I am trying to extract the value of a, b and c from the given bash string:
x='a: 7 b: 2 c: 7'
But I am not able to find a simpler way yet, tried to convert the string to array, but that works on the assumption that a, b and c are in sequence.
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1What have you tried? "not able to find a simpler way" … simpler than what exactly?knittl– knittl2021-05-06 16:48:28 +00:00Commented May 6, 2021 at 16:48
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1Please add your desired output (no description, no images, no links) for that sample input to your question (no comment).Cyrus– Cyrus2021-05-06 16:58:50 +00:00Commented May 6, 2021 at 16:58
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Sorry for not adding what i tried , i tried below: array_x=($x) a="${array_x[1]}" b="${array_x[3]}" c="${array_x[5]}"Kamal Singhal– Kamal Singhal2021-05-06 17:16:37 +00:00Commented May 6, 2021 at 17:16
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I need to extract keys as 3 more bash variable and assign the given value to them so it becomes a=7; b=2 and c=7Kamal Singhal– Kamal Singhal2021-05-06 17:31:38 +00:00Commented May 6, 2021 at 17:31
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2 Answers
Does the key always come before a colon and comprises only non-blank characters? If so, what prevents you from running grep with the --only-matching option? Clean up the output with cut (or tr -d or sed)
echo "$x" | grep -o '[^ ]*:' | cut -d: -f1
Or, if you want the values (not the keys) – which is not clear from the question – you could split on the double-space (assuming the format is always exactly like that).
echo "$x" | sed 's/ /\n/g' | cut -d: -f2- | cut -c2-
1 Comment
Kamal Singhal
I need to extract keys as 3 more bash variable and assign the given value to them
You can use parameter expansion.
#!/bin/bash
x='a: 7 b: 2 c: 7'
x=" $x"
for key in a b c ; do
value=${x#* $key: } # Remove everything before " k: " where k is the key
value=${value%% *} # Remove everything after the first space
echo Value of "$key" is "$value"
done
3 Comments
Kamal Singhal
this breaks if i change the sequence of a, b and c. x='a: 7 c: 2 b: 7' , I dont know what sequence it would be. but yes those keys will exists in the string
choroba
@KamalSinghal: What do you mean by "breaks"? I'm still getting the correct values. Do you mean you want to get the keys in the same order, too?
Kamal Singhal
No, my bad... i again rechecked it and getting the right value, so This works as expected. Thank you!!!