I have a file with lines like
我有一个像行的文件
something
-----------
where there's a leading and trailing space after something. I want to replace it with
什么东西之后有一个领先和尾随的空间。我想用它替换它
other
-------
and preserve the leading and trailing space. How?
并保留领先和尾随空间。怎么样？
3 个解决方案
#1
1
This might work for you (GNU sed):
这可能适合你（GNU sed）：
sed -i '/^ something $/{:a;N;/^--*$/M!ba;s/something/other/}' file
Gather up lines between the start and end markers, then replace the required string with the alternative.
收集开始和结束标记之间的行，然后用替代标记替换所需的字符串。
N.B. Uses the M flag to make an exact match within multiple lines.
注：使用M标志在多行中进行精确匹配。
#2
1
sed is for simple substitutions on individual lines, that is all, for anything else you should be using awk:
sed用于单独行的简单替换，也就是说，除了你应该使用awk的任何其他内容：
$ awk 'n{$0=substr($0,1,n); n=0} {sub(/^ something $/," other "); n=length()}1' file
other
-------
That will work with any awk in any shell on any UNIX box.
这适用于任何UNIX机器上任何shell中的任何awk。
#3
0
sed can match multiple lines with a comma separated set of regexps. And substitute everything in the range with the c command. To get the c command not to ignore leading white space, use a backslash after it. e.g.
sed可以使用逗号分隔的正则表达式匹配多行。并使用c命令替换范围内的所有内容。要使c命令不忽略前导空格，请在其后使用反斜杠。例如
sed -i.original '/^ something $/,/-----------$/c\ other \n-------' input-filename
#1
1
This might work for you (GNU sed):
这可能适合你（GNU sed）：
sed -i '/^ something $/{:a;N;/^--*$/M!ba;s/something/other/}' file
Gather up lines between the start and end markers, then replace the required string with the alternative.
收集开始和结束标记之间的行，然后用替代标记替换所需的字符串。
N.B. Uses the M flag to make an exact match within multiple lines.
注：使用M标志在多行中进行精确匹配。
#2
1
sed is for simple substitutions on individual lines, that is all, for anything else you should be using awk:
sed用于单独行的简单替换，也就是说，除了你应该使用awk的任何其他内容：
$ awk 'n{$0=substr($0,1,n); n=0} {sub(/^ something $/," other "); n=length()}1' file
other
-------
That will work with any awk in any shell on any UNIX box.
这适用于任何UNIX机器上任何shell中的任何awk。
#3
0
sed can match multiple lines with a comma separated set of regexps. And substitute everything in the range with the c command. To get the c command not to ignore leading white space, use a backslash after it. e.g.
sed可以使用逗号分隔的正则表达式匹配多行。并使用c命令替换范围内的所有内容。要使c命令不忽略前导空格，请在其后使用反斜杠。例如
sed -i.original '/^ something $/,/-----------$/c\ other \n-------' input-filename