Miscellaneous Utilities

at	Executes commands at a specified timepage 665
cal	Displays a calendarpage 670
crontab	Maintains crontab filespage 697
diskutil	Checks, modifies, and repairs local volumespage 712
dmesg	Displays kernel messagespage 717
echo	Displays a messagepage 720
expr	Evaluates an expressionpage 722
sysctl	Displays and alters kernel variablespage 858
tee	Copies standard input to standard output and one or more filespage 867
test	Evaluates an expressionpage 871
tr	Replaces specified characterspage 879
tty	Displays the terminal pathnamepage 882
xargs	Converts standard input into command linespage 892