구차니의 잡동사니 모음

$ echo 11 > /sys/class/gpio/export 

$ echo out > /sys/class/gpio/gpio11/direction

$ echo 1 > /sys/class/gpio/gpio11/value

$ echo 0 > /sys/class/gpio/gpio11/value

$ echo 11 > /sys/class/gpio/unexport  

stty -speed 19200 -f /dev/ttyS1

echo -ne '\033[2J' > /dev/ttyS1

cat -v < /dev/ttyS1 

# stty --help

BusyBox v1.20.2 (2015-12-21 15:35:08 KST) multi-call binary.

Usage: stty [-a|g] [-F DEVICE] [SETTING]...

Without arguments, prints baud rate, line discipline,

and deviations from stty sane

        -F DEVICE       Open device instead of stdin

        -a              Print all current settings in human-readable form

        -g              Print in stty-readable form

        [SETTING]       See manpage 

# stty -a -F /dev/ttyAMA2

speed 9600 baud;stty: /dev/ttyAMA2

 line = 0;

intr = ^C; quit = ^\; erase = ^?; kill = ^U; eof = ^D; eol = <undef>;

eol2 = <undef>; swtch = <undef>; start = ^Q; stop = ^S; susp = ^Z; rprnt = ^R;

werase = ^W; lnext = ^V; flush = ^O; min = 1; time = 0;

-parenb -parodd cs8 hupcl -cstopb cread clocal -crtscts

-ignbrk -brkint -ignpar -parmrk -inpck -istrip -inlcr -igncr icrnl ixon -ixoff

-iuclc -ixany -imaxbel -iutf8

opost -olcuc -ocrnl onlcr -onocr -onlret -ofill -ofdel nl0 cr0 tab0 bs0 vt0 ff0

isig icanon iexten echo echoe echok -echonl -noflsh -xcase -tostop -echoprt

echoctl echoke 

# stty -F /dev/ttyAMA2 speed 115200

9600 

# stty -a -F /dev/ttyAMA2

speed 115200 baud;stty: /dev/ttyAMA2

 line = 0;

intr = ^C; quit = ^\; erase = ^?; kill = ^U; eof = ^D; eol = <undef>;

eol2 = <undef>; swtch = <undef>; start = ^Q; stop = ^S; susp = ^Z; rprnt = ^R;

werase = ^W; lnext = ^V; flush = ^O; min = 1; time = 0;

-parenb -parodd cs8 hupcl -cstopb cread clocal -crtscts

-ignbrk -brkint -ignpar -parmrk -inpck -istrip -inlcr -igncr icrnl ixon -ixoff

-iuclc -ixany -imaxbel -iutf8

opost -olcuc -ocrnl onlcr -onocr -onlret -ofill -ofdel nl0 cr0 tab0 bs0 vt0 ff0

isig icanon iexten echo echoe echok -echonl -noflsh -xcase -tostop -echoprt

echoctl echoke 

# stty -F /dev/ttyAMA2 min 0 time 10 

$ cat /etc/fail2ban/action.d/iptables-multiport24.conf

actionban = iptables -I fail2ban-<name> 1 -s <ip>/24 -j <blocktype>

            echo <ip> >> /etc/fail2ban/ip.blacklist 

$ cpulimit

Error: You must specify a target process

CPUlimit version 2.1

Usage: cpulimit TARGET [OPTIONS...] [-- PROGRAM]

   TARGET must be exactly one of these:

      -p, --pid=N        pid of the process

      -e, --exe=FILE     name of the executable program file

                         The -e option only works when

                         cpulimit is run with admin rights.

      -P, --path=PATH    absolute path name of the

                         executable program file

   OPTIONS

      -b  --background   run in background

      -c  --cpu=N        override the detection of CPUs on the machine.

      -l, --limit=N      percentage of cpu allowed from 1 up.

                         Usually 1 - 400, but can be higher

                         on multi-core CPUs (mandatory)

      -q, --quiet        run in quiet mode (only print errors).

      -k, --kill         kill processes going over their limit

                         instead of just throttling them.

      -r, --restore      Restore processes after they have

                         been killed. Works with the -k flag.

      -s, --signal=SIG   Send this signal to the watched process when cpulimit exits.

                         Signal should be specificed as a number or

                         SIGTERM, SIGCONT, SIGSTOP, etc. SIGCONT is the default.

      -v, --verbose      show control statistics

      -z, --lazy         exit if there is no suitable target process,

                         or if it dies

          --             This is the final CPUlimit option. All following

                         options are for another program we will launch.

      -h, --help         display this help and exit 

<item>

core

limits the core file size (KB)

data

maximum data size (KB)

fsize

maximum filesize (KB)

memlock

maximum locked-in-memory address space (KB)

nofile

maximum number of open files

rss

maximum resident set size (KB) (Ignored in Linux 2.4.30 and higher)

stack

maximum stack size (KB)

cpu

maximum CPU time (minutes)

nproc

maximum number of processes

as

address space limit (KB)

maxlogins

maximum number of logins for this user except for this with uid=0

maxsyslogins

maximum number of all logins on system

priority

the priority to run user process with (negative values boost process priority)

locks

maximum locked files (Linux 2.4 and higher)

sigpending

maximum number of pending signals (Linux 2.6 and higher)

msgqueue

maximum memory used by POSIX message queues (bytes) (Linux 2.6 and higher)

nice

maximum nice priority allowed to raise to (Linux 2.6.12 and higher) values: [-20,19]

rtprio

maximum realtime priority allowed for non-privileged processes (Linux 2.6.12 and higher)