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Serghei Iakovlev sergeyklay

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View weechat-cheatsheet.md

My Personal WeeChat Cheat Sheet

Requirements

You need at least WeeChat 3.2-dev

Install

Ubuntu/Debian

@sergeyklay
sergeyklay / pyenv-install.md
Last active Jul 4, 2021
Multiple Python versions using pyenv and python-build
View pyenv-install.md

Multiple Python versions using pyenv and python-build

Installation

Install pyenv

git clone git@github.com:pyenv/pyenv.git ~/.pyenv
cd ~/.pyenv && src/configure && make -C src
@sergeyklay
sergeyklay / no-omit-frame-pointer.md
Last active Jul 6, 2021
GCC/Clang -fno-omit-frame-pointer and -fsanitize=address
View no-omit-frame-pointer.md

Description

Frame pointer omission does make debugging significantly harder. Local variables are harder to locate and stack traces are much harder to reconstruct without a frame pointer to help out. Also, accessing parameters can get more expensive since they are far away from the top of the stack and may require more expensive addressing modes.

The -fno-omit-frame-pointer option direct the compiler to generate code that maintains and uses stack frame pointer for all functions so that a debugger can still produce a stack backtrace even with optimizations flags.

Irrespective if you use the flag, not every function needs a frame pointer in the first place, so you can't always expect a difference with the flag.

Also, whether the function has a frame pointer is an implementation detail. Compilers can differ in implementation details (and usually they do).

@sergeyklay
sergeyklay / rpn.kt
Last active May 30, 2020
Reverse Polish Notation
View rpn.kt
import java.util.Stack
import java.lang.Long.parseLong
fun String.isNumeric(): Boolean {
return try {
parseLong(this)
true
} catch (e: NumberFormatException) {
false
}
View bash.generate.random.alphanumeric.string.sh
#!/bin/bash
# bash generate random alphanumeric string
#
# bash generate random 32 character alphanumeric string (upper and lowercase) and
NEW_UUID=$(cat /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w 32 | head -n 1)
# bash generate random 32 character alphanumeric string (lowercase only)
cat /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w 32 | head -n 1
@sergeyklay
sergeyklay / template.service
Created Jul 14, 2019 — forked from chrj/template.service
Sample service unit file for systemd
View template.service
[Unit]
Description=My service
[Service]
ExecStart=/usr/local/bin/my-service \
-argument value \
-otherargument othervalue
# Setuid/Setgid
User=nobody
@sergeyklay
sergeyklay / journalctl-cheatsheet.md
Last active Sep 8, 2021
Journalctl Cheat Sheet
View journalctl-cheatsheet.md

Journalctl Cheat Sheet

Configuration

Permissions

To see messages from other users and the system as well as performing various log operations from a regular user add it to the group:

sudo usermod -aG systemd-journal $USER
@sergeyklay
sergeyklay / version-compare.clj
Created Jun 22, 2019
Simple version compare using clojure
View version-compare.clj
(defn- normalize-verison
[version]
(let [[x y z] (map read-string (clojure.string/split version #"\."))
z (or z 0)]
(+ (* x 10000) (* y 100) z)))
(defn version-compare
[a b]
(let [left (normalize-verison a)
right (normalize-verison b)]
@sergeyklay
sergeyklay / telnet-imap
Last active May 30, 2019
Playing with Gmail via Telnet
View telnet-imap
$ telnet-ssl -z ssl imap.gmail.com 993
Trying 173.194.222.109...
Connected to gmail-imap.l.google.com.
Escape character is '^]'.
* OK Gimap ready for requests from 193.201.216.169 z8mb75199760ljk
a1 LOGIN xxxxxxxx@gmail.com my-password-here
* CAPABILITY IMAP4rev1 UNSELECT IDLE NAMESPACE QUOTA ID XLIST CHILDREN X-GM-EXT-1 UIDPLUS COMPRESS=DEFLATE ENABLE MOVE CONDSTORE ESEARCH UTF8=ACCEPT LIST-EXTENDED LIST-STATUS LITERAL- SPECIAL-USE APPENDLIMIT=35651584
a1 OK xxxxxxxx@gmail.com authenticated (Success)
a2 LIST "" "*"
* LIST (\HasNoChildren) "/" "INBOX"
View http-client-example.go
package main
import (
"fmt"
"golang.org/x/net/context"
cc "golang.org/x/oauth2/clientcredentials"
"io/ioutil"
"net/http"
"os"
)