The environment variables are used by the shell and its child processes for normal execution of the programs. However, there are times when there is a need to add new variables for specific applications to work. First of all, check the environment parameters with ‘env’ command as shown below:
To add the parameter simply use the new parameter name and assign it a value. Lets say, we want to add a parameter called ‘NEWPARAM’ to the environment, first define the parameter as follows:
linux:~ #
linux:~ # NEWPARA=’test’
linux:~ #
Tags: add environment parameter, env, export
If you need to drop a table in informix and create it again, you require the script which was initially used to create that table. To get the SQL script, we use dbschema command. Most frequently, the command is used in the following format.
dbschema -d <database> -t <tablename> -ss <file_name>
|__ To Generate Server Specific Information
An example is given below:
The above command will take the backup of all the tables in the database smdb and store it in the file ‘smdb_20100624.sql’.
Tags: dbschema, sql script for tables
The file /etc/fstab contains the information about the mounted systems. The system reads this configuration at start-up to mount the required partitions on to the file system. An example of this file is shown below:
As you can see, this file has all the information about the mounted partitions. Now, you can take a separate backup of any of these partitions. For example,
linux # dd if=/dev/sda1 of=/dev/sda2
Tags: backup partition data, dd command, sfdisk