Check a small note in the log:
grep -F "[20210115023500][3, 4]" /home/work/a.txt
Without -F, it will be matched according to regular
Add -F to match only by string
Check a small note in the log:
grep -F "[20210115023500][3, 4]" /home/work/a.txt
Without -F, it will be matched according to regular
Add -F to match only by string