Index[SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [X] [Z] u command UDP ( User Datagram Protocol) UFS partitions uid (user ID) umask command changing shell's effect on new file permissions file permissions assigned by undoing changes in vi uniq command Unix manual about displaying page of getting help for Darwin-only Unix commands help for commands 2nd illustrated printing pages searching for man page sections of Mac OS X/BSD shell using Unix. [See also configuring Unix environments] about about multiuser environments capabilities of Mac OS X changes to Mac OS filesystem and files command names in commands as separate programs in Darwin-only Unix commands directories in Aqua and editing files from command line editing text from command line file permissions and ownership filename case sensitivity in files and directories in Aqua and hierarchy of files and folders in 2nd history of key development dates listing basic commands Mac applications vs. commands in moving files to Trash parent and children processes preemptive multitasking 2nd 3rd preserving resource fork with files 2nd programming and scripting in puns and word games in putting command in background root accounts ssh connections within stability on Mac OS X text files in Mac and user name and ID users and groups in using command line versions of 2nd viewing file-type information unlocking files 2nd unpacking compressed tar files UPDATE statement updating finding security updates online packages passwords for keychain Perl modules upgrading CPAN uploading files to FTP servers 2nd uptime command 2nd URLs, fetching and saving user accounts. [See also managing user accounts and groups] about adding to existing groups admin user accounts changing login shell configuring access control for MySQL database creating 2nd file ownership information for forwarding e-mail for existing FTP-only monitoring login history name and number of removing restricting use of cron root accounts seeing all groups user belongs to seeing list of users logged in setuid properties for ownership switching to other system viewing all user ID user private group 2nd users command users. [See user accounts] utilities [See also specific utilities] awk program compressing files with gzip cut command 2nd defined find command ftp grep locate command Lynx mail command mdfind command 2nd 3rd Network Utility open command osascript command packet sniffers and port scanners pbcopy command pbpaste command Perl pine command scp scripting new sed sort command ssh tar command telnet textutil command uncompressing files with gunzip uniq command unpacking tar archive viewing and editing files wc command |