modified: README.md

README.md

@@ -1,11 +1,15 @@
+# Linux
+
+## Table of contents
 <!-- TOC -->
-- [hostname/hostnamectl](#hostnamehostnamectl)
+- [Linux](#linux)
+  - [Table of contents](#table-of-contents)
   - [Update](#update)
     - [Debian / Ubuntu](#debian--ubuntu)
     - [Fedora](#fedora)
   - [ls](#ls)
   - [Users](#users)
-- [hostame](#hostame)
+  - [hostname / hostnamectl](#hostname--hostnamectl)
   - [static ip](#static-ip)
   - [Disks](#disks)
   - [mount](#mount)
@@ -24,34 +28,25 @@
     - [Create key](#create-key)
     - [Copy public key](#copy-public-key)
     - [Add existing Key](#add-existing-key)
-  - [alias](#alias)
+    - [Alias](#alias)
+    - [Port Binding](#port-binding)
+      - [Documentation](#documentation)
   - [Benchmarking](#benchmarking)
   - [themes](#themes)
     - [shell](#shell)
     - [terminal](#terminal)
   - [Backups](#backups)
     - [bash](#bash)
-- [disable touh screen](#disable-touh-screen)
+  - [disable touch screen](#disable-touch-screen)
-- [disable suspend blackscreen](#disable-suspend-blackscreen)
+  - [disable suspend black screen](#disable-suspend-black-screen)
   - [lightdm auto login](#lightdm-auto-login)
   - [btop](#btop)
     - [Setup](#setup)
-    - [Debian & Ubuntu](#debian--ubuntu)
+      - [Debian \& Ubuntu](#debian--ubuntu-1)
   - [lspci](#lspci)
   - [gnome files / nautilus](#gnome-files--nautilus)
 <!-- /TOC -->
 
-# Linux
-
-## hostname/hostnamectl
-
-```bash
-#get hostname
-hostname
-
-#set hostname
-hostnamectl
-```
 
 ## Update
 
@@ -115,9 +110,16 @@ chown [-c|--changes] [-v|--verbose] [-f|--silent|--quiet] [--dereference]
       {new-owner|--reference=ref-file} file ...
 ```
 
-## hostame
+## hostname / hostnamectl
+
+``` bash
+
+#get hostname
+hostname
+
+#set hostname
+hostnamectl
 
-```
 sudo nano /etc/hostname
 #alterar o nome
 sudo nano /etc/hosts
@@ -132,7 +134,7 @@ Debian
 sudo nano /etc/network/interfaces
 Exemplo de configuração
 
-```
+``` bash
 # neste exemplo de configuração a place de rede tem o nome enxd0374555c1f8 
 
 # This file describes the network interfaces available on your system
@@ -155,7 +157,7 @@ iface enxd0374555c1f8 inet static
 Reiniciar configuração sem reboot de computador
 ```
 
-```
+``` bash
 Reiniciar configuração sem reboot de computador
 #sudo /etc/init.d/networking restart
 ```
@@ -164,25 +166,25 @@ Reiniciar configuração sem reboot de computador
 
 File System & Space Usage
 
-```
+``` bash
 df -h
 ```
 
 List physical disks and partition size
 
-```
+``` bash
 lsblk
 ```
 
 List partition ids
 
-```
+``` bash
 blkid /dev/sdc1
 ```
 
 Partition Manager
 
-```
+``` bash
 fdisk /dev/<DISK NAME>
 #Example:
 fdisk /dev/sdc
@@ -201,22 +203,22 @@ mkpart primary ext4 0 4
 
 ## mount
 
-Mount partion on boot fstab
+Mount partition on boot fstab
 
-```
+``` bash
 nano /etc/fstabexemplo de alias
 ```
 
 ext4 example
 
-```
+``` bash
 #add line
 PARTUUID=<PARTUUID GIVEN blksid>  <FOLDER WHERE TO MOUNT> ext4 defaults,nofail 0 02
 ```
 
 Mount fstab partions without reboot
 
-```
+``` bash
 mount -a
 ```
 
@@ -224,7 +226,7 @@ smb share
 
 Create credentials file
 
-```
+``` bash
 #/home/mf/.credentials/smb:mf@nas.lan
 username=shareuser
 password=sharepassword
@@ -233,13 +235,13 @@ domain=domain_or_workgroupname
 
 Secure credentials file permission
 
-```
+``` bash
 chmod 0600 /home/mf/.credentials/smb:mf@nas.lan
 ```
 
 Add line
 
-```
+``` bash
 #/etc/fstab
 //nas.lan/homes /mnt/smb-share:mf@nas.lan,share=homes cifs credentials=/home/mf/.credentials/smb:mf@nas.lan,uid=1000,gid=1000,nofail 0 0
 ```
@@ -280,7 +282,7 @@ mkfs.ext3 _filesys_
 
 Example
 
-```
+``` bash
 mkfs.ext3 /dev/sdb1
 #exFat
 mkfs.exfat /dev/sdc1
@@ -291,13 +293,13 @@ mkfs.exfat /dev/sdc1
 
 mkfs.exfat _filesys_
 
-```
+``` bash
 mkfs.exfat /dev/sdc1
 ```
 
 ### ntfs
 
-```
+``` bash
 apt-get install ntfs-3g
 mkntfs --fast --label Backups /dev/sdc1
 ```
@@ -314,7 +316,7 @@ du -h --max-depth=1
 
 Bad Sectors
 sudo e2fsck -cfpv /dev/sda1
-O Exemplo foi com o disco sda1 mas deverá ser subsituido pelo disco desejado
+O Exemplo foi com o disco sda1 mas deverá ser substituído pelo disco desejado
 
 Os parâmetros têm os seguintes significados:
 
@@ -355,7 +357,8 @@ ssh-keygen -t ecdsa -b 521 -f ~/.ssh/key-ecdsa
 
 ### Copy public key
 
-```bashssh-add ~/.ssh/id_ed25519
+```bash
+ssh-add ~/.ssh/id_ed25519
 ssh-copy-id -i ~/.ssh//ey-ecdsa.pub example_user@192.0.2.4
 ```
 
@@ -365,7 +368,7 @@ ssh-copy-id -i ~/.ssh//ey-ecdsa.pub example_user@192.0.2.4
 ssh-add ~/.ssh/key-ecdsa
 ```
 
-### alias
+### Alias
 
 ```bash
 Host srv01
@@ -375,6 +378,56 @@ Host srv01
     RequestTTY yes
 ```
 
+### Port Binding
+
+Bind local port 8001 to target-server port 80 using jump-machine.local.  
+_(local machine without direct access to target-server)_
+
+```bash
+ssh -f -N -L localhost:8001:target-server:80 usr@jump-machine.local
+```
+
+#### Documentation
+
+``` bash
+# man
+-f      Requests ssh to go to background just before command
+        execution.  This is useful if ssh is going to ask for
+        passwords or passphrases, but the user wants it in the
+        background.  This implies -n.  The recommended way to
+        start X11 programs at a remote site is with something
+        like ssh -f host xterm.
+
+-N      Do not execute a remote command.  This is useful for just
+        forwarding ports.  Refer to the description of
+        SessionType in ssh_config(5) for details.
+
+-L [bind_address:]port:host:hostport
+-L [bind_address:]port:remote_socket
+-L local_socket:host:hostport
+-L local_socket:remote_socket
+
+        Specifies that connections to the given TCP port or Unix socket on the
+        local (client) host are to be forwarded to the given host and port, or
+        Unix socket, on the remote side.  This works by allocating a socket to
+        listen to either a TCP port on the local side, optionally bound to the
+        specified bind_address, or to a Unix socket.  Whenever a connection is
+        made to the local port or socket, the connection is forwarded over the 
+        secure channel, and a connection is made to either host port hostport, 
+        or the Unix socket remote_socket, from the remote machine.
+
+        Port forwardings can also be specified in the configuration file.  Only
+        the superuser can forward privileged ports.  IPv6 addresses can be
+        specified by enclosing the address in square brackets.
+
+        By default, the local port is bound in accordance with the GatewayPorts
+        setting.  However, an explicit bind_address may be used to bind the
+        connection to a specific address.  The bind_address of “localhost”
+        indicates that the listening port be bound for local use only, while an
+        empty address or ‘*’ indicates that the port should be available from
+        all interfaces.
+
+```
 
 ## Benchmarking
 
@@ -384,7 +437,7 @@ sudo hdparm -Tt /dev/sdc
 
 ## themes
 
-- https://github.com/EliverLara/Nordic
+- <https://github.com/EliverLara/Nordic>
 
 ### shell
 
@@ -462,7 +515,7 @@ find $BACKUP_DIR/* -mtime +10 -exec rm {} \;
 gio mount -u ftp://ftp.backups@backupsrv01.dev.lan
 ```
 
-## disable touh screen
+## disable touch screen
 
 ``` bash
 sudo apt-get -y install xinput
@@ -485,6 +538,7 @@ Source: https://askubuntu.com/questions/759335/how-to-disable-a-touchscreen-on-s
 [Seat:*]
 xserver-command=X -s 0 dpms
 ```
+
 ## lightdm auto login
 
 ```bash
@@ -512,16 +566,14 @@ Displays information about each PCI bus on your system. This includes informatio
 
 lspci [options]
 
-
 | Option | Description |
 | -------- | ------------- |
 | -v     | Verbose     |
 
-
 ``` bash
 lspci -v
 ```
 
 ## gnome files / nautilus
 
-https://www.maketecheasier.com/useful-nautlius-tweaks-linux/
+<https://www.maketecheasier.com/useful-nautlius-tweaks-linux/>