gojira

gojira is a command line interface to Atlassian Jira. It currently supports reading and updating of issues and comments. More features (search, comments) are planned.

'gem install gojira' should do the trick. This will install two executable links - 'gojira' and 'gj'.
gojira will look for a config file at ~/.gojira
expected format is:
full path to jira
username
password

• gojira i[ssues] - show all issues assigned to you
• gojira i[ssue] issue - show information about an issue with the given key
• gojira p[rojects] - show all projects on the current Jira instance
• gojira u[pdate] issue - show all valid actions that can be performed on an issue
• gojira u[pdate] issue action_id - move the issue to the specified status

issue => an internal gojira ID (ie. from 'gojira issues')
action_id => an internal gojira action_ID (ie. from 'gojira update issue')