我想解析一些输出,因此我排除包含foo
or的所有行bar
,以及紧邻这些行之前的所有行。例如:
echo "
1 some line
2 line to exclude because the next line has one of the terms
3 line with foo
4 line to exclude because the next line has one of the terms too
5 line with bar
6 another line
">InputFile
我想要输出:
1 some line
6 another line
我尝试过cat InputFile|grep -v "foo"|grep -v "bar"
,但它不排除第2行和第4行,并且-B1
之前行的选项也不起作用。
答案1
也许awk
?
awk 'BEGIN{a = "foo"}; a !~ /foo|bar/ && $0 !~ /foo|bar/{print a};
{a = $0};END{if(a !~ /foo|bar/){print a}}' InputFile
答案2
尝试这个 :
grep -v "$(grep -E -B1 "foo|bar" InputFile)" InputFile
答案3
这是本质上相同的事情的更详细版本@1_CR贴在上面,@ash 显示在帕斯特宾,希望使用更易读的语法:
awk '{
lastLine = currentLine;
currentLine = $0;
}
/foo|bar/ \
{
getline currentLine
next
}
NR > 1 \
{
print lastLine;
}
END \
{
if ( currentLine !~ /foo|bar/ )
print currentLine;
}
' InputFile