bash - 无法制作一系列虚拟文件

Question

我需要将文件从 File1、File2、... 调用到 File99。

我尝试了以下失败

cat test > {File1 .. File99}

没有 File 字样的命令不起作用。

Answer 1

$ for i in {1..100}; do touch "File$i"; done 

Answer 2

只有一个命令：

touch File{1..99}

Answer 3

这取决于您使用的外壳。我假设您正在使用 Bash。

根据http://www.gnu.org/software/bash/manual/bashref.html#Brace-Expansion，Bash 将扩展数字和单个字符。所以你的大括号表达式应该是：

File{1..99}

但我不认为重定向运算符“>”可以输出到多个文件。您可能需要使用循环：

for output in File{1..99}
do
    cat test > $output
done

或作为单行：

for output in File{1..99}; do cat test > $output; done

Answer 4

如果您更喜欢非循环版本，那么您可以使用 tee

cat test | tee File{1..99} > /dev/null

Answer 5

使用zsh（及其mult_ios），您可以:)

% zsh -c 'print test > file{1..3}' 
% head file*                      
==> file1 <==
test

==> file2 <==
test

==> file3 <==
test

Answer 6

If you want the files to sort properly (file01, file02 ... file10, etc.), do this:

for i in {0..10}; do i="0"$i; touch file${i: -2}; done

Which is the same as:

for i in {0..10}
do
    i="0"$i
    touch file${i: -2} # or cat file > file${i: -2}
done

There must be be a space between the colon and the dash in the substring expansion clause. You can start the ranges above with 1 if you want to start with "file01".

Or, a much more succinct way to have leading zeros:

touch file{0..9}{0..9}

and to use phyrex1an's technique with this one:

cat test | tee File{0..9}{0..9} > /dev/null

This does make one extra file "file00". You can also do "{2..3}{0..9}" for "file20" through "file39", but changing the ones digit (the second range) would cause parts of the sequence to be skipped.