bash unix 命令行，用于使用 <br> 内联替换文件中的所有换行符\n
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unix commandline for inline replacement of all newlines in file with <br>\n
提问by DrMHC
sed 's/$/<br>/' mytext.txt
worked but output it all on the command line. I want it to just do the replacement WITHIN the specified file itself. Should I be using another tool?
工作但在命令行上输出它。我希望它只是在指定的文件本身内进行替换。我应该使用其他工具吗？
回答by camh
If you have gnu sed, you can use the -ioption, which will do the replacement in place.
如果您有 gnu sed，您可以使用该-i选项，它将在适当的位置进行替换。
sed -i 's/$/<br>/' mytext.txt
Otherwise you will have to redirect to another file and rename it over the old one.
否则，您将不得不重定向到另一个文件并将其重命名为旧文件。
sed 's/$/<br>/' mytext.txt > mytext.txt.new && mv mytext.txt.new mytext.txt
回答by bashfu
Just for completeness. On Mac OS X (which uses FreeBSD sed) you have to use an additional null-string "" for in-place file editing without backup:
只是为了完整性。在 Mac OS X（使用 FreeBSD sed）上，您必须使用额外的空字符串 "" 进行就地文件编辑而无需备份：
sed -i "" 's/$/<br>/' mytext.txt
As an alternative to using sed for no-backup in-place file editing, you may use ed(1), which, however, reads the entire file into memory before operating on it.
作为使用 sed 进行无备份就地文件编辑的替代方法，您可以使用 ed(1)，但是，它会在对其进行操作之前将整个文件读入内存。
printf '%s\n' H 'g/$/s//<br>/g' ',p' | ed -s test.file # print to stdout
printf '%s\n' H 'g/$/s//<br>/g' wq | ed -s test.file # in-place file edit
For more information on ed(1) see:
有关 ed(1) 的更多信息，请参阅：
"Editing files with the ed text editor from scripts",
"使用 ed 文本编辑器从脚本编辑文件",
回答by paxdiablo
If you have an up-to-date sed, just use sed -ior sed --in-place, which will modify the actual file itself.
如果您有最新的sed，只需使用sed -i或sed --in-place，这将修改实际文件本身。
If you want a backup, you need to supply a suffix for it. So sed -i.bakor sed --in-place=.bakwill create a backup file with the .baksuffix.
如果需要备份，则需要为其提供后缀。所以sed -i.bakorsed --in-place=.bak会创建一个带有.bak后缀的备份文件。
Use this! Seriously! You'll appreciate it a lot the first time you damage your file due to a mistyped sedcommand or wrong assumption about the data in the file.
用这个！严重地！当您第一次由于输入错误的sed命令或对文件中数据的错误假设而损坏文件时，您会非常感激。
回答by t0mm13b
Use the redirection symbol i.e.
使用重定向符号即
sed 's/$/<br>/' mytext.txt > mytext2.txt && mv mytext2.txt mytext.txt
