jaybutzler

#!/bin/bash
#
# Use openssl to fetch the certificate chain for a domain and add these 
# certificates to the Ubuntu CA trust store.  This is a fast and dirty
# method when using cloud services like ZScaler with SSL scanning, where 
# the Cloud Enforcement Node certifcate changes frequently.

if [[ -z "$1" ]] ; then
  echo Syntax error, please provide the fully qualified domain name
  echo address: "update_chain google.com"

jaybutzler

Linux Permission (Basics)

Linux permissions are a set of flags associated with each file determines who can access that file, and how they can access it. These flags are called file permissions or modes, as in "mode of access." The command name chmod stands for "change mode." It restricts the way a file can be accessed.

user	group	others
r w x	r w x	r w x
4 2 1	4 2 0	4 0 1

4+2+1 = 7 (rwx) # user

jaybutzler

Searching on Github

Searching on GitHub - Issues & PR's

Search Snippits

commenter:jaybutzler type:issue

jaybutzler

Nano Cheat Sheet

File handling

Command	Description
Ctrl+S	Save current file
Ctrl+O	Offer to write file ("Save as")
Ctrl+R	Insert a file into current one
Ctrl+X	Close buffer, exit from nano

jaybutzler

Linux screen Configuration

Plade the following content in the users home directory and file "~/.screenrc".

shell -$SHELL
defscrollback 1024 

shelltitle "$ |bash"

jaybutzler

AWK Cheat Sheet

Basics 1

Command	Description
$1	Reference first column
awk '/pattern/ {action}' file	Execute action for matched pattern 'pattern' on file 'file'
;	Char to seperate two actions
print	Print current record line
$0	Reference current record line

jaybutzler

Screen Quick Reference

Basic

Description	Command
Start a new session with session name	screen -S <session_name>
List running sessions / screens	screen -ls
Attach to a running session	screen -x
Attach to a running session with name	screen -r