This page is a megalist of linux commands. This document provides a little insight on some common and not so common linux commands and binaries. (more…)

bash, :, ., [, alias, bg, bind, break, builtin, cd, command, compgen,
complete, continue, declare, dirs, disown, echo, enable, eval, exec,
exit, export, fc, fg, getopts, hash, help, history, jobs, kill, let,
local, logout, popd, printf, pushd, pwd, read, readonly, return, set,
shift, shopt, source, suspend, test, times, trap, type, typeset,
ulimit, umask, unalias, unset, wait

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…)