rhcsa

man nm-settings
man nmcli-examples
nmcli con show "connexion_name" | grep ipv4.dad-timeout
nmcli con add type ethernet ifname ens32 ipv4.address 10.1.1.4/24 +ipv4.addresses 10.1.1.5/24 ipv4.gateway 10.1.1.1 ipv4.dns "1.1.1.1,2.2.2.2" ipv4.method {manual,dhcp} connection.autoconnect yes
nmcli con add type ethernet ifname ens32 ip4 10.1.1.4/24 gw4 10.1.1.1
nmcli connection add type ethernet ifname <interface-name> con-name <interface-name> ipv4.method manual ipv4.address <IP>/<prefix> ipv4.gateway <GW-address>
export SYSTEMD_EDITOR=/usr/bin/vi; sytemctl edit --full NetworkManager-wait-online.service
###########
systemd.debug-shell enforcing=0 rd.break [in tty9, don't need password]
systemd.unit=emergency.target,
restorecon /etc/shadow
setenforce 1

systemd.unit=rescue.target [ use of rd.break to interrupt the boot process before control is passed from initramfs to systemd]
systemctl status $$
###########
eval $(which tcpdump)
##########
systemctl edit --full rhel-autorelabel.service << changes .autorelabel file to other name causes reboot loop
###########
yum install setools-console policycoreutils-python
seinfo -t
seinfo -r
semanage user -l
semanage fcontext -l
fixfiles -F restore  (this is what is done when touching /.autorelabel and rebooting)
grubby --info /boot/vmlinuz-3.10.0-229.4.2.el7.x86_64
grubby --info=ALL
#############
echo "Hardening files..."
find / -type f -perm /00700 -a -uid 0 -exec chmod u-wrx {} \; 2>/dev/null
find / -type f -perm /00070 -a -gid 0 -exec chmod g-wrx {} \; 2>/dev/null
echo "Hardening directories..."
find / -type d -perm /00200 -a -uid 0 -exec chmod u-w {} \; 2>/dev/null
find / -type d -perm /00020 -a -gid 0 -exec chmod g-w {} \; 2>/dev/null
echo "Correcting a couple things..."
find /sbin -type f -perm /00000 -a -uid 0 -exec chmod u+x {} \; 2>/dev/null
find /usr/sbin -type f -perm /00000 -a -uid 0 -exec chmod u+x {} \; 2>/dev/null
###########
getcap `which ping`
find /usr/bin /usr/lib -perm /4000 -user root [find SUID]
find /usr/bin /usr/lib -perm /2000 -user root [find SGID]
setcap cap_net_bind_service=ep `which ncat` to be able to bind ports < 1024
###########
echo -e '.com\nAcom' | grep -F .co
echo -e 'a\n       a\n           a' | grep -E '^\s{1,11}a'

expandtab tabstop=1 shiftwidth=1
set et list tabstop=4
set et ts=2 sw=2 nu ic
imap jj <Esc>
:se all
:se
####################
pssh -i -H "172.20.0.33 172.20.0.35"  "tmsh save sys ucs \$HOSTNAME.20190819.ucs"
f5s="172.20.0.33 172.20.0.34 172.20.0.35"
for i in $f5s ; do ssh $i "echo \$HOSTNAME ; uptime" ; done
#############
echo 'export TESTPROFILE=1' >> /etc/profile
echo 'export TESTBASHRC=1' >> /etc/bashrc
env | grep TEST
ssh 127.0.0.1 "env | grep TEST"
###
X="Hi There"
bash
echo $X
export X="Hi There"
bash
echo $X
#############
Local Var vs Global Var
FOO=BAR
env | grep FOO
set | grep FOO
FOO=BAR
unset FOO
export FOO=BAR
env | grep FOO
set | grep FOO
printenv | grep FOO
printenv: Lists out all global ENVs set.
set: Lists out all the ENVs (global as well local)
###############
time
\time
###############
for ((i=1;i<10;i++));do echo $i;done
###############
echo 'dtdi ' >> bigip\ 4.conf
ls bigip*conf | xargs grep dtdi ; ls bigip*conf | xargs -t -0 grep dtdi
find ./ -iname bigip\*.conf -print0 | xargs -t -0 grep dtdi
find /tmp -name core -type f -print0 | xargs -t -0 /bin/rm -f
(find ./ -iname bigip\*.conf -print0  | xargs -n1 -0 -t grep dtdi)
VS
(find ./ -iname bigip\*.conf -print0  | xargs -0 -t grep dtdi)
###############
for i in *; do egrep   '^[a-zA-Z]+$' <<<"$i"; done






sudo subscription-manager remove --all
sudo subscription-manager unregister
sudo subscription-manager clean
sudo subscription-manager register
sudo subscription-manager refresh
sudo subscription-manager attach --auto
Execute sudo subscription-manager repos --list-enabled to see all actually enabled subscriptions.
Execute sudo subscription-manager repos --list to see all subscriptions that are available for you.
Execute sudo subscription-manager repos --enable <repo> if you want to add additional repos.