Bash: prefix private keychain fn with underscore.
Bash: handle updated ssh auth sock in tmux.
Bash: keychain plugin desc.
Bash: comment style.
Bash: add home bin dir to path.
Bash: no need for brace var ref.
Bash: ls alias.
Bash: bc alias.
Bash: cal alias.
Bash: use iso format for long ls listings.
Bash: editor env var.
Bash: less as pager with good defaults and coloring.