awk opposite of split

Question

what would be an opposite of split() in awk? Imagine I have array containig characters/integers.

What I\'ve tried:

color =          


        

Answer 1

Here is a way with POSIX Awk:

br = "red,orange,yellow,green,blue"
ch = split(br, de, ",")
print "original: " br
printf "joined: "
for (ec in de) printf ec == ch ? de[ec] "\n" : de[ec] "-"

Output:

original: red,orange,yellow,green,blue
joined: red-orange-yellow-green-blue

Answer 2

Knowing that the opposite of split() is join(), a mere Google Search gives me this page, which seems to contain the solution : http://www.gnu.org/software/gawk/manual/html_node/Join-Function.html . It joins all the elements of an array together, and returns the corresponding string.

['f','o','o'] => "foo"

Have fun

Answer 3

What you want (in your loop) is string concatenation.

Answer 4

Using GNU awk 4.1

#!/usr/bin/awk -f
@include "join"
BEGIN {
   split("#FFFF00", a, "")
   print join(a, 1, length(a), SUBSEP)
}

https://stackoverflow.com/questions/16529716#16529730

Answer 5

Here's a solution that doesn't rely on gawk or knowing the length of the array and lets you put a separator (space in this case) string between each array element if you like:

color = "#FFFF00"
printf "color original: %s\n", color
split(color, chars, "")
joined = sep = ""
for (i=1; i in chars; i++) {
    joined = joined sep chars[i]
    sep = " "     # populate sep here with whatever string you want between elements
}
printf "color joined: %s\n", joined

I also cleaned up the incorrect use of printf and the spurious semi-colons.