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Gowtham
Gowtham

Reputation: 1

How to loop comma separated values in shell script

I tried to loop comma separated values with space, but not able to get the exact value since it has space in the string.

I tried in different ways, but i not able to get desired results. Can anyone help me on this

#!/bin/ksh

values="('A','sample text','Mark')"

for i in `echo $values | sed 's/[)(]//g' | sed 's/,/ /g'`
do
  echo $i
done

My expected output is:

A
sample text
Mark

Upvotes: 0

Views: 4823

Answers (4)

Walter A
Walter A

Reputation: 20002

You should use the single quotes for splitting the string (and quote "$values").
When your sed supports \n for replacement into a line, you can do without a loop:

echo "${values}" | sed "s/[)(]//g;s/','/\n/g;s/'//g"
# or
sed "s/[)(]//g;s/','/\n/g;s/'//g" <<< "${values}"

When the values in your string are without a comma and parentheses, you can use

grep -Eo "[^',()]*" <<< "${values}"

Better is looking for fields between 2 single quotes and remove those single quotes.

grep -Eo "'[^']*'" <<< "${values}" | tr -d "'"

Upvotes: 0

Akhil
Akhil

Reputation: 1040

Simply trim the quotes

#!/bin/ksh

values="('A','sample text','Mark')"
echo $values |  tr  -d "()'\"" | tr ',' '\n'

output:

A
sample text
Mark

Upvotes: 0

agc
agc

Reputation: 8406

This is the same as Chepner's answer, only kludgier, (variable substitution), and more dangerous, (the eval...), the better to use the OP's exact $values assignment:

values="('A','sample text','Mark')"
eval values=${values//,/ }
for i in "${values[@]}"; do
  echo "$i"
done

It works in ksh, but really, if at all possible try to use Chepner's simpler and safer $values assignment.

Upvotes: 0

chepner
chepner

Reputation: 531075

First, change values to an array. Then iterating over it is a simple matter.

values=(A "sample text" Mark)
for i in "${values[@]}"; do
  echo "$i"
done

Upvotes: 2

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