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Shell Script Parameters

A bash shell script have parameters. These parameters start from $1 to $9.

When we pass arguments into the command line interface, a positional parameter is assigned to these arguments through the shell.

The first argument is assigned as $1, second argument is assigned as $2 and so on...

If there are more than 9 arguments, then tenth or onwards arguments can't be assigned as $10 or $11.

You have to either process or save the $1 parameter, then with the help of shift command drop parameter 1 and move all other arguments down by one. It will make $10 as $9, $9 as $8 and so on.

Shell Parameters

Parameters Function
$1-$9 Represent positional parameters for arguments one to nine
${10}-${n} Represent positional parameters for arguments after nine
$0 Represent name of the script
$∗ Represent all the arguments as a single string
$@ Same as $∗, but differ when enclosed in (")
$# Represent total number of arguments
$$ PID of the script
$? Represent last return code

Example:

Linux Shell Scripting parameters 1

Look at the above snapshot, this is the script we have written to show the different parameters.

Linux  Script parameters 2

Look at the above snapshot, we have passed arguments 1, 5, 90. All the parameters show their value when script is run.





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