Index_U

U

umask value, 48

Unimplemented command, 170

uniq command, 174

UNIX, tweaking, 93 “110

compressed files

ensuring maximally, 107 “9

working with, 104 “7

displaying files with, 94 “96

emulating GNU-style flags with quota, 98 “100

fixing grep, 102 “4

making sftp look like ftp, 100 “101

wrapping long lines, 97 “98

unpacker script, 272 “75

unrm script, 49 “53

Unscramble word game, 316 “19

updatecounter script, 223 “25

URLs, extracting from web pages, 175 “78

user accounts

deleting, 129 “31

listing all, 241 “42

suspending, 127 “29

user commands, 43 “70

archiving files as removed, 47 “49

displaying contents of directories, 56 “58

displaying time in different time zones, 66 “69

emulating DIR environment, 61 “63

formatting long lines, 45 “47

locating files by filename, 58 “61

logging file removals, 54 “55

man page database, 63 “66

working with removed file archive, 49 “53

user environment, 132 “35

users

See also system administration

adding to Mac OS X system, 302 “7

managing, 111 “36

adding users to system, 124 “27

analyzing disk usage, 113 “14

cleaning up after guests leave, 135 “36

deleting user accounts, 129 “31

figuring out available disk space, 117 “18

implementing secure locate, 120 “24

improving readability of df output, 118 “20

reporting disk hogs, 115 “17

suspending user accounts, 127 “29

validating user environment, 132 “35

NetInfo, 300 “302

tracking ID applications, 138 “39

validating crontab entries, 147 “52

code, 148 “50

hacking script, 152

how works, 151

results of script, 151

validating environment, 132 “35

web and Internet users, 165 “200

calculating currency values, 188 “92

calculating time spent online, 166 “68

checking overdue books at library, 182 “86

defining words online, 178 “80

downloading files via ftp, 169 “72

extracting URLs from web pages, 175 “78

movie info from IMDb, 186 “88

tracking BBC news with lynx, 172 “75

tracking changes on web pages, 196 “200

tracking stock portfolio, 193 “95

tracking weather, 180 “82

/users directory, 113

utilities, creating, 71 “92

adding local dictionary to spell, 80 “82

calculating loan payments, 84 “86

checking spelling of individual words, 75 “76

converting temperatures , 82 “84

interactive calculator, 73 “75

keeping track of events, 86 “91

reminder utility, 72 “73

Shpell interactive spell-checking facility, 77 “80

uuencode program, 270