F

factor:- Print the prime factors of each specified integer NUMBER.

faillock:- Tool for displaying and modifying the authentication failure record files

fallocate:- is  used to preallocate blocks to a file.  For filesystems which support the fallocate system call,

false:- do nothing, unsuccessfully

fatlabel:- set or gets a MS-DOS filesystem label from a given device.

fc:-

fc-cache:- build font information cache files

fc-cat:- read font information cache files

fc-list:- list available fonts

fc-match:- match available fonts

fc-pattern:- parse and show pattern

fc-query:- query font files

fc-scan:- scan font files or directories

fc-validate:- validate font files

fdformat:- low-level format a floppy disk

fdisk:- is a menu-driven program for creation and manipulation of partition tables.  It understands DOS-type partition tables and BSD- or SUN-type disk labels.

fg:-

fgconsole:- print the number of the active VT. If the active Virtual Terminal is /dev/ttyN, then prints N on standard output.

fgrep:- grep, egrep, fgrep - print lines matching a pattern

fi:-

file:- determine file type

filebench:- interprets WML script and generates appropriate filesystem workload

filefrag:- report on file fragmentation

find:- search for files in a directory hierarchy

find2perl:- translate find command lines to Perl code

findfs:- find a filesystem by label or UUID See also blkid(8), fsck(8)

findmnt:- will  list  all  mounted  filesytems  or  search  for  a  filesystem. (Ex: findmnt)

find-repos-of-install:- is a program which reports the Yum repository that a specified package was installed from. (Ex: find-repos-of-install)

fipscheck:- will perform a FIPS-140-2 validation of a file using a stored checksum of a file.

fipshmac:- fipshmac will create FIPS-140-2 checksum files for all the filenames specified.

firewall-cmd:- is the command line client of the firewalld daemon. It provides interface to manage runtime and permanent configuration.

firewalld:- provides a dynamically managed firewall with support for network/firewall zones to define the trust level of network connections or interfaces.

firewall-offline-cmd:- is an offline command line client of the firewalld daemon. It should be used only if the firewalld service is not running.

fixfiles:- fix file SELinux security contexts.

flock:- manage locks from shell scripts

fmt:- simple optimal text formatter

fold:- wrap each input line to fit in specified width

for:-

fprintd-delete:-

fprintd-enroll:-

fprintd-list:-

fprintd-verify:-

free:- Display amount of free and used memory in the system (Ex: free)

fsadm:- utility checks or resizes the filesystem on a device.  It tries to use the same API for ext2, ext3, ext4, ReiserFS and XFS filesystem.

fsck:- check and repair a Linux filesystem

fsck.btrfs:- is a type of utility that should exist for any filesystem and is called during system setup when the corresponding /etc/fstab entries contain non-zero value for fs_passno ,

fsck.cramfs:- fsck compressed ROM file system

fsck.ext2:- check a Linux ext2/ext3/ext4 file system

fsck.ext3:- check a Linux ext2/ext3/ext4 file system

fsck.ext4:- check a Linux ext2/ext3/ext4 file system

fsck.fat:- check and repair MS-DOS filesystems

fsck.minix:- check consistency of Minix filesystem

fsck.msdos:- check and repair MS-DOS filesystems

fsck.vfat:- check and repair MS-DOS filesystems

fsck.xfs:- fsck.xfs  is  called  by  the  generic  Linux fsck(8) program at startup to check and repair an XFS filesystem.

fsfreeze:- suspend access to a filesystem (Linux Ext3/4, ReiserFS, JFS, XFS)

fstrim:- discard unused blocks on a mounted filesystem

ftp:- is the user interface to the Internet standard File Transfer Protocol.

function:-

funzip:- filter for extracting from a ZIP archive in a pipe

fxload:- is  a program which downloads firmware to USB devices based on AnchorChips EZ-USB, Cypress EZ-USB FX, or Cypress EZ-USB FX2 microcontrollers.