grep for Error 并打印包含错误上下两个字符串的所有行 [英] grep for Error and print all the lines containing 2 strings above and below Error

问题描述

saaa vcahJJ HKak vk     
Import xxx xXXXXX xxxx
aaaa aaaa  aaaa ffffff
hhhhhh hhhhhh hhh hhh  hhhhhh
Error reading readStatus api
aaa hhhh aaa aaaaa
gggggggg ggggg xxxxxxxxxx
uuuu hhhhhhhh fffffffff
query run ends
qidIdih II v iQE Iqe

我想在包含上述日志的文件中找到 'Error' 字符串，然后打印 2 个字符串 'Import' 和 ' 之间的所有可用信息结束'.如何使用 grep/sed 执行此操作试过 这个但没有得到太多.注意:我不知道前后会有多少行.它可能与我提供的上述样本不同

I want to find the 'Error' string in the file containing above logs and then print all the info available between 2 strings 'Import' and 'ends'. How can I do this using grep/sed Tried this but didn't get much. Note: I dont know how many lines will be before and after. It may vary from above sample I have provided

推荐答案

你可以试试这个 sed

You can try this sed

sed '/^Import/!d;:A;N;/\nImport/{h;s/.*\n//;bA};/ends$/!bA;h;s/\nError//;tB;d;:B;x' infile

说明:

sed '
/^Import/!d                 # if a line start with Import
:A
N                           # get an other line
/\nImport/{h;s/.*\n//;bA}   # if the last line start with Import
                            # keep only this last line and return to A
/ends$/!bA                  # If the last line end with ends
h                           # keep all the lines in the hold space
s/\nError//                 # look for a line which start with Error
tB                          # if find jump to B
d                           # not find, delete all and return to the start
:B
x                           # restore all the lines and print
' infile

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