Please tell me how to display the line before the line found by findstr. - China DOS Union Forum

The line before does not include the character to be found. How to display the line before the line found by findstr?

set ACCOUNT=1234
set DATE=20170302
set DIR=d:\log\
for %%i in (%DATE%) do findstr /nisd:%DIR% "%ACCOUNT%" %%i.log >>log.txt

The line in the log that includes the account number has no time, and the previous line has time, but the previous line does not have the account number. We cannot display all the lines with time because there are logs of other accounts.

Under Linux, awk can be used to achieve: awk '/1234/{print a"\n"$1;}{a=$0}' 20170302.log

[ Last edited by wiq on 2017-3-3 at 09:20 ]

Floor1　wiq	Posted 2017-03-02 16:22
初级用户　Posts 35　Credits 179
The line before does not include the character to be found. How to display the line before the line found by findstr? set ACCOUNT=1234 set DATE=20170302 set DIR=d:\log\ for %%i in (%DATE%) do findstr /nisd:%DIR% "%ACCOUNT%" %%i.log >>log.txt The line in the log that includes the account number has no time, and the previous line has time, but the previous line does not have the account number. We cannot display all the lines with time because there are logs of other accounts. Under Linux, awk can be used to achieve: awk '/1234/{print a"\n"$1;}{a=$0}' 20170302.log [ Last edited by wiq on 2017-3-3 at 09:20 ]