Merge irssi log directories, deleting small files

migration-irssi-logs.sh

#!/bin/bash

# migrate.sh
#   DESCRIPTION:        Parse two directories of logfiles.
#   FUNCTION:           Append new files with old ones, delete files that are small, and move new files that aren't present to the old directory.
#   USAGE:              bash migrate.sh /path/to/old_logdir /path/to/new_logdir
#   ELABORATION:

# Settings
minlines=15             # Threshhold number of lines to delete a logfile

# Configure directories to compare against and process to.
if [ $# -le 1 ] ; then
        echo "Usage: $0 /path/to/old_logdir /path/to/new_logdir"
        exit 1
else
        ologdir=$1
        nlogdir=$2
fi

# Iterate logfiles
p=0
m=0
a=0
d=0
for file in ${nlogdir}/*/*.log ; do
        p=(( $c + 1 ))
        wc=($(wc -l $file))
        # If file is less than MINLINES, delete it.
        if [ ${wc[0]} -lt $minlines ] ; then
                d=(( $d + 1 ))
                echo "Deleting $file as it is less than $minlines lines..."
                rm $file
        else
                # If file exists in OLD_LOG_DIR, concatenate new logfile to old.
                if [ -s ${ologdir}/${file} ] ; then
                        a=(( $a + 1 ))
                        echo "Appending $file to present copy in irclogs..."
                        cat "${nlogdir}/${file}" >> "${ologdir}/${file}"
                # Else, move new logfile to old logdir, preserving subdirectory.
                else
                        m=(( $m + 1)
                        echo "Moving $file to '${ologdir}, as it does not exist..."
                        mv "${nlogdir}/${file}" "${ologdir}/${file}"
                fi
        fi
done
echo "[!] Done! Performed $a merges, $m moves, and $d deletions."

# Delete new logdir
while true ; do
        read "Delete '${nlogdir}' (y/n)? " deleteq
        case deleteq in
                [Yy]*) rm -rf "$nlogdir" ; break ;;
                [Nn]*) break ;;
        esac
done

exit 0

#EOF