optipng: Error: Can’t back up the existing output file

1.0 Error While running optipng on a png file, the following error was obtained, Error: Can’t back up the existing output file 2.0 Solution The file was not having the write permission. Once, the write mode bit for the file was set, optipng worked fine. $ ls -ls abc.png 84 -r–r–r– 1 alice dev 82981 …

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