linux - `for f in *; do cp "$f" "$f"_copy; done` doesn't work because "foo.png_copy". How to fix it? -


on linux, command:

for f in *; cp "$f" "$f"_copy; done

doesn't work expected because "_copy" string appended after file extension, becoming foo.png_copy instead of foo_copy.png. how fix it? can slice string?

for f in *;     prefix="${f%.*}"     suffix="${f:${#prefix}}"     cp "$f" "${prefix}_copy${suffix}" done

this finds filename's prefix trimming suffix matching ".*". note if filename doesn't have extension, entire filename; if has more 1 period, it'll remove last 1 (e.g. file named "this.that.etc.png", it'll trimmed "this.that.etc"). finds suffix slicing filename based on length of prefix (${#prefix}); works expected whether or not removed.

warning: treat filename period in has having extension. example, "file_v1.0" copied "file_v1_copy.0".

note: if wanted, skip defining $suffix, , use ${f:${#prefix}} inline in copy command, think clearer.


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