bash 如何在不以非交互方式覆盖的情况下进行 gunzip
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How to gunzip without overwriting non-interactively
提问by herder
I want to unzip .gzfiles but without overwriting. When the resulting file exists, gunzip will ask for permission to overwrite, but I want gunzip not to overwrite by default and just abort. I read in a man that -fforce overwriting, but I haven't found nothing about skipping it.
我想解压缩.gz文件但不覆盖。当生成的文件存在时，gunzip 将要求覆盖权限，但我希望 gunzip 默认不覆盖并中止。我读过一个-f强制覆盖的人，但我没有发现跳过它。
gunzip ${file}
I need something like -nin copying cp -n ${file}
我需要像-n复制一样的东西cp -n ${file}
回答by dogbane
gunzipwill prompt you before overwriting a file. You can use the yescommand to automatically send an nstring to the gunzipprompt, as shown below:
gunzip将在覆盖文件之前提示您。可以使用该yes命令自动向提示发送n字符串gunzip，如下图：
$ yes n | gunzip file*.gz
gunzip: file already exists; not overwritten
gunzip: file2 already exists; not overwritten
回答by konsolebox
Granting your files have .gzextensions, you can check if the file exists before running gunzip:
授予您的文件.gz扩展名，您可以在运行之前检查文件是否存在gunzip：
[[ -e ${file%.gz} ]] || gunzip "${file}"
[[ -e ${file%.gz}]] removes .gzand checks if a file having its name exists. If not (false), ||would run gunzip "${file}".
[[ -e ${file%.gz}]] 删除.gz并检查具有其名称的文件是否存在。如果不是 (false)，||将运行gunzip "${file}".
回答by crizCraig
Here's a combination of the answers here and thisthat will unzip a group of gzipped files to a different destination directory:
这里是这里的答案的组合和这将解压缩一组gzip压缩的文件到不同的目的地目录：
dest="unzipped"
for f in *.gz; do
STEM=$(basename "${f}" .gz)
unzipped_name="$dest/$STEM"
echo ''
echo gunzipping $unzipped_name
if [[ -e $unzipped_name ]]; then
echo file exists
else
gunzip -c "${f}" > $unzipped_name
echo done
fi
done
