S

s2p:- A stream editor reads the input stream consisting of the specified files

sa:- summarizes information about previously executed commands as recorded in the acct file.

sadf:- Display data collected by sar in multiple formats.

safe_finger:- finger client wrapper that protects against nasty stuff from finger servers

sar:- Collect, report, or save system activity information. (Ex:- sar –A; -B; -b ;-C ;-d ;-H ;-h ;-p ;-q ; -R ;-r ;-S ;-t ;-u [ ALL ] ;-V ;-v ;-W ;-w ;-y)

sasl2-sample-client:-

sasl2-sample-server:-

sasl2-shared-mechlist:-

saslauthd:- is a daemon process that handles plaintext authentication requests on behalf of the SASL library.

sasldblistusers2:- list users in sasldb

saslpasswd2:- set a user's sasl password

satyr:- is a command line tool that creates anonymous reports of software problems that are suitable for automated processing.

scl:- Setup and run software from Software Collection environment

scl_enabled:-

scl_source:-

scp:- secure copy (remote file copy program), copies files between hosts on a network.  It uses ssh(1) for data transfer, and uses the same authentication and provides the same security as ssh(1).

screen:- is a full-screen window manager that multiplexes a physical terminal between several processes (typically interactive shells).

script:- make typescript of terminal session

scriptreplay:- play back typescripts, using timing information, This  program  replays  a typescript, using timing information to ensure that output happens at the same speed as it originally appeared when the script was recorded.

sdiff:- side-by-side merge of file differences (Ex:- sdiff <file name> <file name>)

secon:- See an SELinux context, from a file, program or user input.

sed:- is a stream editor.  A stream editor is used to perform basic text transformations on an input stream (a file or input from a pipeline).

sefcontext_compile:- compile file context regular expression files

select:- select() and pselect() allow a program to monitor multiple file descriptors, waiting until one or more of the file descriptors become "ready" for some class of I/O operation (e.g., input possible).

selinuxconlist:- list all SELinux context reachable for user

selinuxdefcon:- report default SELinux context for user

selinuxenabled:- tool to be used within shell scripts to determine if selinux is enabled

selinuxexeccon:- report SELinux context used for this executable

semodule:- Manage SELinux policy modules.

sendmail:- Postfix to Sendmail compatibility interface

sendmail.postfix:- Postfix to Sendmail compatibility interface

seq:- print a sequence of numbers

service:- runs a System V init script in as predictable environment as possible, removing most environment variables and with current working directory set to /.

sestatus:- SELinux status tool (Ex:- sestatus)

set:-

setarch:- change reported architecture in new program environment and set personality flags

setcap:- set file capabilities

setenforce:- modify the mode SELinux is running in

setfacl:- set file access control lists

setfattr:- The setfattr command associates a new value with an extended attribute name for each specified file.

setfiles:- set SELinux file security contexts.

setfont:- load EGA/VGA console screen font

setkeycodes:- load kernel scancode-to-keycode mapping table entries

setleds:- set the keyboard leds

setmetamode:- define the keyboard meta key handling

setpci:- configure PCI devices

setpriv:- run a program with different Linux privilege settings

setquota:- set disk quotas

setregdomain:- set regulatory domain based on timezone

setsebool:- set SELinux boolean value

setserial:- get/set Linux serial port information

setsid:- run a program in a new session

setterm:- set terminal attributes

setup:- A text mode system configuration tool

setup-nsssysinit:- Query or enable the nss-sysinit module

setup-nsssysinit.sh:-

setvtrgb:- set the virtual terminal RGB colors

sexp-conv:-

sfdisk:- partition table manipulator for Linux

sftp:- secure file transfer program

sg:- execute command as different group ID

sgpio:- captive backplane LED control utility

sh:- bash - GNU Bourne-Again SHell

sha1sum:- compute and check SHA1 message digest

sha224sum:- compute and check SHA224 message digest

sha256sum:- compute and check SHA256 message digest

sha384sum:- compute and check SHA384 message digest

sha512sum:- compute and check SHA512 message digest

shift:-

shopt:-

show-changed-rco:- show changes in an RPM package

showconsolefont:- Show the current EGA/VGA console screen font

show-installed:- show installed RPM packages and descriptions (Ex:- show-installed)

showkey:- examine the codes sent by the keyboard

showmount:- show mount information for an NFS server

shred:- overwrite a file to hide its contents, and optionally delete it

shuf:- generate random permutations

shutdown:- Halt, power-off or reboot the machine

signtool:- Digitally sign objects and files.

signver:- Verify a detached PKCS#7 signature for a file.

simc_lsmplugin:-

sim_lsmplugin:-

size:- list section sizes and total size.

skill:- skill, snice - send a signal or report process status, These tools are obsolete and unportable.

slabtop:- display kernel slab cache information in real time

slapacl:- Check access to a list of attributes.

slapadd:- Add entries to a SLAPD database

slapauth:- Check a list of string-represented IDs for LDAP authc/authz

slapcat:- SLAPD database to LDIF utility

slapd:- Stand-alone LDAP Daemon

slapdn:- Check a list of string-represented LDAP DNs based on schema syntax

slapindex:- Reindex entries in a SLAPD database

slappasswd:- OpenLDAP password utility

slapschema:- SLAPD in-database schema checking utility

slaptest:- Check the suitability of the OpenLDAP slapd configuration

slattach:- attach a network interface to a serial line

sleep:- delay for a specified amount of time

sln:- create symbolic links

slogin:- OpenSSH SSH client (remote login program)

smartctl:- Control and Monitor Utility for SMART Disks

smartd:- SMART Disk Monitoring Daemon

smbcontrol:- smbcontrol is a very small program, which sends messages to a smbd(8), a nmbd(8), or a winbindd(8) daemon running on the system.

sm-notify:- send reboot notifications to NFS peers

smtp-sink:- multi-threaded SMTP/LMTP test server

smtp-source:- multi-threaded SMTP/LMTP test generator

snice:- skill, snice - send a signal or report process status

soelim:- reads files and replaces lines of the form .so file

sort:- sort lines of text files

sosreport:- generates  an  archive  of  configuration  and diagnostic information from the running system.

sotruss:-

source:-

spacewalk-channel:- allows  you  to  subscribe  to  and unsubscribe from specified channels via the command line.

spice-vdagent:- The spice guest agent for Linux consists of 2 parts, a system wide daemon spice-vdagentd and a X11 session agent spice-vdagent of which there is one per X11 session.

spice-vdagentd:- The spice guest agent for Linux consists of 2 parts, a system wide daemon spice-vdagentd and a X11 session agent spice-vdagent of which there is one per X11 session.

splain:- diagnostics, splain - produce verbose warning diagnostics

split:- split a file into pieces (Ex:- split <file name>) new file will be create with same content.

sprof:-

sqlite3:- A command line interface for SQLite version 3

ss:- another utility to investigate sockets (Ex:- ss)

ssh:- OpenSSH SSH client (remote login program)

ssh-add:- adds private key identities to the authentication agent

ssh-agent:- authentication agent

ssh-copy-id:- use locally available keys to authorise logins on a remote machine

sshd:- OpenSSH SSH daemon

sshd-keygen:-

ssh-keygen:- authentication key generation, management and conversion

ssh-keyscan:- gather ssh public keys

ssltap:- Tap into SSL connections and display the data going by

sss_cache:- invalidates records in SSSD cache. Invalidated records are forced to be reloaded from server as soon as related SSSD backend is online.

sssd:- System Security Services Daemon, provides a set of daemons to manage access to remote directories and authentication mechanisms.

sss_ssh_authorizedkeys:- get OpenSSH authorized keys

sss_ssh_knownhostsproxy:- get OpenSSH host keys

stapdyn:- The  stapdyn  program  is  the  dyninst  back-end  of  the  Systemtap  tool.  It expects a shared library produced by the front-end stap tool, when run with --dyninst.

stap-merge:-

stap-report:- collect system information that is useful for debugging systemtap bugs

staprun:- systemtap runtime, The staprun program is the back-end of the Systemtap tool.  It expects a kernel module produced by the front-end stap tool.

stapsh:- The  stapsh  executable  is  used  by  the stap --remote functionality, as a wrapper shell on the remote machines.  It is not intended to be run directly by users.

start-statd:-

stat:- display file or file system status (Ex:- stat /dev/sdd)

stdbuf:- Run COMMAND, with modified buffering operations for its standard streams.

strace:- In the simplest case strace runs the specified command until it exits. trace system calls and signals

strace-log-merge:- finds all STRACE_LOG.PID files, adds PID prefix to every line, the combines and sorts them, and prints the result to standard output.

strings:- print the strings of printable characters in files.

strip:- Discard symbols from object files.

stty:- change and print terminal line settings

su:- run a command with substitute user and group ID

subscription-manager:- Registers systems to a subscription management service and then attaches and manages subscriptions for software products. (Ex:-  subscription-manager list)

sudo:- sudo, sudoedit — execute a command as another user

sudoedit:- sudo, sudoedit — execute a command as another user

sudoreplay:- replay sudo session logs

sulogin:- Single-user login

sum:- checksum and count the blocks in a file

sushell:- execute the single-user shell

suspend:-

swaplabel:- print or change the label or UUID of a swap area

swapoff:- swapon, swapoff - enable/disable devices and files for paging and swapping

swapon:- swapon, swapoff - enable/disable devices and files for paging and swapping

switch_root:- switch to another filesystem as the root of the mount tree

sync:- flush file system buffers

sysctl:- configure kernel parameters at runtime

system-config-authentication:- provides a simple graphical user interface for configuring user identity and system authentication services.  It provides basic configuration options to handle NIS, LDAP, Kerberos 5, and Winbind client configuration.

systemctl:- Control the systemd system and service manager

systemd-analyze:- may be used to determine system boot-up performance statistics and retrieve other state and tracing information from the system and service manager.

systemd-ask-password:- Query the user for a system password

systemd-cat:- Connect a pipeline or program's output with the journal

systemd-cgls:- recursively shows the contents of the selected Linux control group hierarchy in a tree.

systemd-cgtop:- shows the top control groups of the local Linux control group hierarchy, ordered by their CPU, memory, or disk I/O load. (Ex:- systemd-cgtop)

systemd-coredumpctl:- Retrieve coredumps from the journal

systemd-delta:- may be used to identify and compare configuration files that override other configuration files.

systemd-detect-virt:- Detect execution in a virtualized environment

systemd-inhibit:- Execute a program with an inhibition lock taken

systemd-loginctl:-

systemd-machine-id-setup:- may be used by system installer tools to initialize the machine ID stored in /etc/machine-id at install time with a randomly generated ID. See machine-id(5) for more information about this file.

systemd-notify:- Notify service manager about start-up completion and other daemon status changes

systemd-nspawn:- Spawn a namespace container for debugging, testing and building

systemd-run:- may be used to create and start a transient .service or a .scope unit and run the specified COMMAND in it.

systemd-stdio-bridge:-

systemd-sysv-convert:-

systemd-tmpfiles:- systemd-tmpfiles, systemd-tmpfiles-setup.service, systemd-tmpfiles-setup-dev.service, systemd-tmpfiles-clean.service, systemd-tmpfiles-clean.timer -Creates, deletes and cleans up volatile and temporary files and directories

systemd-tty-ask-password-agent:- systemd-tty-ask-password-agent - List or process pending systemd password requests

sys-unconfig:- provides a simple method of reconfiguring a system in a new environment. Upon executing sys-unconfig will poweroff your system, and run first boot at next boot.