@haeramkeem haeramkeem

Jumpin deer @ Mt. Gwanak

haeramkeem / bash-tcpdump-tshark.sh

Created July 11, 2022 08:24

	#!/bin/bash

	# This captures VRRP packet by tshark
	tshark -nni enp0s3 -f 'vrrp'

	# This also captures VRRP packet by tcpdump
	# <interface> <how many packets> <verbose - v or vv> <filter>
	# -i $NIC -c ${NUM} -v ${...EXPRESSIONS}
	tcpdump -i enp0s3 -c 100 -v vrrp

haeramkeem / ubuntu-manage-users.sh

Last active July 9, 2022 15:32

	#!/bin/bash

	# Ref: https://mirwebma.tistory.com/112

	# See all users
	grep ${USERNAME} /etc/passwd

	# Add user
	adduser ${USERNAME}

haeramkeem / bash-multiline-variable.sh

Created July 7, 2022 01:06

Bash) multiline string variable

	#!/bin/bash

	# Ref: https://stackoverflow.com/a/15429426
	read -d '' sql << EOF
	select c1, c2 from foo
	where c1='something'
	EOF

	echo "$sql"

haeramkeem / bash-variable-substitution-lower-upper-case-string.sh

Created July 7, 2022 00:19

	#!/bin/bash

	SAMPLE="SaMpLe"

	echo ${SAMPLE^^} # This makes the string to be uppercase -> STDOUT("SAMPLE")
	echo ${SAMPLE,,} # This makes the string to be lowercase -> STDOUT("sample")

haeramkeem / git-checkout-remote-branch.sh

Created July 7, 2022 00:13

Git) Checkout to remote branch

	#!/bin/bash

	git pull # This refeshes the local branches to fetch remote branches
	git checkout origin/${BRANCH_NAME} # I donno if this necessary
	git switch -c ${BRANCH_NAME}

haeramkeem / git_delete_branch.sh

Created June 29, 2022 11:08

git) Delete branch

	#!/bin/bash

	# Ref: https://stackoverflow.com/q/2003505
	# Ref: https://stackoverflow.com/a/2003515

	# Delete local-cached remote branch
	git branch -rd origin/${BRANCH}

	# Delete local branch
	git branch -D ${BRANCH}

haeramkeem / get_primary_ip.sh

Created June 29, 2022 06:46

Get primary IPADDR

	#!/bin/bash

	ip -4 addr show enp0s3 \| grep -oP '(?<=inet\s)\d+(\.\d+){3}'

haeramkeem / bash_inline_ifelse.sh

Created June 29, 2022 06:26

	#!/bin/bash

	# Ref: https://linuxize.com/post/how-to-compare-strings-in-bash/

	# Basic
	[[ "string1" == "string2" ]] && echo "Equal" \|\| echo "Not equal"

	# Variable alloc
	TEMP=$([[ "string1" == "string2" ]] && echo "Equal" \|\| echo "Not equal")

haeramkeem / rhel_user_list.sh

Created June 29, 2022 05:03

RHEL get user list

haeramkeem / systemd_cgroup_check.sh

Created June 28, 2022 00:26

Check service running on systemd cgroup