LlamaLabs

Instead of typing in the password to decrypt my private SSH key every time I want to ssh to a host I use a program called ssh-agent, which is included in the openssh-clients package in CentOS. When you run ssh-agent it creates a long-running process that holds decrypted keys and spits out some environment variables [...]

First, see what’s in the cache: $ dscacheutil -cachedump DirectoryService Cache Overview: AAAA Queries – Disabled (link-local IPv6 addresses) Buckets Used – 31 Cache Size – 16 Entry count by category: Group – 2 Host – 11 User – 3 Flush: $ dscacheutil -flushcache $ All gone: $ dscacheutil -cachedump DirectoryService Cache Overview: AAAA Queries [...]

Here’s another rpm command I can never remember. This lists all installed packages, and sorts the list based on installed size. rpm -qa –queryformat ‘%{SIZE} %{NAME} %{VENDOR}\n’ | sort -n The -qa flag specifies that we wish to query all packages. The –queryformat flag specifies how we want each result to be formatted. See below [...]