我如何删除匹配的行和前一行? [英] How do I delete a matching line and the previous one?
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问题描述
我需要删除一条匹配的行和之前的一行。
例如在下面的文件中,我需要删除行1& 2。
I need delete a matching line and one previous to it. e.g In file below I need to remove lines 1 & 2.
我试过了grep -v -B 1页面。。1.txt
,不打印matchning行和上下文。
I tried "grep -v -B 1 "page.of." 1.txt and I expected it to not print the matchning lines and the context.
我试过了如何使用sed删除匹配的行,上面的行和下面的行? ,但无法理解sed的用法。
I tried the How do I delete a matching line, the line above and the one below it, using sed? but could not understand the sed usage.
---1.txt--
**document 1** -> 1
**page 1 of 2** -> 2
testoing
testing
super crap blah
**document 1**
**page 2 of 2**
推荐答案
你想做一些非常类似于给出的答案
You want to do something very similar to the answer given
sed -n '
/page . of ./ { #when pattern matches
n #read the next line into the pattern space
x #exchange the pattern and hold space
d #skip the current contents of the pattern space (previous line)
}
x #for each line, exchange the pattern and hold space
1d #skip the first line
p #and print the contents of pattern space (previous line)
$ { #on the last line
x #exchange pattern and hold, pattern now contains last line read
p #and print that
}'
并作为单行
sed -n '/page . of ./{n;x;d;};x;1d;p;${x;p;}' 1.txt
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