When you connect to a command line for the first time, the working directory typically starts at your user account's ''home directory''. This is the folder in which your user account is allowed to create files and otherwise do all kinds of other work. Most computers today have this concept; on Windows computers, your home directory is typically displayed as a folder icon with a name like ''Joe's Documents''. On Mac OS X computers, the home directory is typically displayed as a house icon with the same name as your login.

Unexpected non-MediaWiki exception encountered, of type "Error"
Error: Call to undefined function each() in /apps/xmlpipedb/biodb/fall2013/includes/diff/DairikiDiff.php:374
Stack trace:
#0 /apps/xmlpipedb/biodb/fall2013/includes/diff/DairikiDiff.php(480): _DiffEngine->_diag()
#1 /apps/xmlpipedb/biodb/fall2013/includes/diff/DairikiDiff.php(291): _DiffEngine->_compareseq()
#2 /apps/xmlpipedb/biodb/fall2013/includes/diff/DairikiDiff.php(175): _DiffEngine->diff_local()
#3 /apps/xmlpipedb/biodb/fall2013/includes/diff/DairikiDiff.php(653): _DiffEngine->diff()
#4 /apps/xmlpipedb/biodb/fall2013/includes/diff/DairikiDiff.php(820): Diff->__construct()
#5 /apps/xmlpipedb/biodb/fall2013/includes/diff/DairikiDiff.php(1240): MappedDiff->__construct()
#6 /apps/xmlpipedb/biodb/fall2013/includes/diff/DairikiDiff.php(1458): WordLevelDiff->__construct()
#7 /apps/xmlpipedb/biodb/fall2013/includes/diff/DairikiDiff.php(952): TableDiffFormatter->_changed()
#8 /apps/xmlpipedb/biodb/fall2013/includes/diff/DairikiDiff.php(895): DiffFormatter->_block()
#9 /apps/xmlpipedb/biodb/fall2013/includes/diff/DifferenceEngine.php(765): DiffFormatter->format()
#10 /apps/xmlpipedb/biodb/fall2013/includes/diff/DifferenceEngine.php(655): DifferenceEngine->generateDiffBody()
#11 /apps/xmlpipedb/biodb/fall2013/includes/diff/DifferenceEngine.php(593): DifferenceEngine->getDiffBody()
#12 /apps/xmlpipedb/biodb/fall2013/includes/diff/DifferenceEngine.php(566): DifferenceEngine->getDiff()
#13 /apps/xmlpipedb/biodb/fall2013/includes/diff/DifferenceEngine.php(409): DifferenceEngine->showDiff()
#14 /apps/xmlpipedb/biodb/fall2013/includes/Article.php(725): DifferenceEngine->showDiffPage()
#15 /apps/xmlpipedb/biodb/fall2013/includes/Article.php(478): Article->showDiffPage()
#16 /apps/xmlpipedb/biodb/fall2013/includes/actions/ViewAction.php(37): Article->view()
#17 /apps/xmlpipedb/biodb/fall2013/includes/Wiki.php(427): ViewAction->show()
#18 /apps/xmlpipedb/biodb/fall2013/includes/Wiki.php(304): MediaWiki->performAction()
#19 /apps/xmlpipedb/biodb/fall2013/includes/Wiki.php(536): MediaWiki->performRequest()
#20 /apps/xmlpipedb/biodb/fall2013/includes/Wiki.php(446): MediaWiki->main()
#21 /apps/xmlpipedb/biodb/fall2013/index.php(59): MediaWiki->run()
#22 {main}