You have a machine (a master host) with several idividually installed packages. You want those packages to be rebuilt somewhere else (slave host). Do this:

1. On the master host
# pkg_info -Q PKGPATH -a > pkgs_i_want_to_have
2. Copy the generated file to the slave host, and issue as root:
# cat pkgs_i_want_to_have | (while read pp ; do cd /usr/pkgsrc/$pp ; make && make install ; done)

Simple enough, eh?

If you want to see all symbols in a binary file, try this:

$ objdump -t -C <binary file>

Look up in the manpage for details!

openssl s_client -starttls smtp -crlf -connect mail.mysite.com:25

Use this command to list all listening IPV4 ports with ip and port numbers:

$ netstat -anl -f inet

$ tail -f file | grep --line-buffered my_pattern

You write your good program to use the rsyslogd installed on your system. You would have a bunch of log lines, but you can't see any. Check this:

Save this script into an sh file:

#!/usr/bin/env bash

DBNAME=$1
INFILE=$2

SED_FILTER="/^-- Current Database: \`$DBNAME\`/,/^-- Current Database: /p"

sed -n "$SED_FILTER" $INFILE > $DBNAME.sql

echo "Dump is ready: $DBNAME.sql"

exit 0

Run as :

$ sh script_name dbname full_dump_file

Put this line into your ~/.bashrc:

case "$TERM" in
rxvt|rxvt-unicode|xterm|vt100)
        export PS1="\[\e[1;32m\]\u@\[\e[1;33m\]\h\[\e[00m\]:\[\e[0;37m\]\w\[\e[00m\] \$ "
        export PROMPT_COMMAND='echo -ne "\e]0;${USER}@${HOSTNAME}: ${PWD}\007"'
        ;;
esac

After installing LXDE either from binary or from pkgsrc, it wouldn't start. Here is how to solve:

Put this line into your ~/.shrc:

export PS1="$(echo -e "\033[31m$(whoami)\033[00m@$(hostname -s): \$PWD $") "

Change coloring as you wish by tuning  \e[31m and \e[00m parts.

For color codes and further information see the link attached.