CODEWITHSUNDEEP
linuxbashshellxargsgnu-parallel
spring cc
spring cc

Reputation: 1027

How to use the arguments from `xargs` as the index of an array

I want to use the aruments from the xargs as the index of this array, this is the scripts:

1 #!/bin/bash
2 array[0]=x
3 array[1]=y
4 echo array : ${array[0]}, ${array[1]}
5 echo -n {0..1} | xargs -I index -d" " echo index,${array[index]}

and this is the output:

[usr@linux scripts]$ sh test.sh 
array : x, y
0,x
1,x

you can see that the array can not accept the index correctly, it's always the first. How can I get this kind of output:

array : x, y
0,x
1,y

I showed the example with the command echo, however, my real aim is for another command, like this :

echo -n {0..1} | xargs -I index -d" " somecommand ${array[index]}

so that I want a general solution of this question.
And I also tried the parallel instead of the xargs, it's have the same problem.

Upvotes: 3

Views: 3035

Answers (2)

Ole Tange
Ole Tange

Reputation: 33685

With GNU Parallel you can do:

#!/bin/bash

. `which env_parallel.bash`

array[0]=x
array[1]=y
echo array : ${array[0]}, ${array[1]}
echo -n {0..1} | env_parallel -d" " echo '{},${array[{}]}'
# or
echo -n {0..1} | env_parallel --env array -d" " echo '{},${array[{}]}'

Your problem boils to exporting arrays, which you cannot do without cheating: Exporting an array in bash script

Upvotes: 1

Ipor Sircer
Ipor Sircer

Reputation: 3141

for i in `seq 0 $[${#array[@]}-1]`;do echo $i,${array[$i]};done|xargs -n1 echo

Upvotes: 1

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