all: DOMAIN ?= karchnu.fr get-certificate-info: openssl s_client -connect $(DOMAIN):443 show-connected-ipv4: @# Don't forget the double $$ since we are in a Makefile. @netstat -n -p tcp | drop-until tcp | awk '{print $$5}' | cut -d. -f 1-4 | sort | uniq detect-volume: ffmpeg -i $(SRC) -af "volumedetect" -vn -sn -dn -f null /dev/null PORT ?= which-bin-uses-this-port: fstat | grep ':$(PORT)' MAIL_DOMAIN ?= mail.karchnu.fr verify-mail-certificate: echo | openssl s_client -starttls smtp -showcerts -connect $(MAIL_DOMAIN):587 -servername $(MAIL_DOMAIN) | openssl x509 -noout -dates verify-mail-imap-certificate: echo | openssl s_client -showcerts -connect $(MAIL_DOMAIN):993 -servername $(MAIL_DOMAIN) | openssl x509 -noout -dates