Unix 如何将周期性换行插入到一个有一行非常长的文件中

我有一个文本文件，只有一行，但2G字符

我需要在文件中查找一些内容，但行太长，无法在任何编辑器中打开-无论是在Unix上，还是如果我将其ftp到PC上

是否有一种快速/简单的方法插入换行符，例如每120个字符插入一行

sed 's/\(.\{120\}\)/\1\n/g' file.txt

如果需要创建新文件，则只需重定向输出：

sed 's/\(.\{120\}\)/\1\n/g' file.txt > new_file.txt

下面是一个示例，每行显示4个字符

[fotanus@thing ~]$ cat test.txt 
qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq
[fotanus@thing ~]$ sed 's/\(.\{4\}\)/\1\n/g' test.txt > a.txt
[fotanus@thing ~]$ cat a.txt 
qqqq
qqqq
qqqq
qqqq
qqqq
qqqq
qqqq
qqqq
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qqqq

如果需要创建新文件，则只需重定向输出：

sed 's/\(.\{120\}\)/\1\n/g' file.txt > new_file.txt

下面是一个示例，每行显示4个字符

[fotanus@thing ~]$ cat test.txt 
qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq
[fotanus@thing ~]$ sed 's/\(.\{4\}\)/\1\n/g' test.txt > a.txt
[fotanus@thing ~]$ cat a.txt 
qqqq
qqqq
qqqq
qqqq
qqqq
qqqq
qqqq
qqqq
qqqq
qqqq
qqqq
qqqq
qqqq
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你可以试试这句话：

 sed -r 's/.{120}/&\n/g' file

如果要将更改写回原始文件：

sed -ir 's/.{120}/&\n/g' file

例如：

文件有100个

s

，每12个字符添加一个换行符：

kent$  cat file                   
ssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssss


kent$  sed -r 's/.{12}/&\n/g' file
ssssssssssss
ssssssssssss
ssssssssssss
ssssssssssss
ssssssssssss
ssssssssssss
ssssssssssss
ssssssssssss
ssss

你可以试试这句话：

 sed -r 's/.{120}/&\n/g' file

如果要将更改写回原始文件：

sed -ir 's/.{120}/&\n/g' file

例如：

文件有100个

s

，每12个字符添加一个换行符：

kent$  cat file                   
ssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssss


kent$  sed -r 's/.{12}/&\n/g' file
ssssssssssss
ssssssssssss
ssssssssssss
ssssssssssss
ssssssssssss
ssssssssssss
ssssssssssss
ssssssssssss
ssss

---

Fold

命令就是这样做的，所以如果您想在120后换行

fold -w120 fie > newfile

---

Fold

命令就是这样做的，所以如果您想在120后换行

fold -w120 fie > newfile

---

如果您不介意创建另一个文件。在

linux

上用

bash

测试了这一点。这里blah.out是输入文件

while read -r -d '' -n 120 record; do echo $record; done<blah.out > blah2.out

读取时-r-d'-n120记录；不要重复记录；说完了

如果您不介意创建另一个文件。在

linux

上用

bash

测试了这一点。这里blah.out是输入文件

while read -r -d '' -n 120 record; do echo $record; done<blah.out > blah2.out

读取时-r-d'-n120记录；不要重复记录；说完了

使用哪种程序语言？这与编程有关吗？您是否尝试过使用

less

。根据我的经验，它在处理大文件方面做得很好。@Colin-less将为我在屏幕上显示它，并将行包装十亿次。但是，如果我将less的输出管道化到一个文件中，结果文件仍然只有一行。这是一个很接近的结果，但我认为文本处理可能与主题有关（尽管这是一个更好的选择）。我的意思是，有多少非程序员需要做这类事情……顺便说一句，unix.SE上有一个副本：使用哪种程序语言？这与编程有关吗？您是否尝试过使用

less

。根据我的经验，它在处理大文件方面做得很好。@Colin-less将为我在屏幕上显示它，并将行包装十亿次。但是，如果我将less的输出管道化到一个文件中，结果文件仍然只有一行。这是一个很接近的结果，但我认为文本处理可能与主题有关（尽管这是一个更好的选择）。我的意思是，有多少非程序员需要做这种事情…顺便说一句，unix上有一个副本。SE:它正在运行。。。祈祷吧。请接受@vidit的回答，我相信这是最好的方式。它不起作用。new_file.txt也是一个巨大的line@Marjeta有意思，也许重定向不起作用？在终端输出中工作。无论如何，

fold

是这个工作的正确工具，而不是

sed

为什么不重定向工作？是的，折叠工作-谢谢你告诉我正确的答案。它正在运行。。。祈祷吧。请接受@vidit的回答，我相信这是最好的方式。它不起作用。new_file.txt也是一个巨大的line@Marjeta有意思，也许重定向不起作用？在终端输出中工作。无论如何，

fold

是这个工作的正确工具，而不是

sed

为什么不重定向工作？是的，折叠工作-谢谢你告诉我正确的答案。事实上，我不想覆盖原始文件。啊！sed:非法选项--r用法：sed[-n]脚本[文件…]sed[-n][-e脚本]。。。[-f脚本文件]。。。[文件…]实际上，我不想覆盖原始文件。啊！sed:非法选项--r用法：sed[-n]脚本[文件…]sed[-n][-e脚本]。。。[-f脚本文件]。。。[文件…]这个有效。谢谢这个有效。谢谢