bash script command line arguments – bash Scripting

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bash script arguments

Command Line Arguments in Bash script

You can easy way to pass command line arguments to bash shell script. These are useful to create a script more user-friendly dynamic. Learn All about the Bash command arguments below Details.

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Syntax:

$ ./myscript.sh ARG1 ARG2

You can with use special types bash arg, bash argv of the variables provided by the terminal, in your bash script code.

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bash script command line arguments – bash Scripting

bash script arguments example

here, Command line input arguments can be passed just after script your file name with space separated. If any argument have with space, update them under provides single or double quote. Read below bash-scripting simple script.

#!/bin/bash
 
### Print total input arguments with their varible values
 
echo "Total Arguments:" $#
echo "All Arguments values:" [email protected]
 
### Command arguments can be get as
 
echo "First->"  $1
echo "Second->" $2
 
# You can also get the all arguments in an array as well as use them varible in a script.
 
args=("[email protected]")
echo "First->"  ${args[0]} 
echo "Second->" ${args[1]}

Last step to run or execute this base script with Two input arguments read with get the following outputs.

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$ ./arguments.sh Hello PakaInfo

Results:

[email protected] : ~# 
[email protected] : ~# 
[email protected] : ~# ./arguments.sh Hello PakaInfo 
Total Arguments : 2 
All Arguments values : Hello PakaInfo 
First-> Hello
Second->PakaInfo 
First-> Hello
Second->PakaInfo
[email protected] : ~#
[email protected] : ~#

Bash scripts are generally used to perform a variety of run time input tasks. These bellow examples information differents ways you can work with CMD to your get results command line input arguments.

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bash command line arguments

Pass arguments through to another program

Bash scripts are always used as wrappers to launch second fresh application. A common task is to pass the input command line arguments from the shell Based script to the Example being loaded. Here is best way to perform demo of passing all the commandline arguments supported as-is.

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#!/bin/bash
# print_args.sh
echo "You supported the arguments:" "[email protected]"

# You could pass all commandline arguments to second Example like this
# myProgram "[email protected]"

Get the number of arguments passed

The number of commandline arguments passed is saved or included in the $# variable.

#!/bin/bash
echo "You provided $# arguments"

Accessing a specific argument by index

You can get a specific argument by its index like this:

#!/bin/bash
echo "parameters 0: $0"
echo "parameters 1: $1"
echo "parameters 2: $2"

Base Argument 0 is the name of the script accept arguments being invoked itself.

Iterating through each argument

This example displays how to repeat through each read argument one-by-one, as well as print out the shell value.

#!/bin/bash
for parameters in "[email protected]"
do
    echo "$parameters"
done

Check arguments for specific value

If you wanted to repeat through each argument as well as check or read if one equals a particular data value, you can do that simple base code with the following Example:

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#!/bin/bash
for parameters in "[email protected]"
do
    if [ "$parameters" == "--help" ] || [ "$parameters" == "-h" ]
    then
        echo "Useful Example of the argument detected."
    fi
done

Ensure the bash args script has the executable or run this example get the permission, as well as run it with a some pass commandline arguments to bash script.

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