MyLinuxCheatSheet v19-02-12

Image source: Willi Glenz - Screenshot rate.sx/steem@7d

$ task calendar 2019
$ man hier; man ascii
$ mail; from
# task 1 edit
# visudo // # vim /etc/sudoers

# crontab -e
# chown userXYZ file.txt
$ dd if=/dev/cdrom of=/tmp/isofile.iso
$ df -hT
$ dpkg -L vim-doc
# du -hs / 2> /dev/null
$ du -h --max-depth=1 | sort -rh
$ du -b --max-depth 1 | sort -nr | perl -pe 's{([0-9]+)}{sprintf "%.1f%s", $1>=2**30? ($1/2**30, "G"): $1>=2**20? ($1/2**20, "M"): $1>=2**10? ($1/2**10, "K"): ($1, "")}e'
$ for x in *; do mv "$x" "${x,,}"; done
$ hostname; hostname -d; hostname -f; hostname -i
$ java -jar filename.jar
$ sort -t: -k1 -n /etc/passwd
$ stat /home/user
$ tree ~/Downloads
$ type date
$ type echo
$ ls -l | xsel --clipboard
# visudo 
> Defaults:userxyz timestamp_timeout=30
$ watch -d -n 5 ls -l

BACKUP
$ archivemount archive.tar.gz ~/mnt/
# dd if=/dev/sdABC of=/dev/sdXYZ bs=64K conv=noerror,sync
$ tar -cvzf ~/backup/backup.tar.gz ~/java
$ tar -tvf backup.tar.gz
$ ssh user@a.b.c.d "tar -zcf - /home/user/scripte" > scripte.tar.gz

FIND
$ find -size +100M | less
# find /home -user userxyz -size +1G
$ find . -name "*.jpg" -exec convert {} -scale 50% +repage {} \;
$ find ~ -maxdepth 1 -type f -exec grep "^alias " '{}' \; -print
$ find ~ -maxdepth 1 -type f -mtime 3
$ find ~ -maxdepth 1 -type f -exec grep "^alias " '{}' \; -print
# find / -uid 1000 -exec chown -v 1002:1002 {} \;
# find / -user userxyz -type f -exec rm -f {} \;
$ find /etc -type f -print 2> /dev/null | less
$ find /etc/*tab -type f -print
# find /home -user userxyz -mtime -3

MAIL
# apt-get install mailutils-doc; info mailutils
$ mail
$ from

MD5SUM
$ md5sum abc.txt
$ md5sum abc.txt > abc.md5
$ md5sum -c abc.md5

SERVICES
# service --status-all | less
# service cron status