Coloured logs

 #!/bin/sh
 #
 # CatCuBeLog
 # by MeatROme - historically interesting, done by engine-code nowadays ;)
 
 C_="\033[m"
 
 # 0 : green, 1 : blue, 2 : yellow, 3 : red, 4 : gray, >=5 : white
 # 0 : 32     1 : 34    2 : 33      3 : 31   4 : 37      5 : 1
 
 C0=32
 C1=36
 C2=33
 C3=31
 
 # post gui-release| sed s/^/"$C5"/g 
 C4="1\;30"
 C5="1\;37"
 
 S0=""
 if [ "$1" != "-" ]
 then
 	S0="$(cat "${1}" | sed 's/^/\\033[40m\\033[1;37m\ /g')"
 else
 	S0="$(cat /dev/stdin | sed 's/^/\\033[40m\\033[1;37m\ /g')"
 fi
 S1=$S0
 CX=0
 for cc in $C0 $C1 $C2 $C3 $C4 $C5; do
 	S1=$(echo "$S1" | sed s/^${CX}/\\\\033[${cc}m/g)
 	CX=$(echo 1+$CX|bc)
 done
 # eliminate other colour-chars quietly
 S2=$(echo "$S1" | sed 's/^./\\033[1;37m/g')
 S1="$S2"
 # eliminate dangling colour setting
 S3=$(echo "$S1" | sed 's/$/\\033[m/g')
 S1="$S3"
 if [ -n "$2" ]
 then
 	case "$2" in
 		"-s")
 			echo "$(echo "$S1$C_" | awk -f /usr/local/bin/.awk/history.awk | sort -n | sed 's/\ /\\033[1;37m\t\t/2' | sed 's/^/\ \\033[1;34m/g')"
 		;;
 		"-u")
 			echo "$S1$C_" | sort | uniq -c | egrep -v "^\ +1\ "
 		;;
 		*)
 			echo "$S1$C_"
 		;;
 	esac	
 else
 	echo "$S1$C_"
 fi

This makes use of the following awk-file .. which I don't remember where I found it originally. If you don't change the location in the source above, place this into /usr/local/bin/.awk/history.awk

 # histsort.awk --- compact a shell history file
 # Thanks to Byron Rakitzis for the general idea
 {
     if (data[$0]++ == 0)
         lines[++count] = $0
 }
 
 END {
     for (i = 1; i <= count; i++)
     print data[lines[i]], lines[i]
 
     #print lines[i]
 
 }

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