rsync - faster, flexible replacement for rcp

Synopsis
rsync [OPTION]… SRC [SRC]… [USER@]HOST:DEST

rsync [OPTION]… [USER@]HOST:SRC DEST

rsync [OPTION]… SRC [SRC]… DEST

rsync [OPTION]… [USER@]HOST::SRC [DEST]

rsync [OPTION]… SRC [SRC]… [USER@]HOST::DEST

rsync [OPTION]… rsync://[USER@]HOST[:PORT]/SRC [DEST]

rsync [OPTION]… SRC [SRC]… rsync://[USER@]HOST[:PORT]/DEST

Description
rsync is a program that behaves in much the same way that rcp does,
but has many more options and uses the rsync remote-update protocol to
greatly speed up file transfers when the destination file is being
updated. (more…)

scp - secure copy (remote file copy program)

Synopsis
scp [-1246BCpqrv] [-c cipher] [-F ssh_config] [-i identity_file]
[-l limit] [-o ssh_option] [-P port] [-S program]
[[user@]host1:]file1 […] [[user@]host2:]file2

Description
scp copies files between hosts on a network. It uses ssh(1) for data
transfer, and uses the same authentication and provides the same secu-
rity as ssh(1). Unlike rcp(1), scp will ask for passwords or
passphrases if they are needed for authentication. (more…)

sshd - OpenSSH SSH daemon

Synopsis
sshd [-46Ddeiqt] [-b bits] [-f config_file] [-g login_grace_time]
[-h host_key_file] [-k key_gen_time] [-o option] [-p port] [-u len]

Description
sshd (SSH Daemon) is the daemon program for ssh(1). Together these pro-
grams replace rlogin and rsh, and provide secure encrypted communica-
tions between two untrusted hosts over an insecure network. The pro-
grams are intended to be as easy to install and use as possible. (more…)

chkconfig - updates and queries runlevel information for system services

Synopsis
chkconfig –list [name]
chkconfig –add name
chkconfig –del name
chkconfig [–level levels] name
chkconfig [–level levels] name

Description
chkconfig provides a simple command-line tool for maintaining the
/etc/rc[0-6].d directory hierarchy by relieving system administrators
of the task of directly manipulating the numerous symbolic links in
those directories. (more…)

ssh-add - adds RSA or DSA identities to the authentication agent

Synopsis
ssh-add [-lLdDxXc] [-t life] [file …]
ssh-add -s reader
ssh-add -e reader

Description
ssh-add adds RSA or DSA identities to the authentication agent,
ssh-agent(1). When run without arguments, it adds the files
$HOME/.ssh/id_rsa, $HOME/.ssh/id_dsa and $HOME/.ssh/identity. Alterna-
tive file names can be given on the command line. If any file requires
a passphrase, ssh-add asks for the passphrase from the user. The
passphrase is read from the user’s tty. ssh-add retries the last
passphrase if multiple identity files are given. (more…)

ssh_config - OpenSSH SSH client configuration files

Synopsis
$HOME/.ssh/config
/etc/ssh/ssh_config

Description
ssh obtains configuration data from the following sources in the follow-
ing order:
1. command-line options
2. user’s configuration file ($HOME/.ssh/config)
3. system-wide configuration file (/etc/ssh/ssh_config) (more…)

ssh - OpenSSH SSH client (remote login program)

Synopsis

ssh [-1246AaCfgkMNnqsTtVvXxY] [-b bind_address] [-c cipher_spec]
[-D port] [-e escape_char] [-F configfile] [-i identity_file] [-L
port:host:hostport] [-l login_name] [-m mac_spec] [-o option]
[-p port] [-R port:host:hostport] [-S ctl] [user@]hostname [command]

Description
ssh (SSH client) is a program for logging into a remote machine and for
executing commands on a remote machine. It is intended to replace
rlogin and rsh, and provide secure encrypted communications between two
untrusted hosts over an insecure network. X11 connections and arbitrary
TCP/IP ports can also be forwarded over the secure channel. (more…)

httpd - Apache Hypertext Transfer Protocol Server

Synopsis
httpd [ -d serverroot ] [ -f config ] [ -C directive ] [ -c directive
] [ -D parameter ] [ -e level ] [ -E file ] [ -k start|restart|grace-
ful|stop ] [ -R directory ] [ -h ] [ -l ] [ -L ] [ -S ] [ -t ] [ -v ]
[ -V ] [ -X ]

On Windows systems, the following additional arguments are available:

httpd [ -k install|config|uninstall ] [ -n name ] [ -w ]

Summary
httpd is the Apache HyperText Transfer Protocol (HTTP) server program.
It is designed to be run as a standalone daemon process. When used
like this it will create a pool of child processes or threads to han-
dle requests.

In general, httpd should not be invoked directly, but rather should be
invoked via apachectl on Unix-based systems or as a service on Windows
NT, 2000 and XP and as a console application on Windows 9x and ME. (more…)

patch - apply a diff file to an original

Synopsis
patch [options] [originalfile [patchfile]]

but usually just

patch -pnum

Description
patch takes a patch file patchfile containing a difference listing
produced by the diff program and applies those differences to one or
more original files, producing patched versions. Normally the patched
versions are put in place of the originals. Backups can be made; see
the -b or –backup option. The names of the files to be patched are
usually taken from the patch file, but if there’s just one file to be
patched it can specified on the command line as originalfile. (more…)

diff - find differences between two files

Synopsis
diff [options] from-file to-file

Description
In the simplest case, diff compares the contents of the two files
from-file and to-file. A file name of - stands for text read from the
standard input. As a special case, diff - - compares a copy of stan-
dard input to itself. (more…)