to see if the default timestamp is valid
partx (8) - telling the kernel about presence and numbering of on-disk partitions
pidof (8) -- find the process ID of a running program
ping6 (8) - send ICMP ECHO_REQUEST to network hosts
ping (8) - send ICMP ECHO_REQUEST to network hosts
pivot_root (2) - change the root file system
pivot_root (8) - change the root file system
plipconfig (8) - fine tune PLIP device parameters
plymouth (8) - A graphical boot system and logger
poweroff (8) - reboot or stop the system
ppp-watch (8) - daemon to make PPP interfaces act more like other interfaces
ps (1p) - report process status
ps (1) - report a snapshot of the current processes
pvchange (8) - change attributes of a physical volume
pvck (8) - check physical volume metadata
pvcreate (8) - initialize a disk or partition for use by LVM
pvdisplay (8) - display attributes of a physical volume
pvmove (8) - move physical extents
pvremove (8) - remove a physical volume
pvresize (8) - resize a disk or partition in use by LVM2
pvs (8) - report information about physical volumes
pvscan (8) - scan all disks for physical volumes
pwd (1p) - return working directory name
pwd (1) - print name of current/working directory
quotacheck (8) - scan a filesystem for disk usage, create, check and repair quota files
quotaoff (8) - turn filesystem quotas on and off
quotaon (8) - turn filesystem quotas on and off
raw (7) - Linux IPv4 raw sockets
raw (8) - bind a Linux raw character device
rdisc (8) - network router discovery daemon
readlink (1) - print value of a symbolic link or canonical file name
readlink (2) - read value of a symbolic link
readlink (3p) - read the contents of a symbolic link
reboot (2) - reboot or enable/disable Ctrl-Alt-Del
reboot (8) - reboot or stop the system
resize2fs (8) - ext2/ext3/ext4 file system resizer
restorecon (8) - restore file(s) default SELinux security contexts
rm (1p) - remove directory entries
rm (1) - remove files or directories
rmdir (1p) - remove directories
rmdir (1) - remove empty directories
rmdir (2) - delete a directory
rmdir (3p) - remove a directory
rmmod (8) - simple program to remove a module from the Linux Kernel
route (8) - show / manipulate the IP routing table
rpm (8) - RPM Package Manager
rsyslogd (8) - reliable and extended syslogd
rtmon (8) - listens to and monitors RTnetlink
runlevel (7) - event signalling change of system runlevel
runlevel (8) - output previous and current runlevel
runuser (1) - run a shell with substitute user and group IDs
scsi_id (8) - retrieve and generate a unique SCSI identifier
securetty (5) - file which lists ttys from which root can log in
securetty (8) - add a tty to /etc/securetty
sed (1p) - stream editor
sed (1) - stream editor for filtering and transforming text
service (8) - run a System V init script
setfiles (8) - set file SELinux security contexts
setfont (8) - load EGA/VGA console screen font
setpci (8) - configure PCI devices
setsysfont (8) - set console font according to /etc/sysconfig/i18n
sfdisk (8) - Partition table manipulator for Linux
sh (1p) - shell, the standard command language interpreter
shutdown (2) - shut down part of a full-duplex connection
shutdown (3p) - shut down socket send and receive operations
shutdown (8) - bring the system down
slattach (8) - attach a network interface to a serial line
sleep (1) - delay for a specified amount of time
sleep (1p) - suspend execution for an interval
sleep (3p) - suspend execution for an interval of time
sleep (3) - Sleep for the specified number of seconds
sln (8) - static ln
sort (1p) - sort, merge, or sequence check text files
sort (1) - sort lines of text files
sort (3pm) - perl pragma to control sort() behaviour
stty (1) - change and print terminal line settings
stty (1p) - set the options for a terminal
su (1) - run a shell with substitute user and group IDs
sulogin (8) - Single-user login
sushell (8) - execute the single-user shell
swapon (2) - start/stop swapping to file/device
swapon (8) - enable/disable devices and files for paging and swapping
switch_root (8) - switch to another filesystem as the root of the mount tree
sync (1) - flush file system buffers
sync (2) - commit buffer cache to disk
sync (3p) - schedule file system updates
sync (8) - synchronize data on disk with memory
sysctl (2) - read/write system parameters
sysctl (8) - configure kernel parameters at runtime
taskset (1) - retrieve or set a process's CPU affinity
tc (8) - show / manipulate traffic control settings
telinit (8) - change system runlevel
touch (1) - change file timestamps
touch (1p) - change file access and modification times
tracepath6 (8) - traces path to a network host discovering MTU along this path
tracepath (8) - traces path to a network host discovering MTU along this path
true (1) - do nothing, successfully
true (1p) - return true value
tune2fs (8) - adjust tunable filesystem parameters on ext2/ext3/ext4 filesystems
udevadm (8) - udev management tool
udevd (8) - event managing daemon
umount (2) - unmount file system
umount (8) - unmount file systems
uname (1p) - return system name
uname (1) - print system information
uname (2) - get name and information about current kernel
uname (3p) - get the name of the current system
unicode_start (1) - put keyboard and console in unicode mode
unicode_stop (1) - revert keyboard and console from unicode mode
unix_chkpwd (8) - Helper binary that verifies the password of the current user
unix_update (8) - Helper binary that updates the password of a given user
unlink (1) - call the unlink function to remove the specified file
unlink (1p) - call the unlink function
unlink (2) - delete a name and possibly the file it refers to
unlink (3p) - remove a directory entry
usleep (1) - sleep some number of microseconds
usleep (3p) - suspend execution for an interval
usleep (3) - suspend execution for microsecond intervals
vgcfgbackup (8) - backup volume group descriptor area
vgcfgrestore (8) - restore volume group descriptor area
vgchange (8) - change attributes of a volume group
vgck (8) - check volume group metadata
vgconvert (8) - convert volume group metadata format
vgcreate (8) - create a volume group
vgdisplay (8) - display attributes of volume groups
vgexport (8) - make volume groups unknown to the system
vgextend (8) - add physical volumes to a volume group
vgimport (8) - make exported volume groups known to the system
vgimportclone (8) - import and rename duplicated volume group (e.g. a hardware snapshot)
vgmerge (8) - merge two volume groups
vgmknodes (8) - recreate volume group directory and logical volume special files
vgreduce (8) - reduce a volume group
vgremove (8) - remove a volume group
vgrename (8) - rename a volume group
vgs (8) - report information about volume groups
vgscan (8) - scan all disks for volume groups and rebuild caches
vgsplit (8) - split a volume group into two
vi (1p) - screen-oriented (visual) display editor
wipefs (8) - wipe a filesystem signature from a device
zcat (1p) - expand and concatenate data
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