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.
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