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Code reuse |
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Why write code that we already wrote for previous programs? Well here is a small tip that might save you
some time: Make a generic file with reusable functions.
Many languages make this easy to do. Object oriented languages like Java or C++ for example allow you to
make a class with utility functions, and then import them in your main program. This way you can use the
generic class in all your programs. Even in C you can do this by including the generic C file when compiling
with a command like:
gcc -o myprogram myprogram.c generic.c
Your generic utility functions would be in generic.c and gcc would simply add the file to myprogram. |
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Domains to search in |
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When you try to access a Web site, or any remote site, you need to specify the full hostname. This means the
machine name plus the domain name:
lynx my.yahoo.com
If you have a few domain names that you access a lot, you can make your life easier. You can edit
/etc/resolv.conf and add the domains there:
search domain.net yahoo.com
This means that the system will search in those domains for hostnames. From now on type:
lynx my
The system will now look for "my", if that hostname doesn't exist it will look for "my.domain.net", and at
last "my.yahoo.com". |
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Internet for your LAN |
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Internet for your LAN
Many companies have local networks, and it is becoming even more popular in homes, where 2 or 3 systems
are linked together using ethernet wires. Most providers only offer 1 IP address per connection, which means
that you can't put all of the systems on the Internet at the same time, unless you use a special gateway.
Linux comes with something called IP-Masquerade. With it, you can assign LAN IPs, which are IPs that
can't go on the Internet directly, and then use the Linux system as a gateway. All you need to implement this
is a Linux system with 2 ethernet cards, and an Internet connection. The Linux system has IP-Masquerade
enabled, and the LAN systems will have access to the Internet using the Linux gateway as a transparant proxy
server.
You can find more on the subject by reading the IP-Masq HOWTO and other networking documentation at
http://metalab.unc.edu/pub/Linux/docs. You also need to make sure your Internet provider accepts this kind
of network on their connection. |
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Take Backp of MBR |
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MBR is in the first 446 bytes of the Hard Drive
The next 66 bytes consists of the partiton table
to take backup of the MBR to a file /root/hda_mbr
dd if=/dev/hda of=/root/hda_mbr bs=446 count=1
to replace with the backed up MBR,In case ypu deleted the MBR
dd if=/root/hda_mbr of=/dev/hda bs=446 count=1
bs=byte size
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Read more...
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rpm--->tgz in slackware |
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To convert rpm packages to tgz in slackware
run
rpm2tgz package.rpm
this will create the tgz packages
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