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SYNOPSIS
       logger [options] message

DESCRIPTION
       logger makes entries in the system log.

       When the optional message argument is present, it is written to the log. If it is not present, and the -f option is not given either, then standard input is logged.

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$ echo eb3ae38f27191aa5f3850dc9cad00492b88b72404f9da135698679268041c54a \
  | fold -w2 | tac | tr -d "\n"
4ac541802679866935a19d4f40728bb89204d0cac90d85f3a51a19278fe33aeb

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printf "%d\n" 0x1234 # 得到 4660
printf "%x\n" 123212 # 得到 1e14c

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$ python -c "print(bin(int('111', 16)))"
0b100010001
$ python -c "print(hex(int('111', 2)))"
0x7
$ python -c "print(hex(int('111', 8)))"
0x49

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root@Mufasa:/home/exec/my-flake/ > ls -ahl /sys/bus/pci/rescan
--w------- 1 root root 4.0K Jul 22 08:52 /sys/bus/pci/rescan

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waitpid --help

Usage:
 waitpid [options] pid...

Options:
 -v, --verbose           be more verbose
 -t, --timeout=<timeout> wait at most timeout seconds
 -e, --exited            allow exited PIDs
 -c, --count=<count>     number of process exits to wait for

 -h, --help              display this help
 -V, --version           display version

For more details see waitpid(1).

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       -f, --follow[={name|descriptor}]
              output appended data as the file grows;

              an absent option argument means 'descriptor'

       -F     same as --follow=name --retry

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tail -f data/logs/run.log | grep "block: " | pv -l > /dev/null

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sudo renice -n -20 -p [pid]

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sudo renice -n -20 -g [pid]

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OPTIONS
       -n, --priority priority
           Specify the scheduling priority to be used for the process, process group, or user. Use of the option -n or --priority is
           optional, but when used it must be the first argument.

       -g, --pgrp
           Interpret the succeeding arguments as process group IDs.

       -p, --pid
           Interpret the succeeding arguments as process IDs (the default).

       -u, --user
           Interpret the succeeding arguments as usernames or UIDs.

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$ qdbus org.kde.KWin /Compositor | grep method
method void org.kde.kwin.Compositing.resume()
method void org.kde.kwin.Compositing.suspend()

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❯ ps -eF | grep -i 71435
exec       71435    6343  0 178062 4384   8 10:06 pts/21   00:00:00 vagrant ssh
exec       71443   71435  0  3866  6396   5 10:06 pts/21   00:00:01 /usr/bin/ssh [email protected] -p 2222 -o LogLevel=FATAL -o Compression=yes -o DSAAuthentication=yes -o IdentitiesOnly=yes -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -i /home/exec/Projects/github.com/eval-exec/ebpf-practice/.vagrant/machines/default/virtualbox/private_key

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function mygrep(){
        read -r headline < /dev/stdin
        echo ${headline}
        grep "$@"
}

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❯ ps -eF | mygrep -i $(pidof vagrant)
UID          PID    PPID  C    SZ   RSS PSR STIME TTY          TIME CMD
exec       71435    6343  0 178062 4384   8 10:06 pts/21   00:00:00 vagrant ssh
exec       71443   71435  0  3866  6396   5 10:06 pts/21   00:00:01 /usr/bin/ssh [email protected] -p 2222 -o LogLevel=FATAL -o Compression=yes -o DSAAuthentication=yes -o IdentitiesOnly=yes -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -i /home/exec/Projects/github.com/eval-exec/ebpf-practice/.vagrant/machines/default/virtualbox/private_key

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man rmdir
NAME
       rmdir - remove empty directories

SYNOPSIS
       rmdir [OPTION]... DIRECTORY...

DESCRIPTION
       Remove the DIRECTORY(ies), if they are empty.

       --ignore-fail-on-non-empty
              ignore each failure that is solely because a directory is non-empty

       -p, --parents
              remove DIRECTORY and its ancestors; e.g., 'rmdir -p a/b/c' is similar to 'rmdir a/b/c a/b a'

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find . -type d -empty -delete

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❯ google-chrome-stable
[62820:62820:0513/165342.261311:ERROR:vaapi_wrapper.cc(1136)] vaQuerySurfaceAttributes failed, VA error: invalid parameter
[62820:62820:0513/165342.261383:ERROR:vaapi_wrapper.cc(1083)] FillProfileInfo_Locked failed for va_profile VAProfileH264Main and entrypoint VAEntrypointVLD
[62820:62820:0513/165342.261421:ERROR:vaapi_wrapper.cc(1136)] vaQuerySurfaceAttributes failed, VA error: invalid parameter
[62820:62820:0513/165342.261452:ERROR:vaapi_wrapper.cc(1083)] FillProfileInfo_Locked failed for va_profile VAProfileH264High and entrypoint VAEntrypointVLD

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❯ vainfo
vainfo: VA-API version: 1.14 (libva 2.14.0)
vainfo: Driver version: Splitted-Desktop Systems VDPAU backend for VA-API - 0.7.4
vainfo: Supported profile and entrypoints
      VAProfileMPEG2Simple            : VAEntrypointVLD
      VAProfileMPEG2Main              : VAEntrypointVLD
      VAProfileMPEG4Simple            : VAEntrypointVLD
      VAProfileMPEG4AdvancedSimple    : VAEntrypointVLD
      <unknown profile>               : VAEntrypointVLD
      VAProfileH264Main               : VAEntrypointVLD
      VAProfileH264High               : VAEntrypointVLD
      VAProfileVC1Simple              : VAEntrypointVLD
      VAProfileVC1Main                : VAEntrypointVLD
      VAProfileVC1Advanced            : VAEntrypointVLD

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  yay -S libva-vdpau-driver-chromium
  # note: Installing libva-vdpau-driver-chromium will remove: libva-vdpau-driver

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 ❯ vainfo
  vainfo: VA-API version: 1.14 (libva 2.14.0)
  vainfo: Driver version: Splitted-Desktop Systems VDPAU backend for VA-API - 0.7.4
  vainfo: Supported profile and entrypoints
  VAProfileMPEG2Simple            : VAEntrypointVLD
  VAProfileMPEG2Main              : VAEntrypointVLD
  VAProfileMPEG4Simple            : VAEntrypointVLD
  VAProfileMPEG4AdvancedSimple    : VAEntrypointVLD
  VAProfileH264Main               : VAEntrypointVLD
  VAProfileH264High               : VAEntrypointVLD
  VAProfileVC1Simple              : VAEntrypointVLD
  VAProfileVC1Main                : VAEntrypointVLD
  VAProfileVC1Advanced            : VAEntrypointVLD

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  faillock --user ${USER} --reset

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ci" - change inside double quotes

ci) - change inside curved brackets

ci} - change inside curly brackets

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  ❯ docker run -d --rm --net="host" --name mymongo -e MONGO_INITDB_ROOT_USERNAME=root -e MONGO_INITDB_ROOT_PASSWORD=123456 mongo:5.0.0
  e7cd5c86843ddb2fe6e1b96e24702f193bf319ffc5f667f1728bff1f7fb18d6e
  ❯ ps aux | grep -i mongod
  999      1015717 21.3  0.1 1534516 105496 ?      Ssl  16:11   0:00 mongod --auth --bind_ip_all
  exec     1016018  0.0  0.0   9760  2436 pts/74   S+   16:11   0:00 grep --color=auto --exclude-dir=.bzr --exclude-dir=CVS --exclude-dir=.git --exclude-dir=.hg --exclude-dir=.svn --exclude-dir=.idea --exclude-dir=.tox -i mongod
  ❯ cat /proc/$(pidof mongod)/cgroup
  0::/system.slice/docker-e7cd5c86843ddb2fe6e1b96e24702f193bf319ffc5f667f1728bff1f7fb18d6e.scope
  ❯ docker ps
  CONTAINER ID   IMAGE         COMMAND                  CREATED         STATUS         PORTS     NAMES
  e7cd5c86843d   mongo:5.0.0   "docker-entrypoint.s…"   2 minutes ago   Up 2 minutes             mymongo

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MAX_PROCESS=14
parallelCount=0
for endBlock in $(seq 10000 -1000 1); do
  ${EXPORT_CLI} &>> export.log &
  if [ ${parallelCount} -eq ${MAX_PROCESS} ]; then
    wait
    parallelCount=0
  fi
done
wait

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function run_export_trace(){
  block=$1
  export_cli=$2
  ${export_cli} &>> export.log
}
export -f run_export_trace
seq 14340000 -${STEP} 1 | xargs -i --max-procs ${MAX_PROCESS} bash -c  "run_export_trace {} ${EXPORT_CLI}"

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❯ fuser -m /run/media/exec/vax/ -v
                     USER        PID ACCESS COMMAND
/run/media/exec/vax: root     kernel mount /run/media/exec/vax
                     exec      269858 ..c.. zsh
                     exec      269933 f...m gitstatusd-linu
❯ fuser -m /run/media/exec/vax/ -v
                     USER        PID ACCESS COMMAND
/run/media/exec/vax: root     kernel mount /run/media/exec/vax
                     exec      269933 f...m gitstatusd-linu
❯ fuser -m /run/media/exec/vax/ -v
                     USER        PID ACCESS COMMAND
/run/media/exec/vax: root     kernel mount /run/media/exec/vax
                     exec      269933 f...m gitstatusd-linu
❯ fuser -m /run/media/exec/vax/ -v
                     USER        PID ACCESS COMMAND
/run/media/exec/vax: root     kernel mount /run/media/exec/vax

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    private String transactionHash;
    private String blockHash;
    private Long blockNumber;
    private String fromAddress;
    private Long gas;
    private Long gasPrice;
    private String input;
    private Long nonce;
    private String toAddress;
    private Integer transactionIndex;
    private BigDecimal transactionValue;
    private Long blockTimestamp;
    private Receipt receipt;


private  String      transactionHash;
private  String      blockHash;
private  Long        blockNumber;
private  String      fromAddress;
private  Long        gas;
private  Long        gasPrice;
private  String      input;
private  Long        nonce;
private  String      toAddress;
private  Integer     transactionIndex;
private  BigDecimal  transactionValue;
private  Long        blockTimestamp;
private  Receipt     receipt;

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jobs # 列出 jobs 列表
bg %n # 让该 job 在后台工作
fg %n # 让该 job 在前台工作

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$ help disown
disown: disown [-h] [-ar] [jobspec ... | pid ...]
    Remove jobs from current shell.

    Removes each JOBSPEC argument from the table of active jobs.  Without
    any JOBSPECs, the shell uses its notion of the current job.

    Options:
      -a        remove all jobs if JOBSPEC is not supplied
      -h        mark each JOBSPEC so that SIGHUP is not sent to the job if the
                shell receives a SIGHUP
      -r        remove only running jobs

    Exit Status:
    Returns success unless an invalid option or JOBSPEC is given.

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awk '{ print $(NF) }'

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vmtouch -vt ~/.emacs.d/
vmtouch -vt ~/org/roam/
vmtouch -vt ~/org/daily/

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#include <sys/mman.h>
int mincore(void *addr, size_t length, unsigned char *vec);

#include <fcntl.h>
int posix_fadvise(int fd, off_t offset, off_t len, int advice);

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❯ sudo pacman -Ss scrcpy
archlinuxcn/scrcpy 1.19-1 [installed]
    Display and control your Android device

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❯ sudo pacman -Sii ddcutil
Repository      : extra
Name            : ddcutil
Description     : Query and change Linux monitor settings using DDC/CI and USB.

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modprobe i2c-dev

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  ~
❯ sudo ddcutil capabilities | grep "Feature: 10"
   Feature: 10 (Brightness)
  ~
❯ sudo ddcutil getvcp 10
VCP code 0x10 (Brightness                    ): current value =    50, max value =   100
  ~
❯ sudo ddcutil setvcp 100
Missing argument(s)
  ~
❯ sudo ddcutil setvcp 10100
  ~
❯ sudo ddcutil capabilities | grep "Feature: 10"
   Feature: 10 (Brightness)
  ~
❯ sudo ddcutil getvcp 10
VCP code 0x10 (Brightness                    ): current value =    50, max value =   100
  ~
❯ sudo ddcutil setvcp 10 100
  ~
❯ sudo ddcutil setvcp 10 20
  ~
❯ sudo ddcutil setvcp 10 100

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kdeconnect-cli -l
kdeconnect-cli -a --id-only
kdeconnect-cli -d ${deviceid} --ping
kdeconnect-cli -d ${deviceid} --share ${realpath_of_file}
kdeconnect-cli -d ${deviceid} --share-text ${text} # 这会把文本分享给手机的粘贴板。

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google-chrome-stable --headless --disable-gpu --virtual-time-budget=10000 --window-size=3840,2160 --screenshot https://www.google.com

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wkhtmltoimage --width 1980 --height 1024  --quality 100 --javascript-delay 10000 https://www.google.com google.png

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(defun exec/get-org-entry-summary ()
  (interactive)
  (setq urlraw (format
    "https://api.telegram.org/bot%s/sendMessage?chat_id=@%s&text="
    (read-file "/home/vory/.emacs.d/config/tgsync.token")
    (read-file "/home/vory/.emacs.d/config/chatid.priv")
    ))
  (setq urlraw (concat urlraw   (buffer-substring (line-beginning-position) (line-end-position))))

  (message urlraw)
  (setq urlq (url-encode-url urlraw))

  (setq url-proxy-services
  '(("http" . "127.0.0.1:1081")
 ("https" . "127.0.0.1:1081")))
  (url-retrieve-synchronously urlq)
  (message "sync to telegram channel success"))

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cat xxx.log | awk '{ print $1 }' | sort -n | uniq -c | sort -r -k1 | head 10

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EMOJIS=(😀 😃 😄 😁 😆 😅 🤣 😂 🙂 🙃 😉 😊 😇 🥰 😍 🤩 😘 ）
SELECTED_EMOJI=${EMOJIS[$RANDOM % ${#EMOJIS[@]}]};
echo -n $SELECTED_EMOJI

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set-option -g automatic-rename-format '#{b:pane_current_path}[#(/home/vory/Dotfiles/tmux/pick.sh)]'

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> sudo pacman -S tesseract tesseract-data-chi_sim tesseract-data-chi_tra tesseract-data-eng

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 tesseract FILE OUTPUTBASE [OPTIONS]... [CONFIGFILE]...
 # If FILE is stdin or - then the standard input is used.
 # If OUTPUTBASE is stdout or - then the standard output is used.

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xclip -sel clip -target image/png -o | tesseract stdin stdout -l chi_sim -c preserve_interword_spaces=1

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> sed -n '/apple/,/tigger/p'  file.txt
apple
forth line
...
tiger

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find . -name '*.go' -type f -exec sed -i 's/tg-service/tg-service\/bridge/g' {} ';'

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seq  # print a sequence of numbers

shuf #  generate random permutations

paste #   merge lines of files

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seq 100 | shuf | paste -s -d ,

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> cat gen.sh
N=100
if [[ $# -eq 1 ]];then
    N=$1
fi
for n in $(seq $N) ;
do
    if [[ $(($RANDOM % 3 )) -eq 0 ]];then
        echo $n
    fi
done


> printf "[%s]\n" "$(./gen.sh 365 | paste -s -d , )"

[3,10,11,18,21,22,32,37,40,44,45,46,48,50,52,53,55,57,61,63,64,65,66,68,69,76,79,90,91,93,95,96,99,100]

> printf "[%s]\n" "$(./gen.sh 365 | paste -s -d , )" | xclip -sel clip
# 生成随机结果， 并且复制到粘贴板

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import(
    gmysql "github.com/go-sql-driver/mysql"
)
type Transactions []Transaction

func (ts Transactions) Insert() error {
 if len(ts) == 0 {
  return nil
 }

 err := db.Clauses(clause.OnConflict{
  DoNothing: true,
 }).Create(&ts).Error
 if err == nil {
  return nil
 }

 var mysqlErr *gmysql.MySQLError
 if errors.As(err, &mysqlErr) && mysqlErr.Number == 1390 {
  mid := len(ts) / 2
  if err := ts[:mid].Insert(); err != nil {
   return err
  }
  if err := ts[mid:].Insert(); err != nil {
   return err
  }
  return nil
 }
 return err
}