I am using grep to printout the matching lines from a very large file from which i got hundreds of matches, some of them are not interesting i want to exclude those matching which are not interesting
grep "WARNING" | grep -v "WARNING_HANDLING_THREAD" path # i tried this
When I grep the file for warning I get
0-00:00:33.392 (2127:127:250:02 = 21.278532 Fri Feb 1 10:17:22 2019) <3:0x000a>:[89]:[enter]: cest_handleFreeReq.c:116: [WARNING]: cest_handleFreeReq: sent from DECA ->UCS
0-00:00:38.263 (2189:022:166:06 = 21.891510 Fri Feb 1 10:17:28 2019) <3:0x000a>:[89]:[enter]: cest_handleConfigReq.c:176: [WARNING]: cest_handleConfigReq.c: GroupConfig NOT present.
0-00:00:38.263 (2189:022:167:03 = 21.891510 Fri Feb 1 10:17:28 2019) <3:0x000a>:[89]:[enter]: cest_handleConfigReq.c:194: [WARNING]: cest_handleConfigReq: physicalConfig NOT present.
60 0x6d77 0 0x504ea | 2 18 | 0 0 | 4 12 | 647 | 14685 0 0.0 0 500 500 | 0 | 0 | 38 | ETH_DRV_WARNING_HANDLING_thread 60 0 | 0 0 | 0 0 0 | 0 0 0 0 0 0 ! N/A N/A N/A N/A N/A N/A |ETH_DRV_WARNING_HANDLING_thread
WARNING: List of threads violating the heap & stack limit
I want to exclude the last lines which are not interesting
0-00:00:33.392 (2127:127:250:02 = 21.278532 Fri Feb 1 10:17:22 2019) <3:0x000a>:[89]:[enter]: cest_handleFreeReq.c:116: [WARNING]: cest_handleFreeReq: sent from DECA ->UCS
0-00:00:38.263 (2189:022:166:06 = 21.891510 Fri Feb 1 10:17:28 2019) <3:0x000a>:[89]:[enter]: cest_handleConfigReq.c:176: [WARNING]: cest_handleConfigReq.c: GroupConfig NOT present.
0-00:00:38.263 (2189:022:167:03 = 21.891510 Fri Feb 1 10:17:28 2019) <3:0x000a>:[89]:[enter]: cest_handleConfigReq.c:194: [WARNING]: cest_handleConfigReq: physicalConfig NOT present.
Is there a way to do this using grep find or any other tool?
Thank you
Note that the substring thread is in lower case in the data, but in upper case in your expression.
Instead, use
grep -F 'WARNING' logfile | grep -F -v 'WARNING_HANDLING_thread'
The -F make grep use string comparisons rather than regular expression matching (this is not really related to your current issue, but just a way of showing that we know what type of pattern we're matching with).
Another option would be to make the second grep do case insensitive matching with -i:
grep -F 'WARNING' logfile | grep -Fi -v 'WARNING_HANDLING_THREAD'
In this case though, I would probably match the [WARNING] tag instead:
grep -F '[WARNING]:' logfile
Note that here we need the -F so that grep interprets the pattern as a string and not as a regular expression matching any single character out of the W, A, R, N, I, G set, followed by a :.