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grep -Ei -B 1 -A 1 "crit|err[^u]|warn|fail[^2]|alert|unknown|unable|miss|except|disable|invalid|cannot|denied|broken|exceed|unsafe|unsolicited" /var/log/dmesg grep -Ei -B 1 -A 1 "crit|err[^u]|warn|fail[^2]|alert|unknown|unable|miss|except|disable|invalid|cannot|denied|broken|exceed|unsafe|unsolicited" /var/log/syslog