Check which services are enabled/disabled on your Ubuntu System

There are various services that an OS provides. If it is Ubuntu then you may at times want to know which one is enabled and which one is not. The best way to know it is chkconfig.
chkconfig provides a simple command-line tool for maintaining the /etc/rc[0-6].d directory heirarchi by relieving system administrators of the task of directly manipulating the numerous symbolic links in those directories. chkconfig has five distinct functions: adding new services for management, removing servicesfrom management, listing the current startup information for services, changing the startup information for services, and checking the startup state of a particular service.
When chkconfig is run without any options, it displays usage information.
To install chkconfig on Ubuntu

sudo apt-get install chkconfig

To check which services are enabled, just type chkconfig in the terminal and press return. It will list all the services available.
chkconfig can be used with options. More can be learnt from the man pages or here.

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Working with LEX & YACC programs in Ubuntu.

You might have wondered why LEX and YACC programs will not work in LINUX even if have written your program correctly. Well, no need to worry. Just a simple 3-4 steps will successfully execute your programs.

Steps goes like this :---

1. Go to terminal and enter the following command. sudo apt-get install build-essential


2. Then type sudo apt-get install flex(For lex programs).


3. Again type sudo apt-get install bison(For yacc programs).

If you carry out above process, you will be done with configuring FLEX and BISON.  Now you will be able to execute your lex and yacc programs.

Thank you :)

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