Linux bash 中的“sed”命令
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"sed" command in bash
提问by ajsie
Could someone explain this command for me:
有人可以为我解释这个命令：
cat | sed -e 's,%,$,g' | sudo tee /etc/init.d/dropbox << EOF
echo "Hello World"
EOF
What does the "sed" command do?
“sed”命令有什么作用？
采纳答案by Hyman Kelly
sedis the Stream EDitor. It can do a whole pile of really cool things, but the most common is text replacement.
sed是流编辑器。它可以做一大堆非常酷的事情，但最常见的是文本替换。
The s,%,$,gpart of the command line is the sedcommand to execute. The sstands for substitute, the ,characters are delimiters (other characters can be used; /, :and @are popular). The %is the pattern to match (here a literal percent sign) and the $is the second pattern to match (here a literal dollar sign). The gat the end means to globally replace on each line (otherwise it would only update the first match).
s,%,$,g命令行的部分是sed要执行的命令。的s代表的替代品，所述,字符是定界符（其他字符均可使用; /，:和@是流行）。该%是要匹配的模式（这里是文字百分号），并且$是第二个模式匹配（此处文字美元符号）。所述g在末端手段globally取代在每行上（否则将只更新第一匹配）。
回答by Lekensteyn
It reads Hello World(cat), replaces all (g) occurrences of %by $and (over)writes it to /etc/init.d/dropboxas root.
它读取Hello World( cat)，替换所有 ( g) 出现的%by$并（覆盖）以/etc/init.d/dropboxroot 身份将其写入。
回答by codaddict
Here sedis replacing all occurrences of %with $in its standard input.
这sed是在其标准输入中替换所有出现的%with $。
As an example
举个例子
$ echo 'foo%bar%' | sed -e 's,%,$,g'
will produce "foo$bar$".
将产生“foo$bar$”。
回答by Anil Vishnoi
sed is a stream editor. I would say try man sed.If you didn't find this man page in your system refer this URL:
sed 是一个流编辑器。我想说试试 man sed。如果你在你的系统中没有找到这个手册页，请参考这个 URL：
