[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]
! (exclamation point)
escaping for shells
excluding commands in sudoers file
preventing file inclusion in Tripwire database
"" (quotes, double), empty
"any" interface
"ring buffer" mode (for tethereal)
$! variable (Perl), for system error messages
%m format specifier to syslog to include system error messages
2nd
. (period), in search path
.gpg suffix (binary encrypted files)
.shosts file
/ (slash), beginning absolute directory names
/dev directory
/dev/null, redirecting standard input from
/proc files
filesystems
networking, important files for (/proc/net/tcp and /proc/net/udp)
/sbin/ifconfig
/sbin/ifdown
/sbin/ifup
/tmp/ls (malicious program)
/usr/share/ssl/cert.pem file
/var/account/pacct
/var/log/lastlog
/var/log/messages
/var/log/secure
unauthorized sudo attempts, listing
/var/log/utmp
/var/log/wtmp
: (colons), current directory in empty search path element
@ character, redirecting log messages to another machine
@otherhost syntax, syslog.conf
~/.ssh directory, creating and setting mode
~/.ssh/config file
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