CODEWITHSUNDEEP
linuxbashshellksh
maihabunash
maihabunash

Reputation: 1702

run shell script with arguments manipulation

I need to get three arguments by test.ksh script as the following

  ./test.ksh 12 34 AN

is it possible to set the argument by counter for example ? 

for get_arg 1 2 3
do
my_array[get_arg]=$$get_arg 

print ${my_array[get_arg]}
done

in this example I want to get three arguments from the user by loop counter "$$get_arg" in place of $1 $2 $3

is it possible? and how ?

Upvotes: 0

Views: 672

Answers (4)

mohit
mohit

Reputation: 6064

Even you don't need in $@, this would work the same:

#!/bin/bash

i=0
for arg; do
    my_array[i]="$arg"
    echo "${my_array[i]}"
    (( i++ ))
done

That is,

if in words is not present, the for command executes the commands once for each positional parameter that is set, as if in $@ had been specified.

Upvotes: 0

Jonathan Leffler
Jonathan Leffler

Reputation: 754490

my_array=("$@")

for i in 0 1 2
do
    echo "${my_array[$i]}"
done

This assigns all the arguments to array my_array; the loop then selects the first three arguments for echoing.

If you're sure you want the first three arguments in the array, you could use:

my_array=("$1" "$2" "$3")

If you want the 3 arguments at positions 1, 2, 3 in the array (rather than 0, 1, 2), then use:

# One or the other but not both of the two assignments
my_array=("dummy" "$@")
my_array=("dummy" "$1" "$2" "$3")

for i in 1 2 3
do
    echo "${my_array[$i]}"
done

Upvotes: 1

Chris Montanaro
Chris Montanaro

Reputation: 18232

Edit: My bad ksh:

for arg;do
   print $arg
done

Original Post: Use shift to iterate through shell script parameters:

# cat test.sh 
#!/bin/bash

while [ "$1" != "" ]; do
    echo $1
    shift
done

test run:

# ./test.sh arg1 monkey arg3
arg1
monkey
arg3

source

Upvotes: 0

Sven
Sven

Reputation: 1768

bash has a special variable 

$@

which contains the arguments of the script it currently executes. I think this is what your'e looking for:

for arg in $@ ; do 
    # code
done

Upvotes: 0

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