I have two variables, multi-line.
VAR1="1
2
3
4"
VAR2="ao
ad
af
ae"
I want to get
VAR3="1ao
2ad
3af
4ae"
I know I can do it by:
echo "$VAR1" > /tmp/order
echo "$VAR2" | paste /tmp/order -
But is there any way to do without a temp file?
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2 Answers
paste <(echo "$VAR1") <(echo "$VAR2") --delimiters ''
5 Comments
Kurtis Nusbaum
what's the <() operator called?
dgo.a
@KurtisNusbaum "<()" is called a "process substitution". Not all shells support it, but most popular ones do: google.com/search?q=process+substitution
msimmer92
This is not working for me in Linux (Ubuntu 18.04.1 LTS). The paste line gives the following error: script.sh: 11: script.sh: Syntax error: "(" unexpected.
iamyojimbo
On OSX, I had to do
paste --d '' <(echo "$VAR1") <(echo "$VAR2"). Using either the --delimiters arg, or putting it at the end of the command gave me errors about No such file or directory.
Henrique Mattos
I was having the same problem as @iamyojimbo on macOS and using
--d gave me paste: illegal option -- - usage: paste [-s] [-d delimiters] file ... . Using -d resolved itYou can say:
$ VAR3=$(paste <(echo "$VAR1") <(echo "$VAR2"))
$ echo "$VAR3"
1 ao
2 ad
3 af
4 ae
It's not clear whether you want spaces in the resulting array or not. Your example that works would contain spaces as in the above case.
If you don't want spaces, i.e. 1ao instead of 1 ao, then you can say:
$ VAR3=$(paste <(echo "$VAR1") <(echo "$VAR2") -d '')
$ echo "$VAR3"
1ao
2ad
3af
4ae
