CODEWITHSUNDEEP
shellunixawksed
Rohith
Rohith

Reputation: 1167

Formatting a string in Unix

$ landscape=aws,azure
$ echo $landscape

expected o/p: 

aws-landscape,azure-landscape

How I am doing it now..!?

$ landscape=aws,azure
$ GITLANDSCAPE=$(echo $Landscapes | sed 's/,/-landscape,/g' | sed 's/$/-landscape/g')
$ echo $GITLANDSCAPE

Is there a better way to do it?

Upvotes: 1

Views: 1326

Answers (4)

Shen Yudong
Shen Yudong

Reputation: 1230

with sed, you can do as this:

echo $landscape | sed -E 's/,|$/-landscape&/g'
aws-landscape,azure-landscape

or, you can do with awk:

echo $landscape | awk -F, '{print $1"-landscape,"$2"-landscape"}'
aws-landscape,azure-landscape

Upvotes: 2

tripleee
tripleee

Reputation: 189357

Using a comma to delimit your strings is probably the main pain point here. The shell naturally supports space-separated tokens.

printf '%s-landscape\n' aws azure

If you want to do something a bit more complex, maybe a loop.

sep=''
for token in aws azure; do
    printf '%s%s-landscape' "$sep" "$token"
    sep=','
done

If you want to do something even more complex, perhaps put them in an array. (This is not Bourne/POSIX sh compatible, but a common extension in Ksh, Bash, etc.)

a=(aws azure)
for token in "${a[@]}"; do ...

As an aside, in Bash, there is also brace expansion:

printf '%s\n' {aws,azure}-landscape

This is tortured, but produces what you are asking:

printf '%s' {aws,\,azure}-landscape

The first comma separates the phrases between the braces. To include a literal comma in one of the phrases, we backslash it.

Upvotes: 2

user1934428
user1934428

Reputation: 22225

If I understand you right, you have a variable holding a comma-separated list of words. You want to add a fixed string, -landscape, to each of these words, keeping the comma as separator.

This is one way to do it, provided that none of the words contains white space:

words1=ab,cd,ef,gh
words2=$(printf %s $words1 | xargs --delimiter , -L 1 printf "%s-landscape " | fmt -1 | paste -d, -s)
echo $words2

This would print

ab-landscape,cd-landscape,ef-landscape,gh-landscape

How it works: The xargs tears apart the words1 string into individual words and invokes printf to add -landscape to each. The resulting output is still separated by spaces, not by comma. With fmt, these words are put in separate lines, one line for each word. The final paste joins these lines with a comma.

Upvotes: 0

fancyPants
fancyPants

Reputation: 51868

Replacing the comma is not a particularly good style.

You can do it like this:

landscape=aws,azure
echo $landscape | awk 'BEGIN{FS=",";OFS=",";suffix="-landscape"}{print $1suffix,$2suffix}'

Output:

aws-landscape,azure-landscape

In the BEGIN block you set the following variables:

  • FS: field separator
  • OFS: output field separator
  • suffix: you can use a variable here, in case you want to change the text later and don't want to change the text on several places in the code

Upvotes: 4

Related Questions