How do I split a String in CSH?

Question

For example, I want to split "one,two,three" with comma as delimiter and use a loop to process the resulted three substring separately.

Leatri

Answer 1

For example:

set s = "one,two,three"
set words = `echo $s:q | sed 's/,/ /g'`
foreach word ($words:q)
    echo $word:q
end

But consider whether csh is the right tool for whatever job you're doing:

http://www.bmsc.washington.edu/people/merritt/text/cshbad.txt

Peccary

Thanks. What does :q mean here? – Leatri

It quotes the variable; $s:q is similar to "$s". It's not needed for this example, but it might be in other cases (say, where you have whitespace in the data). – Peccary

Answer 2

A simpler solution than the current one presented involves using the built-in substitution modifer -- there is no need or reason to wastefully use a loop or external command substitution in this instance:

set list = one,two,three
set split = ($list:as/,/ /)

echo $split[2] # returns two

() creates a list, the :s is the substitution modifier and :as repeats the subtitution as many times as needed.

Furthermore, t/csh does not require quoting of bare strings, nor variables that do not require forced evaluation.

Deeply

What if list = "one,two or three,four"? How do you get: "two or three"? – Precautionary

Maybe then: echo "$list" | awk -F',' '{print $2}' is better... – Precautionary

Answer 3

set list = one,two,three
foreach i ( $list:as/,/ / )
  echo $i
end

Hellbent

Can you explain wt is function – Smother