Cut sub-string and rename files use shell command

Question

How to rename file names? I want to map names:

abc-hdpi.png ⟶ abc.png
bcd-hdpi.png ⟶ bcd.png

...

I have many files to do this, so mv abc-hdpi.png abc.png is not a good solution.

What is it that you want to remove, more specifically? Are all files named `*-hdpi.png`, or do you want to remove everything after a dash? — Dolda2000, Mar 17 '15 at 03:28
Yes, all files named `*-hdpi.png`, and I want to discard `-hdpi`, and rename to `*.png`. Thanks. — Weiyi, Mar 17 '15 at 03:33

score 6 · Accepted Answer · answered Mar 17 '15 at 03:30

6

Search for prename (Perl rename) command; it can do the job easily:

prename 's/-hdpi.png/.png/' *-hdpi.png

Failing that:

for file in *-hdpi.png
do
    mv "$file" "${file%-hdpi.png}.png"
done

answered Mar 17 '15 at 03:30

Jonathan Leffler

730,956
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Yeah, that's better. – Michael Mar 17 '15 at 03:31
`prename` not work, terminal tells `substitution replacement not terminated at (eval 1) line 1` – Weiyi Mar 17 '15 at 03:52
`for do done` works, thanks : ) – Weiyi Mar 17 '15 at 04:00
I'm puzzled about `prename` not working if you have it on the machine. You did include the single quotes, didn't you? I'm glad that the `for` loop worked as a fallback. – Jonathan Leffler Mar 17 '15 at 04:02

score 1 · Answer 2 · edited Oct 29 '19 at 14:14

1

You can extract from a fixed length string like so:

NAME[0]="abc-hdpi.png"
NAME[1]="def-hdpi.png"
NAME[2]="ghi-hdpi.png"
NAME[3]="jkl-hdpi.png"
NAME[4]="mno-hdpi.png"

rename(){
    var=$1
    mv $var $var{0:2}$var{8:}
}

for i in "${Name[@]}"
do
    rename $i
done

edited Oct 29 '19 at 14:14

simhumileco

31,877
16
137
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answered Mar 17 '15 at 03:33

Ganesh Kamath - 'Code Frenzy'

5,094
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The `$var = $1` does not work; no spaces around `=` in shell assignments, and no `$` before the name on the LHS of the assignment. Can't you use a loop to iterate over the array? – Jonathan Leffler Mar 17 '15 at 03:34
thanks, changed $var to var – Ganesh Kamath - 'Code Frenzy' Mar 17 '15 at 03:34
FYI, you could initialize the array with: `NAME=("abc-hdpi.png" "def-hdpi.png" "ghi-hdpi.png" "jkl-hdpi.png" "mno-hdpi.png")`. – Jonathan Leffler Mar 17 '15 at 04:03
I'm very sorry for ambiguous description, the prefix is not fixed length. so your answer may not suitable for this case. Thanks a lot for your immediately answer. :) – Weiyi Mar 17 '15 at 04:07

Cut sub-string and rename files use shell command

2 Answers2