In Linux/Unix, use set command to change the value of an argument/parameter in a shell script.
The arguments we pass to a shell script can be read using the shell variables $1, $2, depends on how many parameters you passed. Here you will learn how to change/assign a new value to these shell variables using the set command.
SET Command Example
The following is a shell script example, in which we will pass the two arguments, and it will print that argument values. Then the set command will change the value of these arguments and even create a new third argument.
setpar.sh
#!/bin/bash echo $1 echo $2 # assign a new value for argument $1 and $2 and create a new third argument set abc 123 xyz echo $1 echo $2 echo $3
Test by passing two arguments (1. hello, 2. world)
./setpar.sh hello world
Output
You can see below that first it printed the argument values you passed to the shell script, then it printed the newly assigned values to the arguments.
hello world abc 123 xyz