R

raid-check:-
ranlib:- generate index to archive.
raw:- is  used to bind a Linux raw character device to a block device.
rct:- Displays information (headers) about or size and statistics of a entitlement, product, or identity certificate used by Red Hat Subscription Manager.
rdate:- get the time via the network
rdisc:- network router discovery daemon
read:-
readarray:-
readelf:- Displays information about ELF files.
readlink:- print resolved symbolic links or canonical file names
readonly:-
readprofile:- read kernel profiling information
realpath:- print the resolved path
reboot:- halt, poweroff, reboot - Halt, power-off or reboot the machine
recode-sr-latin:- convert Serbian text from Cyrillic to Latin script
red:- Ed - line-oriented text editor
redhat-support-tool:-
regdbdump:- parse and print out regulatory rules file
rename:- rename files
renice:- alter priority of running processes
repoclosure:- display a list of unresolved dependencies for a yum repository
repodiff:- list differences between two or more Yum repositories
repo-graph:- output a full package dependency graph in dot format
repomanage:- list the newest or oldest RPM packages in a directory
repoquery:- query information from Yum repositories
repo-rss:- generates an RSS feed from one or more Yum repositories
report-cli:- Work with ABRT problem directories from command line.
reporter-mailx:- Sends contents of a problem directory via email.
reporter-rhtsupport:- Reports problem to RHTSupport.
reporter-ureport:- Reports ABRT problems in format of micro report
reposync:- synchronize yum repositories to a local directory
repotrack:- track a package and its dependencies and download them
repquota:- summarize quotas for a filesystem
request-key:- Handle key instantiation callback requests from the kernel
reset:- tset, reset - terminal initialization.
resize2fs:- ext2/ext3/ext4 file system resizer
resizecons:- change kernel idea of the console size
resizepart:- is a program that informs the Linux kernel of new partition size.
restorecon:- restore file(s) default SELinux security contexts.
return:-
rev:- reverse lines of a file or files (Ex:- rev file)
rfkill:- tool for enabling and disabling wireless devices
rhn-channel:- spacewalk-channel - Subscribe to or unsubscribe system from channel.
rhn_check:- Check for and execute queued actions on RHN.
rhn-profile-sync:- Update system information on Spacewalk server.
rhn_register:- Connect to Spacewalk Server, Red Hat Satellite or Red Hat Network Classic.
rhnreg_ks:- A program for non interactively registering systems to Spacewalk Server, Red Hat Satellite or Red Hat Network Classic.
rhnsd:- A program for querying the Spacewalk server for updates and information.
rhsmcertd:- Periodically scans and updates the entitlement certificates on a registered system.
rhsm-debug:- Compiles information about system's entitlements, products, and identity used by Red Hat Subscription Manager.
rm:- remove files or directories
rmail:-
rmail.postfix:-
rmdir:- remove empty directories
rmmod:- Simple program to remove a module from the Linux Kernel
rnano:- Restricted mode for Nano's ANOther editor, an enhanced free Pico clone
rngd:- Check and feed random data from hardware device to kernel random device
rngtest:- Check the randomness of data using FIPS 140-2 tests
route:- show / manipulate the IP routing table (Ex:- route)
routef:- list routes with pretty output format
routel:- list routes with pretty output format
rpcbind:- universal addresses to RPC program number mapper
rpcdebug:- set and clear NFS and RPC kernel debug flags
rpcgen:-
rpc.gssd:- To establish GSS security contexts using these credential files, the Linux kernel RPC client depends on a userspace daemon called  rpc.gssd.   The  rpc.gssd daemon uses the rpc_pipefs filesystem to communicate with the kernel.
rpc.idmapd:- is the NFSv4 ID <-> name mapping daemon.  It provides functionality to the NFSv4 kernel client and server, to which it communicates via upcalls, by translating user and group IDs to names, and vice versa.
rpcinfo:- report RPC information
rpc.mountd:- The  rpc.mountd  daemon  implements  the  server  side  of  the  NFS  MOUNT protocol, an NFS side protocol used by NFS version 2 [RFC1094] and NFS version 3 [RFC1813].
rpc.nfsd:- The  rpc.nfsd program implements the user level part of the NFS service. The main functionality is handled by the nfsd kernel module. The user space program merely specifies what sort of sockets the kernel service should listen on, what NFS versions it should support, and how many kernel threads it should use.
rpc.rquotad:- server which returns quotas for a user of a local filesystem which is mounted by a remote machine over the NFS.
rpc.statd:- File locks are not part of persistent file system state.  Lock state is thus lost when a host reboots.
rpc.svcgssd:- The  rpcsec_gss  protocol  gives a means of using the gss-api generic security api to provide security for protocols using rpc (in particular, nfs).
rpm:- RPM Package Manager
rpm2cpio:- Extract cpio archive from RPM Package Manager (RPM) package.
rpmdb:- RPM Database Tool
rpmkeys:- RPM Keyring
rpmquery:-
rpmverify:-
rsync:- a fast, versatile, remote (and local) file-copying tool
rsyslogd:- reliable and extended syslogd
rsyslog-recover-qi.pl:-
rtacct:- nstat, rtacct - network statistics tools.
rtcwake:- enter a system sleep state until specified wakeup time
rtmon:- listens to and monitors RTnetlink
rtpr:-
rtstat:- unified linux network statistics
runcon:- run command with specified SELinux security context
runlevel:- Print previous and current SysV runlevel (Ex:- runlevel)
run-parts:- configuration and scripts for running periodical jobs
runuser:- run a command with substitute user and group ID
rvi:- Vi IMproved, a programmers text editor
rview:- Vi IMproved, a programmers text editor

rvim:- Vi IMproved, a programmers text editor
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