rsync4j

https://fracpete.github.io/rsync4j/
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rsync4j is a Java wrapper around rsync that provides file synchronization capabilities for Linux,...
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### Rsync Daemon Upload Example

Source: https://fracpete.github.io/rsync4j/java

Demonstrates uploading a directory to an rsync daemon. Ensure the rsync daemon is configured and running on the server, and the destination URL is correctly specified.

```java
import com.github.fracpete.rsync4j.RSync;
import com.github.fracpete.processoutput4j.output.ConsoleOutputProcessOutput;
...
RSync rsync = new RSync()
  .recursive(true)
  .times(true)
  .dirs(true)
  .verbose(true)
  .source("/home/myuser/some/where")
  .destination("rsync://192.168.1.100:12000/files/");
ConsoleOutputProcessOutput output = new ConsoleOutputProcessOutput();
output.monitor(rsync.builder());

```

--------------------------------

### Add rsync4j Core for Linux/Mac

Source: https://fracpete.github.io/rsync4j/maven

Use this dependency for Linux and Mac systems. It requires that rsync and ssh binaries are already installed locally.

```xml
    <dependency>
      <groupId>com.github.fracpete</groupId>
      <artifactId>rsync4j-core</artifactId>
      <version>3.3.0-7</version>
    </dependency>

```

--------------------------------

### Set File Permissions with rsync4j on Windows

Source: https://fracpete.github.io/rsync4j/faq

When encountering incorrect file permissions on Windows, use the `chmod` method of the `RSync` class to set appropriate permissions. The example `ugo=rwX` grants read, write, and execute permissions to owner, group, and others, with execute only for directories.

```java
.chmod("ugo=rwX")
```

--------------------------------

### Windows Path to Cygwin Path Conversion

Source: https://fracpete.github.io/rsync4j/windows

Local Windows paths are automatically converted to Cygwin notation for use with rsync4j. For example, a Windows path like C:\\some\\path\\blah.txt becomes /cygdrive/c/some/path/blah.txt.

```text
C:\\some\\path\\blah.txt
```

```text
/cygdrive/c/some/path/blah.txt
```

--------------------------------

### RSync4j Help Screen

Source: https://fracpete.github.io/rsync4j/commandline

Displays the usage and all available options for the RSync4j command-line tool. This is useful for understanding the full range of configurable parameters.

```bash
usage: com.github.fracpete.rsync4j.RSync
       [-h] [--output-commandline] [--maxtime MAXTIME] [-v]
       [--info INFO] [--debug DEBUG] [--msgs2stderr] [-q] [--no-motd] [-c]
       [-a] [-r] [-R] [--no-implied-dirs] [-b] [--backup-dir BACKUPDIR]
       [--suffix SUFFIX] [-u] [--inplace] [--append] [--append-verify] [-d]
       [-l] [-L] [--copy-unsafe-links] [--safe-links] [--munge-links] [-k]
       [-K] [-H] [-p] [-E] [--chmod CHMOD] [-X] [-o] [-g] [--devices]
       [--specials] [-t] [-O] [-J] [--super] [--fake-super] [-S]
       [--preallocate] [-n] [-W] [-x] [-B BLOCKSIZE]
       [-e RSH] [--rsync-path RSYNCPATH] [--existing] [--ignore-existing]
       [--remove-source-files] [--delete] [--delete-before]
       [--delete-during] [--delete-delay] [--delete-after]
       [--delete-excluded] [--ignore-missing-args] [--delete-missing-args]
       [--ignore-errors] [--force] [--max-delete MAXDELETE]
       [--max-size MAXSIZE] [--min-size MINSIZE] [--partial]
       [--partial-dir PARTIALDIR] [--delay-updates] [-m] [--numeric-ids]
       [--usermap USERMAP] [--groupmap GROUPMAP] [--chown CHOWN]
       [--timeout TIMEOUT] [--contimeout CONTIMEOUT] [-I] [-M REMOTEOPTION]
       [--size-only] [--modify-window MODIFYWINDOW] [-T TEMPDIR] [-y]
       [--compare-dest COMPAREDEST] [--copy-dest COPYDEST]
       [--link-dest LINKDEST] [-z] [--compress-level COMPRESSLEVEL]
       [--skip-compress SKIPCOMPRESS] [-C] [-f FILTER] [--exclude EXCLUDE]
       [--exclude-from EXCLUDEFROM] [--include INCLUDE]
       [--include-from INCLUDEFROM] [--files-from FILESFROM] [-0] [-s]
       [--address ADDRESS] [--port PORT] [--sockopts SOCKOPTS]
       [--blocking-io] [--stats] [-8] [--human-readable] [--progress] [-i]
       [--out-format OUTFORMAT] [--log-file LOGFILE]
       [--log-file-format LOGFILEFORMAT] [--password-file PASSWORDFILE]
       [--list-only] [--bwlimit BWLIMIT] [--outbuf OUTBUF]
       [--write-batch WRITEBATCH] [--only-write-batch ONLYWRITEBATCH]
       [--read-batch READBATCH] [--protocol PROTOCOL] [--iconv ICONV]
       [--checkum-seed CHECKSUMSEED] [-4] [-6] [--version]
       [--checksum-choice CHECKSUMCHOICE] [-U] [--open-noatime]
       [--write-devices] [--copy-as COPYAS] [--early-input EARLYINPUT]
       [--max-alloc MAXALLOC] [--mkpath] [-N] [--stop-at STOPAT]
       [--stop-after STOPAFTER] [--copy-devices] [--fsync] [--trust-sender]
       [--additional ADDITIONAL]
       [source(s)/destination [source(s)/destination ...]]
```

--------------------------------

### Rsync with Windows Path and Identity

Source: https://fracpete.github.io/rsync4j/java

Demonstrates how to configure rsync on Windows when using the `rsh` option with an identity file. It utilizes `Binaries.sshBinary()` and `Binaries.convertPath()` for correct path construction.

```java
RSync rsync = new RSync()
  .source("C:\\somedir")
  .destination("D:\\otherdir")
  .recursive(true)
  .rsh(Binaries.sshBinary() + " -i " + Binaries.convertPath("C:\\keys\\mykey.pub"));

```

--------------------------------

### SshKeyGen Help Screen

Source: https://fracpete.github.io/rsync4j/commandline

Displays the usage information and all available command-line options for the SshKeyGen tool. This is useful for understanding the full range of functionalities.

```bash
usage: com.github.fracpete.rsync4j.SshKeyGen
       [-h] [--output-commandline] [-A] [-a ROUNDS] [-B] [-b BITS]
       [-C COMMENT] [-D PKCS11] [-E FINGERPRINT] [-e] [-F FINDHOST]
       [-f KEYFILE] [-G CANDIDATEPRIMES] [-g] [-H] [--host] [-i]
       [-J SCREENNUMLINES] [-j SCREENSTARTLINE] [-K SCREENCHECKPOINT] [-k]
       [-L] [-l] [-M MEMORY] [-m KEYFORMAT] [-N NEWPASSPHRASE]
       [-n PRINCIPALS] [-O OPTION] [-o] [-P PASSPHRASE] [-p] [-Q] [-q]
       [-R REMOVEKEYS] [-r PRINTFINGERPRINT] [-S STARTPOINT] [-s SIGNCAKEY]
       [-T TESTCANDIDATEPRIMES] [-t KEYTYPE] [-u] [-V VALIDITYINTERVAL]
       [-v] [-vv] [-vvv] [-W GENERATOR] [-y] [-z SERIALNUMBER]
       [file [file ...]]

Authentication key generation, management and conversion.
See man page:
https://linux.die.net/man/1/ssh-keygen

positional arguments:
  file                   The key file(s).

optional arguments:
  -h, --help             show this help message and exit
  --output-commandline   output the command-line generated  for the wrapped
                         binary
  -A                     For each of the key  types  (rsa1, rsa, dsa, ecdsa
                         and ed25519) for  which  host  keys  do not exist, 
                         generate the host keys  with  the default key file
                         path, an empty  passphrase,  default  bits for the
                         key type, and default comment.
  -a ROUNDS              When saving  a  new-format  private  key  (i.e. an
                         ed25519 key or any SSH protocol  2 key when the -o
                         flag is set), this option  specifies the number of
                         KDF (key derivation function) rounds used.
  -B                     Show the bubblebabble digest  of specified private
                         or public key file.
  -b BITS                Specifies the number of bits in the key to create.
  -C COMMENT             Provides a new comment.
  -D PKCS11              Download the  RSA  public  keys  provided  by  the
                         PKCS#11 shared library pkcs11.
  -E FINGERPRINT         Specifies the hash algorithm  used when displaying
                         key fingerprints.
  -e                     This option will read a  private or public OpenSSH
                         key file and print  to  stdout  the  key in one of
                         the formats specified by the -m option.
  -F FINDHOST            Search   for   the   specified   hostname   in   a
                         known_hosts file, listing any occurrences found.
  -f KEYFILE             Specifies the filename of the key file.
  -G CANDIDATEPRIMES     Generate candidate primes for DH-GEX..
  -g                     Use generic DNS  format  when printing fingerprint
                         resource records using the -r command.
  -H                     Hash a known_hosts file.
  --host                 When signing  a  key,  create  a  host certificate
                         instead of a user certificate.
  -i                     This option will read  an  unencrypted private (or
                         public) key file in the  format specified by the -
                         m option and print  an  OpenSSH compatible private
                         (or public) key to stdout.
  -J SCREENNUMLINES      Exit  after  screening  the  specified  number  of
                         lines  while  performing  DH  candidate  screening
                         using the -T option.
  -j SCREENSTARTLINE     Start  screening  at  the  specified  line  number
                         while performing DH candidate  screening using the
                         -T option.
  -K SCREENCHECKPOINT    Write the last line processed  to the file checkpt
                         while performing DH candidate  screening using the
                         -T option.
  -k                     Generate a KRL file.
  -L                     Prints the contents of one or more certificates.
  -l                     Show fingerprint of specified public key file.
  -M MEMORY              Specify  the  amount   of   memory   to   use  (in
                         megabytes) when  generating  candidate  moduli for
                         DH-GEX.
  -m KEYFORMAT           Specify a key format  for  the  -i  (import) or -e
                         (export) conversion options.
  -N NEWPASSPHRASE       Provides the new passphrase.
  -n PRINCIPALS          Specify one  or  more  principals  (user  or  host
                         names)  to  be  included  in  a  certificate  when
                         signing a key.
  -O OPTION              Specify a certificate option when signing a key.
  -o                     Causes ssh-keygen to save  private  keys using the

```

--------------------------------

### Syncing Between Windows Hosts

Source: https://fracpete.github.io/rsync4j/windows

Synchronize directories between Windows hosts using UNC paths for the remote host. The source path uses Cygwin notation, while the destination path uses a UNC format.

```text
source: /cygdrive/c/some/dir/
```

```text
destination: //otherbox/C$/other/dir
```

--------------------------------

### RSync4j Named Arguments: Help and Output Control

Source: https://fracpete.github.io/rsync4j/commandline

Options for displaying help messages and controlling the output verbosity and format of the rsync process.

```bash
named arguments:
  -h, --help             show this help message and exit
  --output-commandline   output the command-line generated  for the wrapped
                         binary
  -v, --verbose          increase verbosity
  --info INFO            fine-grained informational verbosity
  --debug DEBUG          fine-grained debug verbosity
  --msgs2stderr          special output handling for debugging
  -q, --quiet            suppress non-error messages
  --no-motd              suppress daemon-mode MOTD
```

--------------------------------

### RSync4j Named Arguments: Directory and Symlink Handling

Source: https://fracpete.github.io/rsync4j/commandline

Options for controlling how directories and symbolic links are transferred.

```bash
-d, --dirs             transfer directories without recursing
  -l, --links            copy symlinks as symlinks
  -L, --copy-links       transform symlink into referent file/dir
  --copy-unsafe-links    only "unsafe" symlinks are transformed
  --safe-links           ignore symlinks that point outside the source tree
  --munge-links          munge symlinks to make them safer (but unusable)
  -k, --copy-dirlinks    transform symlink to a dir into referent dir
  -K, --keep-dirlinks    treat symlinked dir on receiver as dir
```

--------------------------------

### Add rsync4j for Windows64 Support

Source: https://fracpete.github.io/rsync4j/maven

Include this dependency in your pom.xml for native Windows64 support. Ensure the version matches your project's requirements.

```xml
    <dependency>
      <groupId>com.github.fracpete</groupId>
      <artifactId>rsync4j-windows64</artifactId>
      <version>3.3.0-7</version>
    </dependency>

```

--------------------------------

### RSync4j Named Arguments: Backup and Update Options

Source: https://fracpete.github.io/rsync4j/commandline

Options for managing backups of transferred files and controlling updates based on file modification times.

```bash
-b, --backup           make backups (see --suffix & --backup-dir)
  --backup-dir BACKUPDIR
                         make backups into hierarchy based in DIR
  --suffix SUFFIX        set backup suffix (default ~ w/o --backup-dir)
  -u, --update           skip files that are newer on the receiver
```

--------------------------------

### Rsync4j Ssh Tool Usage

Source: https://fracpete.github.io/rsync4j/commandline

This is the main usage help screen for the Rsync4j Ssh tool. It lists all available command-line options and their descriptions.

```bash
usage: com.github.fracpete.rsync4j.Ssh
       [-h] [--output-commandline] [--maxtime MAXTIME] [-1] [-2] [-4]
       [-6] [-A] [-a] [-b BINDADDRESS] [-C] [-c CIPHERSPEC]
       [-D DYNAMICBINDADDRESS] [-E LOGFILE] [-e ESCAPECHAR] [-F CONFIGFILE]
       [-f] [-G] [-g] [-I PKCS11] [-K] [-k] [-L LOCAL] [-l LOGINNAME] [-M]
       [-m MACSPEC] [-N] [-n] [-O CONTROLCOMMAND] [-o OPTION] [-p PORT]
       [-q] [-R REMOTE] [-s] [-T] [-t] [-v] [-vv] [-vvv] [-W FORWARDTO]
       [-w FORWARDTUNNEL] [-X] [-x] [-Y] [-y] hostname  [command]

OpenSSH  SSH  client  (remote  login   program).  No  interactive  sessions
possible.
See man page:
https://linux.die.net/man/1/ssh

positional arguments:
  hostname               The hostname to connect to.
                         The hostname to connect to.
  command                The remote command to execute.

optional arguments:
  -h, --help             show this help message and exit
  --output-commandline   output the command-line generated  for the wrapped
                         binary
  --maxtime MAXTIME      set the maximum time  for  the  process  to run in
                         seconds before getting killed
  -1                     Forces ssh to try protocol version 1 only.
  -2                     Forces ssh to try protocol version 2 only.
  -4                     Forces ssh to use IPv4 addresses only.
  -6                     Forces ssh to use IPv6 addresses only.
  -A                     Enables forwarding  of  the  authentication  agent
                         connection.
  -a                     Disables forwarding  of  the  authentication agent
                         connection.
  -b BINDADDRESS         Use bind_address  on  the  local  machine  as  the
                         source address of the connection.
  -C                     Requests compression of all data.
  -c CIPHERSPEC          Selects the  cipher  specification  for encrypting
                         the session.
  -D DYNAMICBINDADDRESS  Specifies  a  local   “dynamic”  application-level
                         port forwarding ([bind_address:]port).
  -E LOGFILE             Append debug logs to  log_file instead of standard
                         error.
  -e ESCAPECHAR          Sets the escape character for  sessions with a pty
                         (default: ‘~’).
  -F CONFIGFILE          Specifies an  alternative  per-user  configuration
                         file.
  -f                     Requests ssh  to  go  to  background  just  before
                         command execution.
  -G                     Causes  ssh  to  print   its  configuration  after
                         evaluating Host and Match blocks and exit.
  -g                     Allows remote hosts to  connect to local forwarded
                         ports
  -I PKCS11              Specify the PKCS#11 shared  library ssh should use
                         to communicate with a  PKCS#11 token providing the
                         user's private RSA key.
  -K                     Enables    GSSAPI-based     authentication     and
                         forwarding (delegation) of  GSSAPI  credentials to
                         the server.
  -k                     Disables   forwarding   (delegation)   of   GSSAPI
                         credentials to the server.
  -L LOCAL               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.
  -l LOGINNAME           Specifies the user  to  log  in  as  on the remote
                         machine.
  -M                     Places the  ssh  client  into  “master”  mode  for
                         connection sharing.
  -m MACSPEC             A   comma-separated   list    of    MAC   (message
                         authentication  code)  algorithms,   specified  in
                         order of preference.
  -N                     Do not execute a  remote  command.  This is useful
                         for just forwarding ports.
  -n                     Redirects   stdin   from    /dev/null   (actually,
                         prevents reading from stdin).
  -O CONTROLCOMMAND      Control an active  connection  multiplexing master
                         process.
  -o OPTION              Can be used to give options  in the format used in
                         the configuration file.
  -p PORT                Port to connect to on the remote host.
  -q                     Quiet mode.  Causes  most  warning  and diagnostic
                         messages to be suppressed.
  -R REMOTE              Specifies that connections to  the  given TCP port
```

--------------------------------

### Rsync with Multiple Sources (List)

Source: https://fracpete.github.io/rsync4j/java

Configures an rsync command to synchronize multiple source directories specified as a `java.util.List<String>`. This provides flexibility in how source paths are managed.

```java
List<String> s = new ArrayList<>();
s.add("/first/place");
s.add("/second/place");

RSync rsync = new RSync()
  .sources(s)
  .destination("/other/place/")
  .recursive(true)
  .verbose(true);

```

--------------------------------

### Using SSH with rsync4j

Source: https://fracpete.github.io/rsync4j/windows

To use SSH instead of the plain protocol, supply 'ssh' as the remote shell. This can be done in Java code via rsh() or on the command line using --rsh=ssh.

```java
rsh("ssh")
```

--------------------------------

### Execute Rsync with Custom Output Processing

Source: https://fracpete.github.io/rsync4j/java

Executes an rsync command and processes its stdout and stderr line by line using a custom `StreamingProcessOwner` implementation. This allows for granular control over how output is handled during execution.

```java
import com.github.fracpete.rsync4j.RSync;
import com.github.fracpete.processoutput4j.core.StreamingProcessOutputType;
import com.github.fracpete.processoutput4j.core.StreamingProcessOwner;
import com.github.fracpete.processoutput4j.output.StreamingProcessOutput;

public static class Output implements StreamingProcessOwner {
  public StreamingProcessOutputType getOutputType() {
    return StreamingProcessOutputType.BOTH;
  }
  public void processOutput(String line, boolean stdout) {
    System.out.println((stdout ? "[OUT] " : "[ERR] ") + line);
  }
}

... 
RSync rsync = new RSync()
  .source("/one/place/")
  .destination("/other/place/")
  .recursive(true)
  .verbose(true);
StreamingProcessOutput output = new StreamingProcessOutput(new Output());
output.monitor(rsync.builder());

```

--------------------------------

### Rsync with Multiple Sources (Array)

Source: https://fracpete.github.io/rsync4j/java

Configures an rsync command to synchronize multiple source directories specified as a String array. Ensure all paths are correctly formatted for the operating system.

```java
String[] s = new String[]{
  "/first/place/", 
  "/second/place/",
};

RSync rsync = new RSync()
  .sources(s)
  .destination("/other/place/")
  .recursive(true)
  .verbose(true);

```

--------------------------------

### Execute Rsync and Monitor Console Output

Source: https://fracpete.github.io/rsync4j/java

Configures and executes an rsync command, streaming stdout and stderr directly to the console as they occur. This is useful for real-time feedback during long-running rsync operations.

```java
import com.github.fracpete.rsync4j.RSync;
import com.github.fracpete.processoutput4j.output.ConsoleOutputProcessOutput;
...
RSync rsync = new RSync()
  .source("/one/place/")
  .destination("/other/place/")
  .archive(true)
  .delete(true);
ConsoleOutputProcessOutput output = new ConsoleOutputProcessOutput();
output.monitor(rsync.builder());

```

--------------------------------

### Execute Rsync and Collect Output

Source: https://fracpete.github.io/rsync4j/java

Configures and executes an rsync command, collecting all stdout and stderr after the process completes. Use this when you need the full output after the rsync operation finishes.

```java
import com.github.fracpete.rsync4j.RSync;
import com.github.fracpete.processoutput4j.output.CollectingProcessOutput;
...
RSync rsync = new RSync()
  .source("/one/place/")
  .destination("/other/place/")
  .recursive(true);
// or if you prefer using commandline options:
// rsync.setOptions(new String[]{" -r", "/one/place/", "/other/place/"});
CollectingProcessOutput output = rsync.execute();
System.out.println(output.getStdOut());
System.out.println("Exit code: " + output.getExitCode());
if (output.getExitCode() > 0)
  System.err.println(output.getStdErr());

```

--------------------------------

### Execute Remote Command via SSH

Source: https://fracpete.github.io/rsync4j/java

Use the Ssh class to execute commands on a remote host. Configure verbose output and command line logging.

```java
import com.github.fracpete.rsync4j.Ssh;
import com.github.fracpete.processoutput4j.output.ConsoleOutputProcessOutput;
...
Ssh ssh = new Ssh()
  .outputCommandline(true)
  .verbose(1)
  .hostname("localhost")
  .command("ls /tmp");
ConsoleOutputProcessOutput output = new ConsoleOutputProcessOutput();
output.monitor(ssh.builder());

```

--------------------------------

### Generate SSH Key with SshKeyGen

Source: https://fracpete.github.io/rsync4j/java

Generate an SSH key file using SshKeyGen. Specify key type, file path, and comment. Outputs the key's bubble babble representation.

```java
import com.github.fracpete.rsync4j.SshKeyGen;
import com.github.fracpete.processoutput4j.output.ConsoleOutputProcessOutput;
...
SshKeyGen keygen = new SshKeyGen()
  .outputCommandline(true)
  .verbose(1)
  .keyType("dsa")
  .newPassPhrase("")
  .comment("test key")
  .keyFile("~/testkey");
ConsoleOutputProcessOutput output = new ConsoleOutputProcessOutput();
output.monitor(keygen.builder());

```

--------------------------------

### Specify SSH Identity File with rsync

Source: https://fracpete.github.io/rsync4j/faq

Use the `--rsh` option with `ssh -i` to specify a particular private key file for authentication. This is useful when you need to use a key pair other than the default.

```bash
rsync --rsh="ssh -i /some/where/id_rsa" ...
```

--------------------------------

### RSync4j Positional Arguments

Source: https://fracpete.github.io/rsync4j/commandline

Defines the source and destination paths for the rsync operation. The last argument is the target destination, and all preceding arguments are sources.

```bash
positional arguments:
  source(s)/destination  Multiple local/remote paths  (path or [user@]host:
                         path), with the last one  being the target and the
                         others the source(s).
```

--------------------------------

### RSync4j Named Arguments: In-Place and Append Transfer

Source: https://fracpete.github.io/rsync4j/commandline

Options for updating files directly in place or appending data to existing files.

```bash
--inplace              update destination files in-place
  --append               append data onto shorter files
  --append-verify        like --append, but with old data in file checksum
```

--------------------------------

### RSync4j Named Arguments: Metadata Preservation

Source: https://fracpete.github.io/rsync4j/commandline

Options for preserving file metadata such as hard links, permissions, and ownership during transfer.

```bash
-H, --hard-links       preserve hard links
  -p, --perms            preserve permissions
```

--------------------------------

### RSync4j Named Arguments: File Transfer Control

Source: https://fracpete.github.io/rsync4j/commandline

Options that dictate how files are compared and transferred, including checksum usage, archive mode, and recursion.

```bash
-c, --checksum         skip based on checksum, not mod-time & size
  -a, --archive          archive mode; equals -rlptgoD (no -H,-A,-X)
  -r, --recursive        recurse into directories
  -R, --relative         use relative path names
  --no-implied-dirs      use relative path names
```

--------------------------------

### SSH Connection with Password Authentication

Source: https://fracpete.github.io/rsync4j/java

Connect to a remote host using password authentication via SshPass. This is an alternative when SSH keys are not feasible. Configure SSH options like host key checking.

```java
import com.github.fracpete.rsync4j.Ssh;
import com.github.fracpete.rsync4j.SshPass;
import com.github.fracpete.processoutput4j.output.ConsoleOutputProcessOutput;
...
SshPass sshpass = new SshPass()
  .password("mysecretpassword");
Ssh ssh = new Ssh()
  .sshPass(sshpass)
  .option("StrictHostKeyChecking=no")
  .hostname("username@remote.host.com")
  .command("ls /tmp");
ConsoleOutputProcessOutput output = new ConsoleOutputProcessOutput();
output.monitor(ssh.builder());

```

--------------------------------

### Suppress SSH Host Key Checking

Source: https://fracpete.github.io/rsync4j/faq

To avoid the prompt for accepting a remote host's fingerprint, include `StrictHostKeyChecking=no` in the SSH options passed via the `-o` flag. This is often used in automated scripts.

```bash
ssh -o StrictHostKeyChecking=no ...
```
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