logwalk.sh

#!/bin/bash

# logwalk.sh is a log file browser
# Usage: logwalk.sh <logfile>
# input strings you want to filter out
# and then "open" when you want to see the full (filtered) results
# add multiple filters at once by separating them with pipes, e.g. filter1|filter2|etc

GREP=
FILTER=
HEAD=head

while true ; do
    if [ "$FILTER" == "" ]; then
        $HEAD "$1"
    else
        cat "$1" | grep -v -E "$FILTER" | $HEAD
    fi
    echo " --- (o)pen, (e)xit, (h)ead, (t)ail, or string to filter: --- "
    read STRING
    if [ "$STRING" == "e" -o "$STRING" == "exit" ]; then
        exit 0
    fi
    if [ "$STRING" == "o" -o "$STRING" == "open" ]; then
        echo Opening with filtering string: \"$FILTER\"
        cat "$1" | grep -v -E "$FILTER" | less
        continue
    fi
    if [ "$STRING" == "h" -o "$STRING" == "head" ]; then
        HEAD=head
        continue
    fi
    if [ "$STRING" == "t" -o "$STRING" == "tail" ]; then
        HEAD=tail
        continue
    fi
    if [ "$STRING" == "" ]; then
        continue
    fi
    if [ "$GREP" == "" ]; then
        GREP=$STRING
    else
        GREP+=("|$STRING")
    fi
    IFS='' FILTER="${GREP[*]}"
done