How do you store the results of Oracle SQL query in a variable in a shell script?

How do you store the results of Oracle SQL query in a variable in a shell script?

Linux: Store SQL Query Result in a Variable in Shell Script

1. SQL Query Returning Single Row (sqltest.sh)
2. Make the file executable.
3. Test.
4. Output.
5. The following example is to demonstrate how to store SQL query result into an array returning multiple rows.
6. Make it executable.
7. Test.
8. Output.

How do you execute a script command?

Steps to write and execute a script

1. Open the terminal. Go to the directory where you want to create your script.
2. Create a file with . sh extension.
3. Write the script in the file using an editor.
4. Make the script executable with command chmod +x .
5. Run the script using ./.

How do you store a command in a variable in Unix?

To store the output of a command in a variable, you can use the shell command substitution feature in the forms below: variable_name=$(command) variable_name=$(command [option …] arg1 arg2 …) OR variable_name=’command’ variable_name=’command [option …] arg1 arg2 …’

How to store a command in a variable?

Using this method, the command is immediately evaluated and it’s return value is stored. In the above example, if you need to run a command with arguments, put them in the string you are storing stored_date=”date -u” # For bash scripts this is rarely relevant, but one last note. Be careful with eval.

Why does Bash-C “$ ABC ” not work with eval?

With bash -c “$abc”, and eval “$abc”, there’s an additional shell processing step, which does make the quotes work, but also causes all shell expansions to be processed again, so there’s a risk of accidentally running e.g. a command substitution from user-provided data, unless you’re very careful about quoting.

Which is the safest way to run a command?

The safest way to run a (non-trivial) command is eval. Then you can write the command as you would do on the command line and it is executed exactly as if you had just entered it. But you have to quote everything.

Do you have to Eval all strings in Bash?

For bash scripts this is rarely relevant, but one last note. Be careful with eval. Eval only strings you control, never strings coming from an untrusted user or built from untrusted user input.