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Cheat Sheet

echo $? - exit status of last command (0 no error)
' - Single quote removes meaning special meaning of special character.
find /qwe -type f -iname *.js -exec cp --parents -t /tmp/ {} + -- find all js files and copy with parent directory
ystemctl set-default (ls -l /lib/systemd/system/runlevel*) -- set runlevel
echo <password> | sudo -S

for i in t@01 st@02 ba@sta03;do ssh -o RequestTTY=true $i "sudo -l";done -- allow tty present

:r! sed -n '16,812 p' < input_file.txt -- copy line range from input_file
:1,10d -- delete line from 1 to 10
:se nu -- show line numbers

Redirection in Apache (By default, the Redirect directive establishes a 302, or temporary, redirect.):
<VirtualHost *:80>
Redirect 301 /oldlocation

ServerTokens Prod -- hides Apache version

vi /etc/logrotate.d/

iptables -A INPUT -p tcp -m tcp --dport 5000 -j DROP -- discard incoming traffic
iptables -A INPUT -p tcp -m tcp --dport 8094 -j ACCEPT -- allow incoming traffic
iptables -D INPUT -p tcp -m tcp --dport 5000 -j DROP -- Delete rule
iptables -I INPUT -p tcp ! -s yourIPaddress --dport 22 -j DROP -- discard incoming traffic for posrt 22 except yourIPaddress
iptables-save >/etc/sysconfig/iptables -- save rules

git init -- creates .git folder
Files are untracked when first created
git add -- to start tracking (stage all files and changes in the current folder)
git diff --staged show changes on added files


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