Shell Programming and Scripting

Quote:

Originally Posted by danmero

KISS principle states that design simplicity should be a key goal and unnecessary complexity avoided.

Code:

paste -d ' ' list1 list2

That works for that specific case, but doesn't address the general problem as originally posed.

Quote:

Originally Posted by Exolon

It seems you can't have multiple "x in y" terms in a for loop, so the next best thing is probably to rewrite the loop as an index iterator:

Code:

is=(a b c d)
js=(1 2 3 4)

for ((i = 0; i < 4; i++)) 
	do echo ${is[i]} ${js[i]}
done

It's not as nice, but still relatively easy to read, especially if you define your lists together.

That's OK, but not POSIX compatible.

And it would be better to use the actual size of the array, not a hard-coded value:

Code:

n=0
while [ $n -lt ${#is[@]} ]
do
  printf "%s %s\n" "${is[$n]}" "${js[$n]}"
  n=$(( $n + 1 ))
done

If you want it to be POSIX compliant:

Code:

is="a b c d"
js="1 2 3 4"
set -f
while [ -n "$is" ]
do
  set -- $is; i=$1; shift; is=$*
  set -- $js; j=$1; shift; js=$*
  printf "%s %s\n" "$i" "$j"
done

There's no need for echo and command substitution, and it will cause the script to fail if any of the arguments contain spaces.

Code:

array1=( "$@" )

The same here. In bash 4.0 you can do:

Code:

array2=( "${@^^}" )

I repeat, "use the actual size of the array":

Code:

number_of_elements=${#array[@]}