Searches MediaWiki exception.log(.gz) files for a specific exception string and prints the exception including stack trace.

exgrep

#!/usr/bin/bash

if [[ "$1" == "" ]] || [[ "$2" == "" ]] || [[ "$1" == "--help" ]]; then
        echo "Usage: $0 [-f] exception-log-file needle"
        echo
        echo "Searches exception.log(.gz) files for a specific exception string and prints the exception including stack trace."
        echo "Use -f to follow newly added lines (like tail -f). Needle is case-sensitive."
        exit
fi

cat=cat
if [[ "$1" == "-f" ]]; then
        cat="tail -f"
        shift
fi

file=$1
needle=$2

if [[ "$file" == *.gz ]]; then
        cat=zcat
fi

readOn=0
$cat "$file" | while read -r line; do
        if [[ ! "$line" == 20*-*-*\ *:*:* ]]; then
                if [ $readOn -gt 0 ]; then
                        echo "$line"
                fi
                continue
        fi
        readOn=0
        if [[ "$line" == *"$needle"* ]]; then
                readOn=1
                echo "$line"
        fi
done