Linux

find . -type d -name "xxx"

find . -type f -exec chmod -x {} \;

Pour traiter les répertoires : -type d

find . -maxdepth 1 -type d -newermt 2018-01-03 | cut -d'/' -f 6 | grep 2017

find . -maxdepth 1 -type d | grep -Ev "/[0-9]{4}$" | xargs rmdir

-Ev : Expression régulière étendue + résultat inversé

find /path/to/files/ -name *.log* | xargs du -hs --total | tail -1

sed -i 's/regex/string/g' file

cat infile | sed 's/regex1/string/' | sed -r 's/re\(g\)ex2/\str\1ing/' > outfile

-E, -r, –regexp-extended

Script de sauvegarde

#!/bin/bash

# A script to perform incremental backups using rsync

set -o errexit
set -o nounset
set -o pipefail

readonly SOURCE_DIR="${HOME}"
readonly BACKUP_DIR="/mnt/data/backups"
readonly DATETIME="$(date '+%Y-%m-%d_%H:%M:%S')"
readonly BACKUP_PATH="${BACKUP_DIR}/${DATETIME}"
readonly LATEST_LINK="${BACKUP_DIR}/latest"

mkdir -p "${BACKUP_DIR}"

rsync -av --delete \
  "${SOURCE_DIR}/" \
  --link-dest "${LATEST_LINK}" \
  --exclude=".cache" \
  "${BACKUP_PATH}"

rm -rf "${LATEST_LINK}"
ln -s "${BACKUP_PATH}" "${LATEST_LINK}"

# crontab -e
# 0 */12 * * * /path/to/backup-script.sh

file -i file.txt

ou

uchardet file.txt

sed -i '1s/^\(\xef\xbb\xbf\)\?/\xef\xbb\xbf/' file.txt

echo "gromf!" 2>&1 | tee log.out

tail -f /var/log/haproxy.log | pv --line-mode --rate > /dev/null

A adapter selon le disque à redimensionner.

Initier un scan des nouvelles caractéristiques du disque :

echo 1 > /sys/class/block/sda/device/rescan

Vérifier la prise en compte de la demande de scan :

dmesg
[9937790.353627] sd 0:0:2:0: [sda] 419430400 512-byte logical blocks: (215 GB/200 GiB)
[9937790.353767] sda: detected capacity change from 209715200 to 419430400

Si nécessaire, installer growpart.
Sous Debian :

apt install cloud-utils

Agrandir la partition :

growpart /dev/sda 1

Agrandir le système de fichier :

resize2fs /dev/sda1

Pour automatiser le processus, il est possible de planifier l'exécution d'un script.
Attention, le script n'a pas été testé !
Source : https://codenotary.com/blog/enlarge-a-disk-and-partition-of-any-linux-vm-without-a-reboot
Par exemple, créer la tâche planifiée suivante dans /etc/cron.d/resize_disk :

*/5 * * * *   root   /usr/local/bin/disk_resize.sh

Contenu de disk_resize.sh :

#!/bin/bash
LOGFILE=/data/log/speed/resize.log
LOCKFILE=/tmp/enlarge.lock
export PATH=/usr/sbin:/usr/bin:/sbin:/bin

dotlockfile -r 0 $LOCKFILE || exit 1

echo 1 > /sys/class/block/sda/device/rescan
sleep 5
GROWPART_OUT=`growpart /dev/sda 2`
if [ $? -eq 0 ]; then
    echo `date` >> $LOGFILE
    echo "trying to resize fs" >> $LOGFILE
    echo $GROWPART_OUT >> $LOGFILE
    resize2fs /dev/sda2 >> $LOGFILE 2>&1
    echo `date` >> $LOGFILE
    echo "resize done" >> $LOGFILE
fi

echo 1 2>/dev/null >/sys/class/block/sdb/device/rescan
sleep 5
GROWPART_OUT=`growpart /dev/sdb 1`
if [ $? -eq 0 ]; then
    echo `date` >> $LOGFILE
    echo "trying to resize fs" >> $LOGFILE
    echo $GROWPART_OUT >> $LOGFILE
    resize2fs /dev/sdb1 >> $LOGFILE 2>&1
    echo `date` >> $LOGFILE
    echo "resize done" >> $LOGFILE
fi

dotlockfile -u $LOCKFILE

duc index -x --exclude=/dev --exclude=/proc --exclude=/sys --exclude=/net --exclude=/run -v --debug /

watch -n 1 "ls -lh /root/.cache/duc | awk '{print \$5}'"

usermod -aG <GROUP> <USER>

usermod -L -e 1 <USER>

-e 1 : Date d'expiration au 02/01/1970 → Désactivation définitive

kill $(ps aux |grep -i illustrator | awk '{print $2}')

read -p "Veuillez saisir du texte" VAR

read -s -p "Mot de passe :" PASSWD

shutdown -h now

OU

init 0

• 0 — Arrêt.
• 1 — Mode texte mono-utilisateur.
• 2 — Pas utilisé
• 3 — Mode texte multi-utilisateurs complet.
• 4 — Pas utilisé
• 5 — Mode graphique multi-utilisateurs complet (avec un écran de connexion de type X Window)
• 6 — Redémarrage.

Libération du bail

sudo  dhclient -r

Obtention d'un nouveau bail

sudo  dhclient

/etc/default/grub

GRUB_CMDLINE_LINUX_DEFAULT="ipv6.disable=1"

update-grub

/etc/netconfig

#udp6       tpi_clts      v     inet6    udp     -       -
#tcp6       tpi_cots_ord  v     inet6    tcp     -       -

sudo vim /etc/sysctl.d/60-custom.conf

net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1

sudo sysctl -p
sudo systemctl restart procps

cat /proc/sys/net/ipv6/conf/all/disable_ipv6
1

dpkg-reconfigure keyboard-configuration

perl: warning: Please check that your locale settings:
        LANGUAGE = (unset),
        LC_ALL = (unset),
        LC_TIME = "fr_FR.UTF-8",
        LC_MONETARY = "fr_FR.UTF-8",
        LC_ADDRESS = "fr_FR.UTF-8",
        LC_TELEPHONE = "fr_FR.UTF-8",
        LC_NAME = "fr_FR.UTF-8",
        LC_MEASUREMENT = "fr_FR.UTF-8",
        LC_IDENTIFICATION = "fr_FR.UTF-8",
        LC_NUMERIC = "fr_FR.UTF-8",
        LC_PAPER = "fr_FR.UTF-8",
        LANG = "en_GB.UTF-8"
    are supported and installed on your system.

sudo locale-gen fr_FR.UTF-8
sudo dpkg-reconfigure locales

La commande consiste simplement à ajouter l'utilisateur au groupe sudo.

usermod -aG sudo <USER>

sudo visudo

Defaults        timestamp_timeout=3600

-1 : illimité

Pour un utilisateur en particulier :

Defaults:username    timestamp_timeout=3600

echo 'Defaults !pwfeedback'|sudo tee /etc/sudoers.d/0pwfeedback

Le nom du fichier 0pwfeedback peut être à adapter selon les configurations.

su - <USER> -c "<COMMAND>"

su -g <GROUP> <USER> -s /bin/bash -c "<COMMAND>"

for i in {1..n}; do command; done;

watch -n 1 date

echo $(dpkg --list | grep linux-image | awk '{ print $2 }' | sort -V | sed -n '/'`uname -r`'/q;p') $(dpkg --list | grep linux-headers | awk '{ print $2 }' | sort -V | sed -n '/'"$(uname -r | sed "s/\([0-9.-]*\)-\([^0-9]\+\)/\1/")"'/q;p') | xargs sudo apt-get -y purge
sudo apt autoremove --purge

sudo xauth add $(xauth -f ~befe/.Xauthority list|tail -1)

mcd() { mkdir "$@" 2> >(sed s/mkdir/mcd/ 1>&2) && cd "$_"; }

fwupdmgr get-upgrades