How To Pass and Parse Linux Bash Script Arguments and Parameters

Bash shell script to find out the largest value from given command line arguments

Last Updated : 05 Sep, 2019

Write a shell script to find out the largest value from the given number of command-line arguments.

Example:

Special variables in bash:

$@- All arguments.
$#- Number of arguments.
$0- Filename.
$1, $2, $3, $4 ... - Specific arguments.

Approach

If the number of arguments is 0, end the program.
If not zero, then
- Initialize a variable maxEle with first argument.
- Loop over all the arguments. Compare each argument with maxEle and update it if the argument is greater.

#Check if the number of arguments passed is zero 
if [ "$#" = 0 ] 
then
    #Script exits if no 
    #arguments passed 
    echo "No arguments passed."
    exit 1 
fi
  
#Initialize maxEle with  
#the first argument 
maxEle=$1 
  
#Loop that compares maxEle with the  
#passed arguments and updates it 
for arg in "$@"
do
    if [ "$arg" -gt "$maxEle" ] 
    then
        maxEle=$arg 
    fi
done
echo "Largest value among the arguments passed is: $maxEle"

How To Pass and Parse Linux Bash Script Arguments and Parameters

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