This tip originally by Cygnus at http://www.parsed.org
You can use this in your shell dotfile (e.g. ’/.bash_profile’, ’/.zshrc’) to create a ‘screen’ session when you log in or reattach to an existing screen:

if [[ $TERM != 'screen' ]] ; then
    if [[ `screen -list | grep -v "No" | awk '$2 { print }' | wc -l` == 0 ]] ; then
        screen
    else
        screen -dr
    fi
fi

Badly formatted post broke our parser. Please edit!

You can eliminate matches on queries based on the name of the site. For example, to search on all sites except 'experts-exchange.com', use the following hyphen-prefixed 'site' string:

-site:experts-exchange.com "convert cstring to int "

Or you can only seach a specified site by removing the dash

site:planetargon.com "rails hosting"

Tip by xinu

Pktstat, http://www.adaptive-enterprises.com.au/~d/software/pktstat/, displays a real-time summary of packet activity on an interface. Each line displays the data rate associated with a particular class of packets. The class is determined by the packet header.

For example, 'pktstat -w1' will refresh once per second showing the average bandwidth usage and active connections:

# pktstat -w1

  interface: eth0 
  load averages: 285.9k 167.3k 67.3k bps 

    bps    % desc 
  466.8   0% arp 
             tcp 205.188.1.192:5190 <-> c-24-21-74-176:1472 
   6.0k   0% tcp c-24-21-74-176:3933 <-> host75:3724 
  63.5k   1% tcp c-24-21-74-176:4662 <-> p50906304:61951 
  27.4k   0% udp 10.141.192.1:bootps <-> 255.255.255.255:bootpc

If you've run a command that you discover needs a path, you can do something like this on the following line:

$ psql -U postgres mydb_here
bash: psql: command not found

$ /usr/local/pgsql/bin/!!
/usr/local/pgsql/bin/psql -U postgres mydb_here

Welcome to psql 7.3.5, the PostgreSQL interactive terminal.
mydb_here=#

Or if you mistyped the path:

$ /usr/loca/pgsql/bin/psql -U postgres mydb_here
-bash: /usr/loca/pgsql/bin/psql: No such file or directory

$ ^loca^local
usr/local/pgsql/bin/psql -U postgres mydb_here

Welcome to psql 7.3.5, the PostgreSQL interactive terminal.
mydb_here=#