bash GNU Parallel - 将输出重定向到具有特定名称的文件
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GNU Parallel - redirect output to a file with a specific name
提问by Crista23
In bash I am running GnuPG to decrypt some files and I would like the output to be redirected to a file having the same name, but a different extension. Basically, if my file is named
在 bash 中，我正在运行 GnuPG 来解密一些文件，并且我希望将输出重定向到具有相同名称但具有不同扩展名的文件。基本上，如果我的文件被命名
file1.sc.xz.gpg
the file which comes out after running the GnuPG tool I would like to be stored inside another file called
运行 GnuPG 工具后出现的文件我想存储在另一个名为
file1.sc.xz
I am currently trying
我目前正在尝试
find . -type f | parallel "gpg {} > {}.sc.xz"
but this results in a file called file1.sc.xz.gpg.sc.xz. How can I do this?
但这会生成一个名为 file1.sc.xz.gpg.sc.xz 的文件。我怎样才能做到这一点？
Later edit: I would like to do this inside one single bash command, without knowing the filename in advance.
稍后编辑：我想在一个单独的 bash 命令中执行此操作，而无需事先知道文件名。
回答by Maxim Egorushkin
You can use bash variable expansion to chop off the extension:
您可以使用 bash 变量扩展来切断扩展：
$ f=file1.sc.xz.gpg
$ echo ${f%.*}
file1.sc.xz
E.g.:
例如：
find . -type f | parallel bash -c 'f="{}"; g="${f%.*}"; gpg "$f" > "$g"'
Alternatively, use expansion of parallel:
或者，使用扩展parallel：
find . -type f | parallel 'gpg "{}" > "{.}"'
回答by Ole Tange
If file names are guaranteed not to contain \n:
如果保证文件名不包含\n：
find . -type f | parallel gpg {} '>' {.}
parallel gpg {} '>' {.} ::: *
If file names may contain \n:
如果文件名可能包含\n：
find . -type f -print0 | parallel -0 gpg {} '>' {.}
parallel -0 gpg {} '>' {.} ::: *
Note that opposite shell variables GNU Parallel's substitution strings should not be quoted. This will notcreate the file 12", but instead 12\" (which is wrong):
请注意，不应引用相反的 shell 变量 GNU Parallel 的替换字符串。这不会创建文件 12"，而是 12\"（这是错误的）：
parallel "touch '{}'" ::: '12"'
These will all do the right thing:
这些都将做正确的事情：
parallel touch '{}' ::: '12"'
parallel "touch {}" ::: '12"'
parallel touch {} ::: '12"'
回答by Charles Duffy
find . -type f -print0 | \
xargs -P 0 -n 1 -0 \
bash -s -c 'for f; do g=${f%.*}; gpg "$f" >"$g"; done' _
Right now this processes only one file per shell, but you could trivially modify that by changing the -nvalue.
现在每个 shell 只处理一个文件，但是您可以通过更改-n值来简单地修改它。
