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HaruVON / Commands-Cheatsheet

List of commands that I often use

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Commands-Cheatsheet

List of commands that I often use

Get Full Path of Script

path=$(dirname "$(readlink -f "$0")")

SMB Mount

sudo mount -t cifs -o username=swiftd.adm //<server name>/<dir> <path to dir to mount>

Networking

Networking with RHEL

nmcli con add con-name "static-ens32" ifname ens32 type ethernet ip4 xxx.xxx.120.44/24 gw4 xxx.xxx.120.1
nmcli con mod "static-ens32" ipv4.dns "xxx.xxx.120.1,8.8.8.8"
nmcli con up "static-ens32" iface ens32
nmcli con show
nmcli con del ens32

IP Reset via DNS

if sudo grep -q /etc/dhcp/dhclient.conf -e 'inerface "ens160" {\n\tsend host-name = gethostname();\n\tsend dhcp-requested-address 192.168.10.101;\n}';
then
  sudo dhclient -r -v && sudo dhclient -4 -d -v -cf /etc/dhcp/dhclient.conf ens16- && sudo reboot;
else
  sudo echo 'inerface "ens160" {\n\tsend host-name = gethostname();\n\tsend dhcp-requested-address 192.168.10.101;\n}' >> /etc/dhcp/dhclient.conf;
  sudo dhclient -r -v && sudo dhclient -4 -d -v -cf /etc/dhcp/dhclient.conf ens16- && sudo reboot;
fi

or

if ! sudo grep -q /etc/dhcp/dhclient.conf -e 'inerface "ens160" {\n\tsend host-name = gethostname();\n\tsend dhcp-requested-address 192.168.10.101;\n}';
then
  sudo echo 'inerface "ens160" {\n\tsend host-name = gethostname();\n\tsend dhcp-requested-address 192.168.10.101;\n}' >> /etc/dhcp/dhclient.conf;
fi

sudo dhclient -r -v && sudo dhclient -4 -d -v -cf /etc/dhcp/dhclient.conf ens16- && sudo reboot;

Systemd Services

systemctl commands:

  • enable: enables on boot
  • status: gets status
  • restart
  • start
  • reload
journalctl -u service-name.service
journalctl -u service-name.service -b
journalctl -u service-name

Just use the journalctl command, as in:

journalctl -u service-name.service

Or, to see only log messages for the current boot:

journalctl -u service-name.service -b

For things named .service, you can actually just use , as in:

journalctl -u service-name
journalctl -u swag -n 100 --no-pager

Just CLI Stuffs

Run a command in the background and disown

ctrl-z
bg
disown
grep -rnw <dir> -e 'pattern'
find [where to start searching from] [expression determines what to find] [-options] [what to find]
find <dir to search from> -name:option for file name 'pattern'
find ./ -name 'example.txt'

Change ownership of files

sudo chown -R user:group <dir>

-R - recursive

Documentation

Ansible

Vars

OSCAP

Link

Python

import re
with open("U_CAN_Ubuntu_20-04_LTS_STIG_V1R1_Manual-xccdf.xml") as fin, open('output', 'w') as fout:
  for line in fin:
    matches = re.findall('idref=\"V-\d\d\d\d\d\d', line)
    fout.writelines(match + '\n' for match in matches)

SSH

Generate SSH key

ssh-keygen -b 4096

View SSH Key Size

ssh-keygen -lf <path_to_public_key_file>

About

List of commands that I often use