CODEWITHSUNDEEP
bash
Shih-Min Lee
Shih-Min Lee

Reputation: 9700

Parse a comma separated string and save it to a file in bash

Is there a way to parse a variable like this AAA=1,BBB=2,CCC=3 in bash and store it to a file in this format? 

export AAA=1
export BBB=2
export CCC=3

The reason is that I store the environment variables in AWS Parameter Store and when you do aws ssm get-parameters --names xxx --query "Parameters[0].Value" you would get a comma-separated string.

Thanks.

Upvotes: 1

Views: 1633

Answers (4)

David C. Rankin
David C. Rankin

Reputation: 84541

sed can also be used in this case with 2 substitution expressions. The first to add "export " at the beginning and the second to replace each ',' with "\nexport " resulting in the desired output, e.g.

sed 's/^/export /;s/,/\nexport /g'

Example Use/Output

$ echo "AAA=1,BBB=2,CCC=3" | sed 's/^/export /;s/,/\nexport /g'
export AAA=1
export BBB=2
export CCC=3

You can simply redirect to a file to save the results.

awk

You can also do the same thing with awk, just output each comma-separated field preceded by "export ", e.g.

awk -F, '{for (i=1;i<=NF;i++)print "export", $i}'

(same result)

Upvotes: 1

bishop
bishop

Reputation: 39354

export accepts multiple values in bash, so it is sufficient to just replace the comma with a space, and proceed the line with export:

v=$(aws ssm get-parameters --names xxx --query "Parameters[0].Value")
echo "export ${v//,/ }" > file

Upvotes: 2

Brenda J. Butler
Brenda J. Butler

Reputation: 1485

Assuming the shell variable "variable" contains AAA=1,BBB=2,CCC=3, then the following will do what you want:

echo $variable | tr ',' '\n' > filename

The first part echo $variable | will send the contents of $variable to the stdin of the next process.

The next part tr ',' '\n' will run a process that converts commas in the stream running from stdin to stdout into newlines.

The last part > filename will take the stdout from the last part and put it in a file called filename.

Upvotes: 1

Diego Torres Milano
Diego Torres Milano

Reputation: 69198

Using an array:

v=AAA=1,BBB=2,CCC=3
IFS=, a=( $v )
for i in ${a[@]}
do
    echo "export $i"
done > filename

Upvotes: 0

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