sudo systemctl stop firewalld
sudo systemctl stop ipchains
sudo systemctl stop iptables
sudo systemctl restart jira
sudo systemctl restart atlbitbucket
# clear all
history -c
history -w
# delete line
history -d 2013
history -w
for i in {1..50};do \
history -d 2013;done;\
history -w
count=`wc -l ~/.bash_history|awk '{print $1+1}'`;start_line=$(($count-10));\
for ((line=$count;line>=$start_line;--line));do history -d $line;done;\
history -w
command -v __git_ps1 >/dev/null 2>&1 || { echo >&2 "__git_ps1 not installed";}
hash __git_ps1 >/dev/null 2>&1 || { echo >&2 "__git_ps1 not installed";}
type __git_ps1 >/dev/null 2>&1 || { echo >&2 "__git_ps1 not installed";}
# check by using if else conditional block
if hash __git_ps1 2>/dev/null;then echo '__git_ps1';\
else echo 'no __git_ps1';fi
Bash Arrays
declare -ax HADOOP_SCHEDULERS=(dev prod);\
declare -Ax MINMAX_CAPACITIES=([dev]='50 50' [prod]='50 70');\
for HADOOP_SCHEDULER in ${HADOOP_SCHEDULERS[@]};do \
IFS=' ' read -r -a MINMAX_CAPACITY <<< "${MINMAX_CAPACITIES[${HADOOP_SCHEDULER}]}";\
MIN_CAPACITY=${MINMAX_CAPACITY[0]};\
MAX_CAPACITY=${MINMAX_CAPACITY[1]};\
echo "${HADOOP_SCHEDULER} » Min » ${MIN_CAPACITY} » Max » ${MAX_CAPACITY}";\
done
Knowledge
sudo apt install neofetch
neofetch --cpu-brand off
neofetch
# add the new key(s) to known_hosts
ssh-keyscan -H git.academia.chorke.org >> ~/.ssh/known_hosts
# remove the old key(s) from known_hosts
ssh-keygen -R git.academia.chorke.org
cat /etc/os-release
References