CODEWITHSUNDEEP
regexunixsedcommand
UberNate
UberNate

Reputation: 2399

How to double digits using sed command in Unix?

I'm new to the Unix sed command and I would like to know how to double the first digit in a string?

Suppose we have a string "F0o", How do I double the first digit in the string?

I tried echo f0o | sed s/0/00/, giving f00o, but this will only work for 0s. If the string is "f12o" the output should be f112o, simply doubling the first digit in the string.

Is there a command where I can specifically target digits only?

Upvotes: 1

Views: 853

Answers (1)

devnull
devnull

Reputation: 123448

I would like to know how to double the first digit in a string

You could say:

sed 's/[0-9]/&&/' filename

This would print the first digit in a line two times.

$ sed 's/[0-9]/&&/' <<< "f12o"
f112o

Upvotes: 2

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