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Misc Oneliners

Tar Folder and copy to remote Machine

tar cf - /etc/ |ssh ${remote-host} "cd /tmp/ && cat > $(hostname)-etc.tar"

Tar & GZIP Folder and copy to remote Machine

tar czf - /etc/ |ssh ${remote-host} "cd /tmp/ && cat > $(hostname)-etc.tar.gz"

Dump Certs Chain

s=""; timeout 2 openssl s_client -servername ${s} -connect ${s}:443 -showcerts > /tmp/${s}.chain

selfsigned certificate for 1 year

cd /etc/ssl; openssl req -nodes -x509 -newkey rsa:4096 -keyout key.pem -out cert.pem -days 356

set default branch to main

git config --global init.defaultBranch main

bash - check multiple files

[ -f /etc/resolv.conf -a -f /etc/hosts ] && echo "Both files exist" || echo "One or Both Files are missing"

remove word ’nosuid’ on the line /var in /etc/fstab

sed -E -i.bak 's/(.*\/var.*)(,nosuid)(.*)/\1\3/' /etc/fstab

macos show hidden files

defaults write AppleShowAllFiles -boolean true; killall Finder



macos hide hidden files

defaults write AppleShowAllFiles -boolean false; killall Finder

Count Files per Directory

cd /usr; find . -type f |cut -d/ -f2 |sort |uniq -c

Resolve IP for FQDN and add to Table

fqdn=""; host $fqdn |awk '$0 ~ "has" {print $NF}' |map f 'doas /sbin/pfctl -t t_allow_ssh -T add $f'

or without map command

fqdn=""; host $fqdn |awk '$0 ~ "has" {print $NF}' |pfctl -t spammers -T add -f-

QRCode for SSH Key


qrencode -t UTF8 < ~/.ssh/


qrencode -t UTF8 < ~/.ssh/id_ed25519

QRCode for GPG Key


gpg --export --armor |sed "s/END PGP PUBLIC/END PGP \.\*/" |qrencode -o public.png


gpg --export-secret-keys --armor |sed "s/END PGP PRIVATE/END PGP \.\*/" |qrencode -Sv40 -o private.png

Convert CSV to JSON

cat LARGEFILE.csv |python3 -c 'import csv, json, sys; print(json.dumps([dict(r) for r in csv.DictReader(sys.stdin)]))' > LARGEFILE.json

Show your Python Path

python3 -c "import sys; print('\n'.join(sys.path))"

Any Comments ?

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