[英]“sed” command in bash
Could someone explain this command for me: 有人可以为我解释这个命令:
cat | sed -e 's,%,$,g' | sudo tee /etc/init.d/dropbox << EOF
echo "Hello World"
EOF
What does the "sed" command do? “sed”命令有什么作用?
sed
is the Stream EDitor . sed
是Stream EDitor 。 It can do a whole pile of really cool things , but the most common is text replacement. 它可以做很多很酷的事情 ,但最常见的是文本替换。
The s,%,$,g
part of the command line is the sed
command to execute. 命令行的
s,%,$,g
部分是要执行的sed
命令。 The s
stands for substitute, the ,
characters are delimiters (other characters can be used; /
, :
and @
are popular). 该
s
代表替代,所述,
字符是定界符(其它字符可用于; /
, :
和@
是流行)。 The %
is the pattern to match (here a literal percent sign) and the $
is the second pattern to match (here a literal dollar sign). %
是要匹配的模式(这里是文字百分号),而$
是要匹配的第二个模式(这里是文字美元符号)。 The g
at the end means to g
lobally replace on each line (otherwise it would only update the first match). 所述
g
在结束手段g
lobally每行(否则将只更新第一匹配)取代。
Here sed
is replacing all occurrences of %
with $
in its standard input. 这里
sed
用标准输入中的$
替换所有出现的%
。
As an example 举个例子
$ echo 'foo%bar%' | sed -e 's,%,$,g'
will produce "foo$bar$". 将产生“foo $ bar $”。
它读取Hello World
( cat
),用$
替换所有( g
) %
的出现,并且(over)以root身份将其写入/etc/init.d/dropbox
。
sed is a stream editor. sed是一个流编辑器。 I would say try man sed.If you didn't find this man page in your system refer this URL:
我会说尝试man sed。如果你没有在你的系统中找到这个手册页,请参考以下URL:
http://unixhelp.ed.ac.uk/CGI/man-cgi?sed http://unixhelp.ed.ac.uk/CGI/man-cgi?sed
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