“vcgencmd” is a useful command on Raspberry Pi provided by Raspbian.

By taking advantage of this command, users can easily get the temperature of Pi, check the frequency of CPU and etc. There’re many options for this command but it lacks a bash completion script. So I wrote one based on the document by elinux.

Here it is. Place it under /etc/bash_completion.d/. (Download: vcgencmd-complete.zip)

_vcgencmd () {
    local cur prev commands opts_clock opts_volts opts_codec opts_config opts_mem opts_display
    commands=$(vcgencmd commands)
    commands=${commands:10:${#commands}-11}
    commands="${commands//,} commands"
    opts_clock="arm core h264 isp v3d uart pwm emmc pixel vec hdmi dpi "
    opts_clock="45  1    28   42  43  22   25  47   29    10  9    4 ""$opts_clock"
    opts_volts="core sdram_c sdram_i sdram_p"
    opts_codec="H264 MPG2 WVC1 MJPG WMV9"
    opts_config="int str
        arm_freq
        config_hdmi_boost
        core_freq
        disable_commandline_tags
        disable_l2cache
        emmc_pll_core
        force_eeprom_read
        force_pwm_open
        framebuffer_ignore_alpha
        framebuffer_swap
        hdmi_force_cec_address
        over_voltage
        over_voltage_avs
        overscan_bottom
        overscan_left
        overscan_right
        overscan_top
        pause_burst_frames
        program_serial_random
        sdram_freq
        temp_limit"
    opts_mem="arm gpu"
    opts_display="0 1"

    COMPREPLY=()
    cur=$(_get_cword)
    prev=${COMP_WORDS[COMP_CWORD-1]}

    case "$prev" in
        "vcgencmd")
            COMPREPLY=($(compgen -W "$commands" "$cur"))
            ;;
        "measure_clock")
            COMPREPLY=($(compgen -W "$opts_clock" "$cur"))
            ;;
        "measure_volts")
            COMPREPLY=($(compgen -W "$opts_volts" "$cur"))
            ;;
        "codec_enabled")
            COMPREPLY=($(compgen -W "$opts_codec" "$cur"))
            ;;
        "get_config")
            COMPREPLY=($(compgen -W "$opts_config" "$cur"))
            ;;
        "get_mem")
            COMPREPLY=($(compgen -W "$opts_mem" "$cur"))
            ;;
        "display_power")
            COMPREPLY=($(compgen -W "$opts_display" "$cur"))
            ;;
    esac

    return 0
}
complete -F _vcgencmd vcgencmd