**SYMBOLS**

**+ (addition operator), 236**

**[a-z] (alphabet inside brackets), 153**

**@ (at sign), 360**

**\> (backslash, greater than sign), 146**

**\< (backslash, less than sign), 146**

**{} (braces), 173**

**^ [] (caret before bracketed sequence), 152**

**:! (colon, exclamation point), 143**

**{} (curly bracket notation), 258–259**

**/ (division operator), 236**

**.. (double dot), 86**

**“ (double quotes), 310**

**= (equal sign), 360**

**> (greater than sign), 244–245**

**# (hashmark character), 227–228, 306**

**- (hyphen), 69**

*** (multiplication operator), 236**

**[0-9] (numbers inside brackets), 154**

**. (period or dot), 62, 86, 150, 310**

**+= (plus, equal sign), 360**

**?= (question mark, equal sign), 360**

**[] (square brackets), 111, 150**

**[^] (square brackets with caret between), 151**

**- (subtraction operator), 236**

**| (vertical line character), 114, 245**

A

**access control**

commands, scheduling (crontab), 208

group accounts, 30

one-time scheduling execution (at command), 211

user accounts, 30

**accidental deletion, recovering from (**restore **command), 338–340**

**accounts**

managing (useradd command), 41–43

root, 29

system, 30

user, 30

**acknowledgment number, 284**

**action, 270**

**addition operator (+), 236**

**address**

absolute and relative ...

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