John Safrit jsafrit

jsafrit / mount

Created August 22, 2017 16:55

	MOUNTING A HARD DISK IMAGE INCLUDING PARTITIONS USING LINUX
	JANUARY 22, 2008 ANDRE 63 COMMENTS
	A while ago I thought it would be a good idea to make a backup of my Linux server by just dumping the complete disk to a file. In retrospect, it would have been much easier had I just dumped the individual filesystems.
	When I finally got around to using this backup, long after the 10GB disk had perished I realized that to use the loopback device to mount a filesystem it actually needs a filesystem to mount. What I had was a disk image, including partition table and individual partitions. To further complicate matters the data partition was also not the first partition inside this image.
	For reference, I created this image using the Unix ‘dd’ tool:
	# dd if=/dev/hda of=hda.img
	30544113+0 records in
	30544113+0 records out
	# ls -lh
	-rw-r--r-- 1 root root 9.6G 2008-01-22 14:12 hda.img

jsafrit / checkInternet

Last active July 4, 2017 21:16

bash check for internet connectivity

	checkInternet()
	{
	echo -e "GET http://google.com HTTP/1.0\n\n" \| nc google.com 80 > /dev/null 2>&1 # query google with a get request
	if [ $? -eq 0 ]; then #check if the output is 0, if so no errors have occured and we have connected to google successfully
	return 0
	else
	echo "Error: no active internet connection" >&2 #sent to stderr
	return 1
	fi
	}

jsafrit / TestJohn.ipynb

Created November 6, 2015 14:20

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jsafrit / Tutorial1.ipynb

Created October 10, 2015 19:21

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jsafrit / screenlst.sh

Created July 27, 2015 20:07

interactive screen selection

	#!/bin/bash

	# filters the screen -ls output to show the sesssions
	sessions=`screen -ls \| sed -ne 's/[[:space:]]//' -ne 's/$(Attached)\\|(Detached)\\|(Multi, detached)\\|(Multi, attached)$// p'`
	#echo $sessions
	#echo $sessions \| wc -w
	res=`echo "$sessions" \| wc -w`

	if [[ "$res" != "0" ]]
	then

jsafrit / gitconfig

Created January 16, 2015 04:06

My git setup

	[user]
	name = John Safrit
	email = jsafrit@users.noreply.github.com
	[alias]
	co = checkout
	ci = commit
	st = status
	br = branch
	hist = log --pretty=format:\"%h %ad \| %s%d [%an]\" --graph --date=short
	type = cat-file -t

jsafrit / bash_aliases

Last active August 29, 2015 14:12

Custom bash alias file