Index SYMBOL

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! (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