Linux Snippets

# Helpful bash/Linux commands # replace AAA with BBB in a bunch of files find . -type f -name "*" -exec sed -i 's!AAA!BBB!g' {} + # replace A with B in filenames (e.g. colons) rename 's|A|B|g' * # create SSH key ssh-keygen -t ed25519 -a 100 # Create service user on Ubuntu adduser --system --no-create-home --shell=/bin/false --group <NAME> # Create service user on Fedora sudo useradd -r -M -s /bin/false <NAME> # Recursively fix permissions (dirs / files) find . -type d -exec chmod 755 {} \; find . -type f -exec chmod 644 {} \; Apply git patch git apply --verbose file.patch # SELinux enable binary sudo semanage fcontext -a -t bin_t "/opt/bin/program" sudo restorecon -v /opt/bin/program