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[*]
end_of_line = lf
indent_style = tab
tab_width = 4

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**/*_
**/.#*
**/0*
**/1*
**/2*
**/3*
**/4*
**/5*
**/6*
**/7*
**/8*
**/9*
**/*.log*
**/*log
**/LOG*
cache/**
data/**
old/**
outer/**
secret/**

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| A | B |
|-----------------------------------------|-----------------------------------------|
| | [Linux](docs/linux/common.md) |
| | [MariaDB](docs/progs/mariadb.md) |
| | [MC](docs/progs/mc.md) |
| | [Socat](docs/progs/socat.md) |
| [Math](docs/math.md) | [Crontab](docs/progs/crontab.md) |
| | [Kubernetes](docs/progs/kubernetes.md) |
| | [NMCli](docs/progs/nmcli.md) |
| [Math](docs/math.md) | [SSH](docs/progs/ssh.md) |
| | [GIT](docs/progs/git.md) |
| | [PHP](docs/progs/php.md) |

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[File systems](filesystems.md)
[Fedora / CentOS](fedora.md)
[SELinux](selinux.md)
# Common
## find
```
find /var -maxdepth 2 -type d -printf "%TY-%Tm-%Td %TH:%TM:%TS %Tz %p\n"
```
## bash
```
# cat > /etc/profile.d/cmp.sh
export EDITOR=mcedit
export HISTFILESIZE=10485760
export HISTSIZE=500000
export HISTCONTROL=ignoreboth:erasedups
export HISTIGNORE="history:reboot:poweroff:cd:ls:pwd:mc:ps:m:e:l"
export SSH_ASKPASS=
alias ffi='ffmpeg -hide_banner -i'
alias m='cd /mnt'
alias e='cd /etc'
alias l='cd /var/log'
tabs -4
```
## reboot
```bash
echo 1 > /proc/sys/kernel/sysrq
echo b > /proc/sysrq-trigger
```
## Motherboard name
```bash
cat /sys/devices/virtual/dmi/id/board_name
```
## grab video from screen
```bash
ffmpeg -s 1920x1080 -framerate 10 -f x11grab -i :0 -qscale 6 out.mkv
```
```bash
ps --ppid 2 -p 2 --deselect
```

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# Fedora / CentOS / Etc
## Relabel
```bash
touch /.autorelabel
```
## Install PHP 8
```
dnf install https://rpms.remirepo.net/fedora/remi-release-38.rpm
dnf module reset php
dnf module install php:remi-8.2
```

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# LVM
#### Extend
```bash
lvextend -L+1G /dev/vg4/homevol
```
# Btrfs
#### Resize
```bash
btrfs filesystem resize max /mnt/dmp/
```
#### Defragment / compress
```bash
btrfs filesystem defragment -v -clzo /boot/*
```
#### Set RO / RW
```bash
btrfs property set -f . ro false
btrfs property set -f . ro true
```
#### Create shapshot
```bash
btrfs subvolume snapshot xyz xyz-snapshot-path-name
```
#### Delete shapshot
```bash
btrfs subvolume delete xyz-snapshot-path-name
```
# Ext4
#### Resize
```bash
resize2fs /dev/device [size]
```
#### if superblock fail
```bash
dumpe2fs /dev/sda5 | grep -i backup
fsck -b 32768 /dev/sda5
```

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```
$ModLoad imudp
$UDPServerRun 514
template(name="cmpDate" type="list") {
property(name="timereported" dateformat="year")
constant(value="-")
property(name="timereported" dateformat="month")
constant(value="-")
property(name="timereported" dateformat="day")
}
set $.cmpDate = exec_template("cmpDate");
set $.cmpSuff = "default";
template(name="cmpOutFile" type="list") {
constant(value="/mnt/netlog/zzz/")
property(name="$.cmpDate")
constant(value="/")
# property(name="hostname")
property(name="fromhost-ip")
constant(value="-")
property(name="$.cmpSuff")
constant(value=".log")
}
template(name="cmpOutFmt" type="list") {
property(name="$.cmpDate")
constant(value=" ")
property(name="timereported" dateformat="hour")
constant(value=":")
property(name="timereported" dateformat="minute")
constant(value=":")
property(name="timereported" dateformat="second")
constant(value=" ")
property(name="hostname")
constant(value=" ")
property(name="syslogtag")
property(name="msg" spifno1stsp="on" )
property(name="msg" droplastlf="on" )
constant(value="\n")
}
if( $fromhost-ip == "127.0.0.1" ) then {
stop
}
if ( $fromhost-ip == "172.16.1.1" ) then {
if ( $syslogtag contains "teg3" ) then {
set $.cmpSuff = "teg3";
}
}
action(type="omfile" dynafile="cmpOutFile" template="cmpOutFmt")
stop
```

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# Nginx
```
# Allow open local port
semanage port -a -t http_port_t -p tcp 28081
# Allow open remote port
setsebool -P httpd_can_network_connect 1
```

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# Аппроксимация функции одной переменной
[https://planetcalc.ru/5992/](https://planetcalc.ru/5992/)

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# Crontab
```
# PATH=$PATH:/usr/local/bin
# LANG=
# LC_ALL=
### on reboot
# @reboot command
### on time
# * * * * * command
### | | | | |
### | | | | |
### | | | | |
### | | | | |--| 0-7 день недели
### | | | | |
### | | | |----| 1-12 месяц
### | | | |
### | | |------| 1-31 день месяца
### | | |
### | |--------| 0-23 часы
### | |
### |----------| 0-59 минуты
```

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```bash
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
```
Alternatively, if you are the root user, you can run:
```bash
export KUBECONFIG=/etc/kubernetes/admin.conf
```
You should now deploy a pod network to the cluster.
Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at:
https://kubernetes.io/docs/concepts/cluster-administration/addons/
Then you can join any number of worker nodes by running the following on each as root:
```bash
kubeadm join 10.0.0.1:6443 --token 000000.0000000000000000 \
--discovery-token-ca-cert-hash sha256:0000000000000000000000000000000000000000000000000000000000000000
```

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# MariaDB
## Create database, user and grand permission
```sql
CREATE DATABASE dbn CHARACTER SET utf8 COLLATE utf8_general_ci;
CREATE USER 'usr'@'localhost' IDENTIFIED BY 'pwd'; GRANT ALL PRIVILEGES ON dbn.* TO usr@localhost;
```

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# MC
## ~/.config/mc/ini
```ini
[Layout]
command_prompt=1
free_space=1
horizontal_equal=1
horizontal_split=0
keybar_visible=0
left_panel_size=104
menubar_visible=0
message_visible=0
output_lines=0
top_panel_size=1
vertical_equal=1
xterm_title=0
[Midnight-Commander]
use_internal_view=1
use_internal_edit=1
alternate_plus_minus=1
skin=darkfar
editor_ask_filename_before_edit=false
editor_backspace_through_tabs=false
editor_backup_extension=~
editor_check_new_line=false
editor_cursor_after_inserted_block=false
editor_cursor_beyond_eol=false
editor_drop_selection_on_copy=true
editor_edit_confirm_save=true
editor_fake_half_tabs=false
editor_filesize_threshold=64M
editor_fill_tabs_with_spaces=false
editor_group_undo=false
editor_line_state=false
editor_option_auto_para_formatting=false
editor_option_save_mode=0
editor_option_save_position=true
editor_option_typewriter_wrap=false
editor_persistent_selections=true
editor_return_does_auto_indent=true
editor_show_right_margin=false
editor_simple_statusbar=false
editor_state_full_filename=false
editor_stop_format_chars=-+*\\,.;:&>
editor_syntax_highlighting=true
editor_tab_spacing=4
editor_visible_spaces=true
editor_visible_tabs=false
editor_word_wrap_line_length=72
```

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# Connection start
```bash
nmcli con up ens18
```
# Connection modifity
```bash
ifc=eth0 \
nmcli con mod $ifc ipv4.addresses 172.16.23.56/24 && \
nmcli con mod $ifc ipv4.gateway 172.16.23.1 && \
nmcli con mod $ifc ipv4.dns 172.16.20.130 && \
nmcli con mod $ifc ipv4.method manual && \
nmcli con mod $ifc ipv6.method disable && \
nmcli con up $ifc restart && \
true
```
# Disable IPv6 for all
```
nmcli con show | awk '{if(NR > 1) { print $1; system("nmcli con mod " $1 " ipv6.method disable"); } }'
```
# Connection event
```bash
#!/bin/bash
# This is /etc/NetworkManager/dispatcher.d/0167-cmp.sh
# IFACE="$1" # DEVICE_IFACE
# EVENT="$2" # NM_DISPATCHER_ACTION
# - connectivity-change
# - down
# - up
# - vpn-down
# - vpn-up
#
#
if [ "${NM_DISPATCHER_ACTION}" = "connectivity-change" ]; then
if [ "${CONNECTIVITY_STATE}" = "FULL" ]; then
nmcli conn up ssh-37
exit 0
fi
if [ "${CONNECTIVITY_STATE}" = "LIMITED" ]; then
nmcli conn up ssh-37
exit 0
fi
if [ "${CONNECTIVITY_STATE}" = "NONE" ]; then
exit 0
fi
# exit 0
fi
if true; then
logger -t 0167-cmp.sh @=$@ "ENV" \
NM_DISPATCHER_ACTION=$NM_DISPATCHER_ACTION \
CONNECTION_UUID=$CONNECTION_UUID \
CONNECTION_ID=$CONNECTION_ID \
CONNECTION_DBUS_PATH=$CONNECTION_DBUS_PATH \
CONNECTION_FILENAME=$CONNECTION_FILENAME \
CONNECTION_EXTERNAL=$CONNECTION_EXTERNAL \
DEVICE_IFACE=$DEVICE_IFACE \
DEVICE_IP_IFACE=$DEVICE_IP_IFACE \
CONNECTIVITY_STATE=$CONNECTIVITY_STATE
fi
```

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## Set default timezone
```
printf '[Date]\ndate.timezone = Asia/Katmandu\n' > /etc/php.d/17-cmp-timezone.ini
```

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```bash
socat PTY,link=/dev/vmodem0,echo=0,waitslave TCP:10.0.0.1:333
```

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# SSH
## Generate public key from private
```
ssh-keygen -f id_rsa -y > id_rsa.pub
```
## Port forwarding
```bash
# forward : 172.16.0.1:80 -> 172.16.0.2 -> 127.0.0.1:4080
ssh -f -N -L 4080:172.16.0.1:80 172.16.0.2
```
## Allow old algorithm
```bash
ssh -oKexAlgorithms=+diffie-hellman-group1-sha1 -oHostKeyAlgorithms=+ssh-dss 172.16.0.1
```