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] ! (bang) # (sharp) #! (shebang) $@ variable $USER environment variable 2nd & (ampersand) * (asterisk) cautions using function of 2nd matching characters with 2nd --help option -aux options -help option -k option -s option 2nd . (direct) command 2nd . command 2nd . directories 2nd .. directories 2nd ./configure shell scripts 2nd .Trash directory / (forward slash) escaping with \ searching forward in text strings searching relative or absolute paths using in pathnames 2nd using with relative and full paths /bin directory about creating personal /etc/crontab files /etc/ ftpchroot / command /etc/hostconfig system-configuration file ' ' (single quotes) escaping with \ 2nd protecting spaces with " " (double quotes) escaping with \ 2nd protecting spaces with : ( colon ) :w command < character > character redirecting output setting environment variables with >> character appending to existing file 2nd redirecting output 2nd setting environment variables with ? (question mark) entering as command searching backward in text strings [ ] (square brackets) creating character class with function of text expressions for conditional structures \ (backslash) escape sequences for bash escaping / character with escaping quotes with 2nd protecting spaces with ^ (caret) ` (backquote) 2nd 3rd { } (curly brackets) (pipe) ~ (tilde) changing case of character under cursor representing home directory with |