czerasz · July 25, 2016 01:58
diff --git a/autossh.c b/autossh.c
 // Compile with
 // gcc -o /etc/bin/autossh autossh.c
 #include <stdio.h>
 int main(int argc, char *argv[]) {
  while(1) {
    sleep(60);
    printf(".\n");
  }
 }
diff --git a/commands.sh b/commands.sh
 # Latest git commit hash
 git log --pretty=format:'%h' -n1

 # Search for a gem on rubygem servers
 gem search -r eventmachine

 # List files and directories and sort on their sizes
 du -hs * | sort -h

 # Show how much space the current directory uses
 du -hs

 # Show overall disc usage stats
 df -h

 # Grep with extended regular expression
 # http://www.cyberciti.biz/faq/grep-regular-expressions/
 grep -E "slot=(8,9,10)"

 # Return only the matched content instead of the whole line - helpful for minified javascript
 grep -ioR '\./assets.*swf?' ./
 # -l - return only the filename
 # -c - see how much it apeared in each searched file

 # Grep certain file extensions
 grep -nir --include "*.js" --include "*.html" "searched term" ./

 # Copy directory and replace links with real files
 cp -Lr some-dir some-new-dir

 # rsync - better then copy
 # Copy to the 10.0.50.50 server with specified credentials
 rsync -av -e "ssh -i /home/user/.ssh/servers-keys" /directory/which/should/be/copied 10.0.50.50:/directory/where/to/copy

 # Other Example. Resource: http://articles.slicehost.com/2007/10/9/backing-up-your-files-with-rsync
 rsync -e 'ssh -p 30000' -avl --delete --stats --progress [email protected]:/home/demo /backup/

 # Repeat command (ls -al) every 5 seconds
 watch -n 5 'ls -al'

 # curl send on OPTIONS request
 curl -I -v -H 'Host: www.example.com' -X OPTIONS http://www.example.com

 # View the command of the process matched with the id: PROCESS_ID
 ls -l /proc/{PROCESS_ID}/exe 

 # Display all files except png's, gif's and jpg's
 # -f will show full paths
 tree -f -I '*gif|*jpg|*png'

 # Kill a process
 kill `ps -eo pid,args | awk '$3 == "myservice.java" { print $1 }'`

 # See which process is using the current directory
 fuser -v ./

 # List process details
 ps -eo user,pid,%cpu,%mem,stat,start,time,cmd

 # list process relations
 ps auxw --forest

 # Sort by second column where the separator is a ","
 sort -t "," -k 2 input-file.data

 # Create a basic auth (htpasswd) file
 htpasswd -cdb file-name 'user-name' 'your-password' # File name is usually "htpasswd"
 # !!important!! -c will override the file if it exists. If You already have a file remove the -c option

 # monitor the system calls used by a program
 strace git ls-remote git@localhost:repo.git

 # -p flag to attach to a running process
 strace -p 1725 -o output.txt; tail -f output.txt

 # xargs example
 find . -name *.scss | xargs -I style_file echo "->" style_file

 # Strace save output to file
 strace -p 2707 -o /tmp/debug.log -f

 # View process memory details - memory map of a process
 pmap -x <PID>
diff --git a/git-subtree-workflow.md b/git-subtree-workflow.md
diff --git a/jq-examples.md b/jq-examples.md
diff --git a/log-commands.md b/log-commands.md
diff --git a/memory-usage-monitor.md b/memory-usage-monitor.md
diff --git a/networking.md b/networking.md
diff --git a/notes.md b/notes.md
diff --git a/python.md b/python.md
diff --git a/screen-notes.md b/screen-notes.md
diff --git a/start-script-helper.sh b/start-script-helper.sh
 #!/bin/bash

 script_directory="$( cd "$( dirname "$0" )" && pwd )"
 project_directory=$script_directory/..
diff --git a/swap.md b/swap.md
diff --git a/text-manipulation.md b/text-manipulation.md
diff --git a/tip-and-tricks.md b/tip-and-tricks.md
	// Compile with
	// gcc -o /etc/bin/autossh autossh.c
	#include <stdio.h>
	int main(int argc, char *argv[]) {
	while(1) {
	sleep(60);
	printf(".\n");
	}
	}
	# Latest git commit hash
	git log --pretty=format:'%h' -n1

	# Search for a gem on rubygem servers
	gem search -r eventmachine

	# List files and directories and sort on their sizes
	du -hs * \| sort -h

	# Show how much space the current directory uses
	du -hs

	# Show overall disc usage stats
	df -h

	# Grep with extended regular expression
	# http://www.cyberciti.biz/faq/grep-regular-expressions/
	grep -E "slot=(8,9,10)"

	# Return only the matched content instead of the whole line - helpful for minified javascript
	grep -ioR '\./assets.*swf?' ./
	# -l - return only the filename
	# -c - see how much it apeared in each searched file

	# Grep certain file extensions
	grep -nir --include ".js" --include ".html" "searched term" ./

	# Copy directory and replace links with real files
	cp -Lr some-dir some-new-dir

	# rsync - better then copy
	# Copy to the 10.0.50.50 server with specified credentials
	rsync -av -e "ssh -i /home/user/.ssh/servers-keys" /directory/which/should/be/copied 10.0.50.50:/directory/where/to/copy

	# Other Example. Resource: http://articles.slicehost.com/2007/10/9/backing-up-your-files-with-rsync
	rsync -e 'ssh -p 30000' -avl --delete --stats --progress [email protected]:/home/demo /backup/

	# Repeat command (ls -al) every 5 seconds
	watch -n 5 'ls -al'

	# curl send on OPTIONS request
	curl -I -v -H 'Host: www.example.com' -X OPTIONS http://www.example.com

	# View the command of the process matched with the id: PROCESS_ID
	ls -l /proc/{PROCESS_ID}/exe

	# Display all files except png's, gif's and jpg's
	# -f will show full paths
	tree -f -I 'gif\|jpg\|*png'

	# Kill a process
	kill `ps -eo pid,args \| awk '$3 == "myservice.java" { print $1 }'`

	# See which process is using the current directory
	fuser -v ./

	# List process details
	ps -eo user,pid,%cpu,%mem,stat,start,time,cmd

	# list process relations
	ps auxw --forest

	# Sort by second column where the separator is a ","
	sort -t "," -k 2 input-file.data

	# Create a basic auth (htpasswd) file
	htpasswd -cdb file-name 'user-name' 'your-password' # File name is usually "htpasswd"
	# !!important!! -c will override the file if it exists. If You already have a file remove the -c option

	# monitor the system calls used by a program
	strace git ls-remote git@localhost:repo.git

	# -p flag to attach to a running process
	strace -p 1725 -o output.txt; tail -f output.txt

	# xargs example
	find . -name *.scss \| xargs -I style_file echo "->" style_file

	# Strace save output to file
	strace -p 2707 -o /tmp/debug.log -f

	# View process memory details - memory map of a process
	pmap -x <PID>
Mode	Description
r	Read
w	Write
a	Append
b	Binary mode
t	Text mode (default)
+	Shortcut for `r+w`
	#!/bin/bash

	script_directory="$( cd "$( dirname "$0" )" && pwd )"
	project_directory=$script_directory/..
Option	Parameter	Description
Concurrency	`-c`	10 parallel users
Time for Test	`-t`	60 seconds
Timeout	`-s`	15 seconds (30 seconds it kind of too high) - this value is the timeout per request
Number of Requests	`-n`	100 million (All will not be processed in the 60s - therefore this is a good upper limit, to ensure that the test is run for 60s)
Header	`-H`	HTTP request header