How to rename with prefix/suffix?

You could use the rename(1) command:

rename 's/(.*)$/new.$1/' original.filename

Edit: If rename isn’t available and you have to rename more than one file, shell scripting can really be short and simple for this. For example, to rename all *.jpg to prefix_*.jpg in the current directory:

for filename in *.jpg; do mv "$filename" "prefix_${filename}"; done;

or also, leveraging from Dave Webb’s answer and using brace expansion:

for filename in *.jpg; do mv {,prefix_}"$filename"; done;

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