How can I remove the last character of the last line of a file? [duplicate]

Question

I have this set of lines in a file:

{info},
{info},
{info},
{info},

and I want the file like this without the last ",":

{info},
{info},
{info},
{info}

How can I do it in bash? Any idea?

Answer 1

You can use sed:

sed '$ s/.$//' your_file

• First $ is to tell sed to match only last line
• s is for "substitute", note the empty string between the two last /s
• .$ is a regex that matches the last character in the file

Note that you can use whatever separator you want instead of /, for example you can rewrite the expression:

sed '$ s-.$--' your_file