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@amitsaha
amitsaha / ls.rst
Last active January 24, 2026 02:00
How does `ls` work?

How does ls work?

I wanted to be really able to explain to a fair amount of detail how does the program :command:`ls` actually work right from the moment you type the command name and hit ENTER. What goes on in user space and and in kernel space? This is my attempt and what I have learned so far on Linux (Fedora 19, 3.x kernel).

How does the shell find the location of 'ls' ?

@surjikal
surjikal / encrypt-pw-ssha.sh
Last active May 26, 2023 18:45
Encrypt a password using SSHA. Use this for your `htpasswd` files.
#!/bin/sh
# http://wiki.nginx.org/Faq#How_do_I_generate_an_htpasswd_file_without_having_Apache_tools_installed.3F
PASSWORD=$1;
SALT="$(openssl rand -base64 3)"
SHA1=$(printf "$PASSWORD$SALT" | openssl dgst -binary -sha1 | sed 's#$#'"$SALT"'#' | base64);
printf "{SSHA}$SHA1\n"
@jshaw
jshaw / byobuCommands
Last active April 21, 2026 04:59
Byobu Commands
Byobu Commands
==============
byobu Screen manager
Level 0 Commands (Quick Start)
------------------------------
<F2> Create a new window
@jonpugh
jonpugh / git-pull-recursive.rb
Last active October 20, 2021 03:20
Lots of repos? Try "git-pull-recursive" to run "git pull" on all subfolders with a .git folder inside. Thanks to http://snipplr.com/view/62314/perform-git-pull-on-subdirectory-recursive/
# For use in Chef:
# Adds a command: git-pull-recursive
file "/usr/local/bin/git-pull-recursive" do
owner "root"
group "root"
mode "0755"
action :create
content 'find . -type d -name .git -exec sh -c "cd \"{}\"/../ && pwd && git pull" \;'
end
@pklaus
pklaus / dnsupdate.py
Last active November 14, 2023 23:50
dnsupdate is meant to replace nsupdate, the standard DDNS update tool created by BIND authors ISC. While nsupdate does the job it is awkward to wrap in scripts and its usage in general is just not very intuitive. dnsupdate is meant to work well from the command line or from scripts and easy to use. It also does some nice things like automaticall…
#!/usr/bin/env python2.7
# Matt's DNS management tool
# Manage DNS using DDNS features
#
# See http://planetfoo.org/blog/archive/2012/01/24/a-better-nsupdate/
#
# Usage: dnsupdate -s server -k key -t ttl add _minecraft._tcp.mc.example.com SRV 0 0 25566 mc.example.com.
# -h HELP!
# -s the server
# -k the key
@whitingx
whitingx / meta-tags.md
Created October 5, 2012 16:41 — forked from kevinSuttle/meta-tags.md
Complete List of HTML Meta Tags

Copied from http://code.lancepollard.com/complete-list-of-html-meta-tags/

Basic HTML Meta Tags

<meta charset='UTF-8'>
<meta name='keywords' content='your, tags'>
<meta name='description' content='150 words'>
<meta name='subject' content='your website's subject'>
<meta name='copyright' content='company name'>
@actionjack
actionjack / gist:2973543
Created June 22, 2012 15:38
updating foreman host's environment with the rest api
command line used: (need to change username and password)
curl -k -u [USERNAME]:[PASSWORD] -X PUT -H "Content-Type:application/json" -H "Accept:application/json" -d '{"host":{"subnet_id":null,"serial":null,"puppetproxy_id":null,"name":"cittavld10.globoi.com","managed":null,"last_report":null,"comment":"","architecture_id":1,"created_at":"2011-10-10T17:46:30Z","sp_mac":"","puppetmaster_name":"puppet-lab.dev.globoi.com","image_file":null,"updated_at":"2012-02-29T14:41:29Z","sp_name":"","mac":"00:16:3e:16:69:b8","installed_at":null,"domain_id":2,"use_image":null,"root_pass":"xybxa6JUkz63w","owner_id":2,"medium_id":null,"id":896,"hostgroup_id":null,"enabled":true,"build":false,"ptable_id":null,"sp_subnet_id":null,"puppet_status":0,"last_freshcheck":null,"ip":"127.0.01","environment_id":2,"source_file_id":null,"model_id":1,"environment":{"environment":{"name":"lab2","id":2}},"sp_ip":"","disk":null,"owner_type":"User","operatingsystem_id":5,"last_compile":"2011-08-21T04:02:27Z"}}' http://localhost:3000/hosts/citta
@jexchan
jexchan / multiple_ssh_setting.md
Created April 10, 2012 15:00
Multiple SSH keys for different github accounts

Multiple SSH Keys settings for different github account

create different public key

create different ssh key according the article Mac Set-Up Git

$ ssh-keygen -t rsa -C "your_email@youremail.com"
@dupuy
dupuy / README.rst
Last active April 1, 2026 08:32
Common markup for Markdown and reStructuredText

Markdown and reStructuredText

GitHub supports several lightweight markup languages for documentation; the most popular ones (generally, not just at GitHub) are Markdown and reStructuredText. Markdown is sometimes considered easier to use, and is often preferred when the purpose is simply to generate HTML. On the other hand, reStructuredText is more extensible and powerful, with native support (not just embedded HTML) for tables, as well as things like automatic generation of tables of contents.

@splaspood
splaspood / bash_iniparse.sh
Created December 13, 2011 20:34
Parsing INI Files with Bash
cfg.parser () {
fixed_file=$(cat $1 | sed 's/ = /=/g') # fix ' = ' to be '='
IFS=$'\n' && ini=( $fixed_file ) # convert to line-array
ini=( ${ini[*]//;*/} ) # remove comments
ini=( ${ini[*]/#[/\}$'\n'cfg.section.} ) # set section prefix
ini=( ${ini[*]/%]/ \(} ) # convert text2function (1)
ini=( ${ini[*]/=/=\( } ) # convert item to array
ini=( ${ini[*]/%/ \)} ) # close array parenthesis
ini=( ${ini[*]/%\( \)/\(\) \{} ) # convert text2function (2)
ini=( ${ini[*]/%\} \)/\}} ) # remove extra parenthesis