e2freefrag:- is used to report free space fragmentation on ext2/3/4 file systems.
e2fsck:- e2fsck is used to check the ext2/ext3/ext4 family of file systems.
e2image:- The e2image program will save critical ext2, ext3, or ext4 filesystem metadata located on device to a file specified by image-file.
e2label:- e2label will display or change the filesystem label on the ext2, ext3, or ext4 filesystem located on device.
e2undo:- e2undo will replay the undo log undo_log for an ext2/ext3/ext4 filesystem found on device. This can be used to undo a failed operation by an e2fsprogs program.
e4defrag:- online defragmenter for ext4 filesystem
eapol_test:- EAP peer and RADIUS client testing
ebtables:- ebtables is an application program used to set up and maintain the tables of rules (inside the Linux kernel) that inspect Ethernet frames.
echo:- display a line of text
ed:- line-oriented text editor
edquota:- edit user quotas
egrep:- grep, egrep, fgrep - print lines matching a pattern
eject:- eject removable media (typically a CD-ROM, floppy disk, tape, JAZ, ZIP or USB disk)
elfedit:- Update the ELF header of ELF files.
env:- run a program in a modified environment
envsubst:- substitutes environment variables in shell format strings
eqn:- format equations for troff or MathML
era_check:- checks era metadata created by the device-mapper era target on a device or file.
era_dump:- dump era metadata from device or file to standard output
era_invalidate:- Provide a list of blocks that have changed since a particular era.
ether-wake:- A tool to send a Wake-On-LAN "Magic Packet"
ethtool:- query or control network driver and hardware settings
ex:- Vim is a text editor that is upwards compatible to Vi. It can be used to edit all kinds of plain text. It is especially useful for editing programs.
expand:- Convert tabs in each FILE to spaces, writing to standard output. With no FILE, or when FILE is -, read standard input.
exportfs:- An NFS server maintains a table of local physical file systems that are accessible to NFS clients. Each file system in this table is referred to as an exported file system, or export, for short.
expr:- evaluate expressions. (Ex: expr 9 – 3)