### Script Example for fw_setenv

Source: https://github.com/sbabic/libubootenv/blob/master/README.md

An example of a script file that can be used with fw_setenv to set environment variables.

```bash
Script Example:
 netdev=eth0
 kernel_addr=400000
 foo=empty empty empty    empty empty empty
 bar
```

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

### Script Syntax for fw_setenv

Source: https://github.com/sbabic/libubootenv/blob/master/README.md

Defines the syntax for script files used with fw_setenv. Lines with '=' are treated as key-value pairs, comments start with '#', and lines without '=' are ignored.

```bash
Script Syntax:
 key=value
 lines starting with '#' are treated as comment
 lines without '=' are ignored
```

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

### YAML Configuration for U-Boot Environment

Source: https://github.com/sbabic/libubootenv/blob/master/docs/fw_env_config.md

Defines U-Boot environment settings including size, lock file, writelist, and device paths. Use this for U-Boot specific environment configurations.

```yaml
uboot:
  size : 0x4000
  lockfile : /var/lock/fw_printenv.lock
  writelist:
    - var1:sw
    - var2:sw
    - var3:dw
  devices:
    - path : /dev/mtd0
      offset : 0xA0000
      sectorsize : 0x10000
      unlock : yes
    - path : /dev/mtd0
      offset : 0xB0000
      sectorsize : 0x10000
      disablelock : yes

appvar:
  size : 0x4000
  lockfile : /var/lock/appvar.lock

  devices:
    - path : /dev/mtd1
      offset : 0
      sectorsize : 0x10000
      unlock : yes
    - path : /dev/mtd1
      offset : 0x10000
      sectorsize : 0x10000
```

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

### fw_printenv Usage

Source: https://github.com/sbabic/libubootenv/blob/master/README.md

Command-line options for fw_printenv. Use -c to specify a configuration file and -f to provide a default environment if none is found on persistent storage.

```bash
Usage fw_printenv [OPTION]
 -h,                              : print this help
 -c, --config <filename>          : configuration file (by default: /etc/fw_env.config)
 -f, --defenv <filename>          : default environment if no one found (by default: /etc/u-boot-initial-env)
 -V,                              : print version and exit
 -n, --no-header                  : do not print variable name
```

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

### fw_setenv Usage

Source: https://github.com/sbabic/libubootenv/blob/master/README.md

Command-line options for fw_setenv. Use -c for configuration, -f for a default environment, and -s to read variables from a script file.

```bash
Usage fw_setenv [OPTION]
 -h,                              : print this help
 -c, --config <filename>          : configuration file (by default: /etc/fw_env.config)
 -f, --defenv <filename>          : default environment if no one found (by default: /etc/u-boot-initial-env)
 -V,                              : print version and exit
 -s, --script <filename>          : read variables to be set from a script
```

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