photonxp’s gists

photonxp / exrc

Last active August 9, 2020 13:55

~/.exrc file for vi

photonxp / backup.sh

Last active November 21, 2017 12:02

backup and restore linux os with tar

	#!/bin/sh

	echo "Make sure update_note.txt is ready."
	echo
	./wait_confirm.sh

	datef=`date '+%Y%m%d.%H%M'`
	echo "date is: " $datef

	backup_home=/mnt/whale/ubuntu16.04.2.of.1_archive/$datef

photonxp / check_tar_gz.sh

Last active November 18, 2017 04:45

check and list the top folders of a give tar file

	#!/bin/sh

	# check and list the top folders of a give tar file
	# Or simply use archivemount
	# https://linuxaria.com/howto/how-to-mounts-an-archive-for-access-as-a-file-system

	# tar_archive_path as /path/to/archive.tar.gz
	tar_archive_path=$1

	mkdir -p /tmp/tartest

photonxp / tar_example.txt

Last active November 17, 2017 04:19

explain some part of tar command

	compress:
	tar -zcvf tar-archive-name.tar.gz source/folder/name

	decompress:
	tar -zxvf tar-archive-name.tar.gz
	tar -zxvf tar-archive-name.tar.gz -C /tmp
	mkdir -p /tmp/tartest && rm -r /tmp/tartest/* && tar -zxvf tar-archive-name.tar.gz -C /tmp/tartest && ls -a /tmp/tartest

	Both tar -c and tar -x don't affect the user permissions of the folders in the tar.gz file
	============

photonxp / list_shared_library_path.sh

Created November 14, 2017 12:47

list paths of shared library in linux

	#!/bin/sh

	# list part of the paths of shared library in linux

	ldconfig -p \| grep "/usr/lib"
	ldconfig -p \| grep "/usr/local"


	sudo printenv LD_LIBRARY_PATH

photonxp / restore_guid_partition_table.sh

Last active November 13, 2017 12:09

Risky way to backup and restore guid partition tables

	#!/bin/sh

	# The number of partition tables could be varied and uncertain.
	# So is the length of backup file.

	# Only works in limited situations
	# Won't work if any new partition is added to the partition table later
	# Require sudo privilege
	# Use the code only after you know what you're doing. Use at your own risk.
	# Change the variables in the script if necessary

photonxp / backup_guid_partition_table.sh

Last active November 16, 2017 13:59

Risky way to backup and restore guid partition tables (GPT)

	#!/bin/sh

	# The number of partitions in the partition table could be varied and uncertain.
	# So is the length of backup file.

	# Only works in limited situations
	# Won't work if any new partition table is added to the partition table later
	# Require sudo privilege
	# Use the code only after you know what you're doing. Use at your own risk.
	# Change the variables in the script if necessary

photonxp / rcgroup_add_files.sh

Last active November 15, 2017 10:50

add files to rcN.d folders for an init file

	#!/bin/sh

	# add files to rcN.d folders for a given name of existed init file
	# ./rcgroup_add_files.sh init_file_name

	ln -s /etc/init.d/"$1" /etc/rc0.d/K20"$1"
	ln -s /etc/init.d/"$1" /etc/rc1.d/K20"$1"
	ln -s /etc/init.d/"$1" /etc/rc2.d/S20"$1"
	ln -s /etc/init.d/"$1" /etc/rc3.d/S20"$1"
	ln -s /etc/init.d/"$1" /etc/rc4.d/S20"$1"

photonxp / initfile.sh

Created May 27, 2017 03:26

common init file for apps that support starting/stopping with pid file by command internally

	#!/bin/sh
	### BEGIN INIT INFO
	# Provides: $app_name
	# Required-Start: $network $local_fs $remote_fs
	# Required-Stop: $remote_fs
	# Default-Start: 2 3 4 5
	# Default-Stop: 0 1 6
	# Short-Description: lightweight
	# Description: app is a lightweight
	# for embedded devices and low end boxes.

photonxp / add_links_in_folders.sh

Last active May 27, 2017 01:27

create multiple links to the rc folders, using for loops

	#!/bin/sh

	# word expansion {..,..} works in bash but not sh shell, use for loop instead.
	#ln -s /etc/init.d/initfile-local /etc/rc{0,1}.d/K20initfile-local

	target=/etc/init.d/initfile-local
	#The sh shell doesn't support word expanson well.
	dirs="rc0.d rc1.d rc2.d rc3.d rc4.d rc5.d rc6.d"
	for dir in $dirs
	do echo $dir

testname photonxp