Linux:Bash Useful Tips

Debian: unattended dist upgrade

apt update && \
export DEBIAN_FRONTEND=noninteractive && \
apt -o Dpkg::Options::="--force-confdef" -o Dpkg::Options::="--force-confold" dist-upgrade -yq && \
apt autoremove --purge -y

Extending a LV (ext4/xfs) with all available space in one command

lvextend -l +100%FREE /dev/vg_base/var -r

Renaming multiple files with the same extension in CentOS

rename .ext .ext.bak *.ext

(!) Beware that the rename command may work differently acc. to your Linux distribution

snmp v3 command sample

snmpwalk -v3 -l authPriv -u <uid> -a SHA -A <pwd> -x DES -X <pwd> <fqdn/ip> <oid-optional>