D

date:- print or set the system date and time
db_archive:-
db_checkpoint:-
db_deadlock:-
db_dump:-
db_dump185:-
db_hotbackup:-
db_load:-
db_log_verify:-
db_printlog:-
db_recover:-
db_replicate:-
db_stat:-
db_tuner:-
db_upgrade:-
dbus-binding-tool:-
dbus-cleanup-sockets:-
dbus-daemon:-
dbus-monitor:-
dbus-send:-
dbus-uuidgen:-
db_verify:-
dc:- dc is a reverse-polish desk calculator which supports unlimited precision arithmetic.
dd:- convert and copy a file
deallocvt:- deallocate unused virtual consoles
debugfs:- ext2/ext3/ext4 file system debugger
debuginfo-install:- install debuginfo packages and their dependencies
delpart:- is a program that asks the Linux kernel to remove a partition.
depmod:- Generate modules.dep and map files.
desktop-file-edit:- The  desktop-file-install  program is a tool to install, and optionally edit, desktop files. The desktop-file-edit program is a tool to edit a desktop file. They are mostly useful for developers and packagers.
desktop-file-install:- The  desktop-file-install  program is a tool to install, and optionally edit, desktop files. The desktop-file-edit program is a tool to edit a desktop file. They are mostly useful for developers and packagers.
desktop-file-validate:- Validate desktop entry files
df:- report file system disk space usage
dgawk:- pattern scanning and processing language
dhclient:- Dynamic Host Configuration Protocol Client
dhclient-script:- DHCP client network configuration script
diff:- compare files line by line
diff3:- compare three files line by line
dig:- dig (domain information groper) is a flexible tool for interrogating DNS name servers.
dir:- list directory contents
dircolors:- color setup for ls
dirname:- strip last component from file name
dm_dso_reg_tool:- A utility used to load a DSO into dmeventd and (un)register devices with it for monitoring
dmesg:- print or control the kernel ring buffer
dmeventd:- Device-mapper event daemon
dmevent_tool:- A utility used to load a DSO into dmeventd and (un)register devices with it for monitoring
dmidecode:- dmidecode  is a tool for dumping a computer's DMI (some say SMBIOS) table contents in a human-readable format.
dmraid:- discover, configure and activate software (ATA)RAID
dmraid.static:- discover, configure and activate software (ATA)RAID
dmsetup:- low level logical volume management
dnsdomainname:- Hostname is used to display the system's DNS name, and to display or set its hostname or NIS domain name.
dnsmasq:- is a lightweight DNS, TFTP, PXE, router advertisement and DHCP server. It is intended to provide coupled DNS and DHCP service to a LAN.
domainname:- is used to display the system's DNS name, and to display or set its hostname or NIS domain name.
dosfsck:- fsck.fat verifies the consistency of MS-DOS filesystems and optionally tries to repair them.
dosfslabel:-
dracut:- low-level tool for generating an initramfs image
du:- Summarize disk usage of each FILE, recursively for directories.
dump-acct:- print an acct/pacct file in human-readable format
dumpe2fs:- prints the super block and blocks group information for the filesystem present on device.
dumpkeys:- dumpkeys writes, to the standard output, the current contents of the keyboard driver's translation tables, in the format specified by keymaps(5).
dump-utmp:- dump-acct filename prints a list of all logins. This list is usually written in /var/log/wtmp.
dvigif:- This program makes PNG and/or GIF graphics from DVI files as obtained from TeX and its relatives.

dvipng:- This program makes PNG and/or GIF graphics from DVI files as obtained from TeX and its relatives.
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