How to add a specific character after every one character

text processing

I have a number -> 12345

I want output in below format

1+2+3+4+5

echo `cat fl.txt | paste -s -d ''`

gives only 12345.

But when I add this + at the below command it gives same 12345.

echo `cat fl.txt | paste -s -d '' | tr -s '' '+'`

Best Answer

With GNU sed, you can also do:

sed 's/./+&/2g'

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text-processing sed – Write a sed One-Liner to Add Character After Every Third Character

Since you don't want a trailing +, you could do:

fold -w3 | paste -sd+ -

That is, fold the lines on 3 character width, and paste those 3 character lines with themselves with + as the delimiter which in effect is like changing every newline character but the last one into a +. If the input had more than one line, you'll end up with those lines joined with a + which may or may not be what you want.

If you do need it to be sed, you can remove the trailing + after:

sed 's/.../&+/g;s/+$//'

Best Answer

Related Solutions

text-processing sed – Write a sed One-Liner to Add Character After Every Third Character

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