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2014년 5월 18일 일요일

kali linux gpg error 칼리 리눅스 gpg 에러

kali linux gpg error 칼리 리눅스 gpg 에러

에러 발생시 다음과 같이 조치 하면 진행 된다.

gpg --keyserver --recv-key  ED444FF07D8D0BF6

gpg -a --export ED444FF07D8D0BF6 | sudo apt-key add -

지속적으로 문제 발생시 gpg키 삭제후 재시도 해본다.

2014년 5월 17일 토요일

debian source list add backtack

If you are not familiar with piping this is what this long string of command means:

1. wget

2. sudo apt-key add backtrack.gpg

wget -O -

This means download backtrack.gpg and output to stdout (standard output stream)

sudo apt-key add -

This means add apt-key from the stdin (standard input stream)

wget -O – | sudo apt-key add -

Add the repositories

Edit the file /etc/apt/sources.list with your favourite text editor.

deb revolution main microverse non-free testing
deb revolution main microverse non-free testing
deb revolution main microverse non-free testing

2014년 5월 6일 화요일

freebsd x60 /etc/ 설정 파일


#vesa mode
allscreens_flags="-g 132x60 MODE_280"
#host mode

# wireless
ifconfig_wlan0="WPA DHCP"

#ssh server

# power saving

# Set dumpdev to "AUTO" to enable crash dumps, "NO" to disable

# disable sendmail

# trackpad scrolling

# auto usb hdd mount


# $FreeBSD: release/10.0.0/etc/sysctl.conf 112200 2003-03-13 18:43:50Z mux $
#  This file is read when going to multi-user and its contents piped thru
#  ``sysctl'' to adjust kernel values.  ``man 5 sysctl.conf'' for details.

# Uncomment this to prevent users from seeing information about processes that
# are being run under another UID.

 #대기 모드 진입 금지 옵션

# 크롬 실행 위한 설정



# enable ThinkPad buttons

# allow regular users to mount removable devices

# disable speaker beep

2014년 5월 1일 목요일

리눅스 매직 키

Using the Magic SysRq Key

The SysRq key is located near the Scroll Lock key on your keyboard – the Sys Rq key is generally the same as your Print Screen key. The “magic” SysRq combination is Alt+SysRq.

To use this key combination, your Linux kernel must have been compiled with the CONFIG_MAGIC_SYSRQ compile option – most Linux distributions will have this enabled by default. Assuming it’s compiled into your kernel, it can be enabled or disabled on a running system by changing the value of /proc/sys/kernel/sysrq. To check if it’s enabled, run the following command:

    cat /proc/sys/kernel/sysrq

If you see a “1”, the magic SysRq key is enabled.


If you see a “0”, you’ll have to enable it yourself by running the following command as root:

    echo “1” > /proc/sys/kernel/sysrq

Dealing With a Frozen X Server

If your X server (the program that runs your graphical desktop) freezes, you may find yourself unable to use your system. There are a few magic SysRq commands that can help:

    Alt + SysRq + r – Takes the keyboard out of raw mode, taking control away from the X server. After running this combination, you should be able to use the Ctrl + Alt + F1 (and other F-key) keyboard shortcuts to switch to another console and restart X.
    Alt + SysRq + k – Kills all programs on the current virtual console, including X. You can also enable the Ctrl+Alt+Backspace keyboard shortcut in Ubuntu’s keyboard preferences to restart your X server – however, this shortcut is implemented by the X server and may not always work.

Cleanly Restarting Your System

Used in sequence, some of these actions can be used to cleanly end processes, flush data to disk, unmount all file systems, and restart your computer. To perform this process, press and hold the Alt + SysRq key combination and – while holding the Alt and SysRq keys down — type the following keys in order, pausing for several seconds in between each key:


The mnemonic “Raising Elephants Is So Utterly Boring” is often used to remember this sequence. Here’s what each key does:

    r – Puts the keyboard into raw mode, taking control of it away from the X server.
    e – Sends the terminate signal to all processes, asking them to end gracefully.
    i – Sends the kill signal to all processes, forcing them to end immediately.
    s – Flushes data from your cache to disk.
    u – Remounts all file systems read-only.
    b – Reboots your computer.

More Commands

Here are some other actions you can perform with the magic SysRq key. To perform an action, press and hold the Alt + SysRq keys while typing the letter:

    n – Resets the nice level (priority) of all high and realtime priority processes.
    f – Calls oom_kill, which will kill a memory-hogging process.
    o – Shuts off the computer.

There are other actions, but they may be more useful to developers than the average Linux geek. For more information on the magic SysRq key – and a full list of actions you can perform – consult the sysrq.txt file included with the Linux kernel.

freebsd magic key

* How do I use the magic SysRQ key? ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ On x86 - You press the key combo 'ALT-SysRQ-<command key>'. Note - Some (older?) may not have a key labeled 'SysRQ'. The 'SysRQ' key is also known as the 'Print Screen' key.

On SPARC - You press 'ALT-STOP-<command key>', I believe.

On PowerPC - You press 'ALT-Print Screen-<command key>'.

On other - If you know of the key combos for other architectures, please let me know so I can add them to this section.

* What are the 'command' keys? ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 'r' - Turns off keyboard raw mode and sets it to XLATE.

'k' - Kills all programs on the current virtual console.

'b' - Will immediately reboot the system without syncing or unmounting your disks.

'o' - Will shut your system off (if configured and supported).

's' - Will attempt to sync all mounted filesystems.

'u' - Will attempt to remount all mounted filesystems read-only.

'p' - Will dump the current registers and flags to your console.

't' - Will dump a list of current tasks and their information to your console.

'm' - Will dump current memory info to your console.

'0'-'9' - Sets the console log level, controlling which kernel messages will be printed to your console. ('0', for example would make it so that only emergency messages like PANICs or OOPSes would make it to your console.)

'e' - Send a SIGTERM to all processes, except for init.

'i' - Send a SIGKILL to all processes, except for init.

'l' - Send a SIGKILL to all processes, INCLUDING init. (Your system will be non-functional after this.)

* Okay, so what can I use them for?

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