Linux/Snippets: Difference between revisions
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du -sh * | |||
clear; for each in $(ls) ; do du -hs "$each" ; done | clear; for each in $(ls) ; do du -hs "$each" ; done | ||
Latest revision as of 16:40, 6 September 2024
Hardware
- Motherboard
dmidecode -t 2
- HDD
fdisk -l lsblk smartctl -a /dev/sda lshw -c disk
Packages
List packages by size
dpkg-query --show --showformat='${Package;-50}\t${Installed-Size} ${Status}\n' | sort -k 2 -n | grep -v deinstall
Sum of all installed packages
dpkg-query --show --showformat='${Package;-50}\t${Installed-Size} ${Status}\n' | sort -k 2 -n | grep -v deinstall | awk '{s+=$2} END {printf "%.0f\n", s}'
remove old kernels
dpkg -l linux-* | awk '/^ii/{ print $2}' | grep -v -e `uname -r | cut -f1,2 -d"-"` | grep -e [0-9] | xargs sudo apt-get --dry-run remove
purge all removed packages
dpkg --list | grep "^rc" | cut -d " " -f 3 | xargs sudo dpkg --purge
Processes
Measure execution time
START=$(date +%s.%N) command END=$(date +%s.%N) DIFF=$(echo "$END - $START" | bc)
Wake-up and Shutdown
- shutdown and wake tomorrow
sudo rtcwake -m off -t $(data --date='1 day 6:00' +%s)
Files / Directories
Current script dir
currentpath=$(dirname "$0") cd $currentpath
List directory sizes
du -sh * clear; for each in $(ls) ; do du -hs "$each" ; done clear; for each in $(ls) ; do du -hs "$each" ; done | sort -hr
find file with content
grep -iR "$PATTERN" *
find top 10 largest directories
du -hsx * | sort -rh | head -10 h human readable s summarize x one-file-system r reverse h human-numeric-sort
find files bigger than 100MB
find . -type f -size +100M find . -type f -size +1G
find empty folders
find . -type d -empty -print find . -type d -empty -delete
clear file content
echo "" > filename or for i in *; do cat /dev/null > $i; done
rename directories with spaces to underlines
find -name "* *" -type d | rename 's/ /_/g'
HDD & SSD
show hdd power states
sudo hdparm -C /dev/sd?
set hdd spindown (rc.local)
hdparm -B 250 /dev/sd? hdparm -S 59 /dev/sd?
show SMART data
sudo smartctl -a /dev/sd?
check for bad sectors
fsck.ext4 -cDfty -C 0 /dev/sdxx
Manual SSD Trim
sudo fstrim -v /
Cron SSD Trim
- /etc/scripts/fstrim.sh:
#!/bin/sh # echo `date +"%d %b %H:%M:%S"` | tr -d '\n' >> /var/log/fstrim /sbin/fstrim -v / >> /var/log/fstrim
- /etc/cron.d/fstrim:
# 0 * * * * root /etc/scripts/fstrim.sh
delete folder by folder until enough free space (1G)
cd /srv/motion while [ `df | grep /dev/root | awk '{print $4}'` -lt 1000000 ]; do ls -r | tail -1 | xargs rm -r sleep 5 done
Shutdown computer if HDDs idle
UPTIME=$(cat /proc/uptime | cut -d ' ' -f 1 | cut -d '.' -f 1) if [ "$UPTIME" -lt "600" ] then exit fi lastSDB=$(cat /proc/diskstats | grep "sdb " | tr -s ' ' | cut -d ' ' -f 14 ) lastSDC=$(cat /proc/diskstats | grep "sdc " | tr -s ' ' | cut -d ' ' -f 14 ) lastSDD=$(cat /proc/diskstats | grep "sdd " | tr -s ' ' | cut -d ' ' -f 14 ) sleep 120 newSDB=$(cat /proc/diskstats | grep "sdb " | tr -s ' ' | cut -d ' ' -f 14 ) newSDC=$(cat /proc/diskstats | grep "sdc " | tr -s ' ' | cut -d ' ' -f 14 ) newSDD=$(cat /proc/diskstats | grep "sdd " | tr -s ' ' | cut -d ' ' -f 14 ) if [ "$lastSDB" = "$newSDB" ] && [ "$lastSDC" = "$newSDC" ] && [ "$lastSDD" = "$newSDD" ] then /sbin/shutdown -h now else echo "changes!!" fi
Format ext4 with disabled lazy init
mkfs.ext4 -E lazy_itable_init=0,lazy_journal_init=0 /dev/sda1
Multimedia
yt-dlp --no-keep-video --extract-audio --audio-format mp3 --audio-quality 0 https://www.youtube.com/watch?