
## GnuPG

[Official documentation](https://www.gnupg.org/gph/en/manual.html)

### Generate a GPG key

```shell
gpg --full-generate-key
gpg --gen-key # Equivalent to above
```

### Generate a revocation certificate

```shell
gpg --gen-revoke --output revoke.asc <user ID>
```

[Ways to specify a user ID](https://www.gnupg.org/documentation/manuals/gnupg/Specify-a-User-ID.html)

### List all keys

```shell
gpg --list-secret-keys
gpg --list-key # Equivalent to above
gpg -k # Equivalent to above
gpg --list-secret-keys --keyid-format=long # List the long form of the keys
```

### Export a public key

```shell
gpg --armor --export <user ID> # Print the GPG public key in ASCII armor format
gpg --output username.gpg --export <user ID> # Export in binary format
```

### Import a public key

```shell
gpg --import alice.gpg
```

### Export a fingerprint

```shell
gpg --fingerprint <user ID>
```

### Encrypt a document

```shell
gpg --output doc.gpg --encrypt --recipient <recipient_email> doc
```

### Decrypt a document

```shell
gpg --output doc --decrypt doc.gpg
```


[Top]

GnuPG

Generate a GPG key

Generate a revocation certificate

List all keys

Export a public key

Import a public key

Export a fingerprint

Encrypt a document

Decrypt a document


## Check for existing keys

```shell
ls -al ~/.ssh
```

## Generate a new key

```shell
ssh-keygen -t ed25519 -C "your_email@example.org" # Recommended
ssh-keygen -t rsa -b 4096 -C "your_email@example.org" # For legacy systems
```

## Add your key to the ssh-agent

```shell
eval "$(ssh-agent -s)"
ssh-add ~/.ssh/<Private key file>
```



## `rsync`

```shell
rsync -r dir1/ dir2
# Sync dir1 with dir2 on the same system; Recurse into directories
# Trailing slash means "the contents of dir1"

# Useful options
# -a, --archive: Preserve symlinks, modification times, group, owner, permissions, etc
# -n, --dry-run: Perform a trial run that doesn't make any changes
# -v, --verbose: Increase the amount of information you are given during the transfer
# -z, --compress: Compress file data during the transfer
# --progress: Show progress during transfer
# --partial: Keep partially transferred files
# -P: Same as --partial --progress
# --delete: Delete extraneous files from dest dirs

rsync -a --delete --backup --backup-dir=<path_to_backup> <source> <destination>
# Store backups of important files

rsync -a --exclude=<pattern_to_exclude> <source> <destination>
# Exclude certain files

rsync -a --exclude=<pattern_to_exclude> --include=<pattern_to_include> <source> <destination>
# Exclude files matching pattern_to_exclude but include files matching pattern_to_include
```

### Push

```shell
rsync [options] <source> <username@host>:<destination>
```

### Pull

```shell
rsync [options] <username@host>:<source> <destination>
```

## `rclone`

```shell
rclone config # Enter an interactive configuration session.
rclone listremotes # List remotes
rclone ls remote:path [options] # List objects in path
rclone lsd remote:path [options] # List directories in path
rclone copy <source> remote:<destination> # Copy source to the remote
rclone sync -i <source> remote:<destination> # Sync source to the remote

# Useful options
# -P: Show progress during transfer
# -i: Enable interactive mode
# -n, --dry-run: Do a trial run with no permanent changes
```


PGP