https://github.com/ranfdev/learn_bash

https://github.com/ranfdev/learn_bash

Last synced: 4 days ago
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• Host: GitHub
• URL: https://github.com/ranfdev/learn_bash
• Owner: ranfdev
• License: gpl-3.0
• Created: 2018-11-26T16:53:45.000Z (about 6 years ago)
• Default Branch: master
• Last Pushed: 2018-11-28T21:29:21.000Z (about 6 years ago)
• Last Synced: 2024-10-31T14:06:11.614Z (about 2 months ago)
• Size: 16.6 KB
• Stars: 0
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# learn_bash

Here i will put some bash tips i have discovered. These are not only related to bash, but to the terminal in general.

## shortcuts

| shortuct | action |

| ---------| -------|

| ctrl+a | start of the line |

| ctrl+e | end of the line |

| ctrl+u | cut from cursor to start |

| ctrl+y | paste what you have just cut |

| ctrl+r | search in history |

| ctrl+l | clear screen |

## command substitution

to insert the result of a command as a parameter, put the command between two ticks ``` ` ``` or ```$()```

```

touch `date`

```

## brace expansion

By putting some curly braces near an expression, you can combine the expression with the content of the braces

```

echo 1{1,2,3} {a,b,c}{a,b}

```

returns

```

11 12 13 aa ab ba bb ca cb

```

## tar

- To create a tar archive:

```

  tar -cf destination from_folder

```

- To create a tar archive from stdin:

```

  random_program | tar -cf destination --null -T -

```

random_program should return a file list separated by null characters, to support names with \n or other escape sequences.

after tar, the flag --null enables reading that list of files. The option -T is used to describe where to get the list from. - is the stdin.

## netcat

- to start listening for tcp connections on a port:

```

  nc -l port_number

```

- to connect to a remote server which is listening for tcp connections:

```

  nc ip port

```

After establishing a connection between two machines, everything you type in that terminal session,

is sent to the other device.

- send file to other device:

  on the sender device:

  ```nc -l port < file_path```

  on the receiver:

  ```nc ip port > file_path```

 

 - show progress on the receiver

 ```nc ip port | pv > file_path```

 where pv is a utility used to analyze a pipe, it shows the current speed and the bytes transfered.

 

 ## gpg

 - basic file encryption:

  ```gpg -c file```

  outputs the file as file.gpg, encrypted.

 - basic file decryption:

 ```gpg -d file > dest```

 

 

## fzf

this is a must have. This program is a fuzzy search utility that can be integrated with various other programs.