#!/bin/sh # vim: set sw=4 ts=4 et: help() { 　cat < b2h -- convert binary to decimal USAGE: b2h [-h] binarynum OPTIONS: -h help text EXAMPLE: b2h 111010 will return 58 HELP 　exit 0 } error() { 　　# print an error and exit 　　echo "$1" 　　exit 1 } lastchar() { 　　# return the last character of a string in $rval 　　if [ -z "$1" ]; then 　　　　# empty string 　　　　rval="" 　　　　return 　　fi 　　# wc puts some space behind the output this is why we need sed: 　　numofchar=`echo -n "$1" | wc -c | sed 's/ //g' ` 　　# now cut out the last char 　　rval=`echo -n "$1" | cut -b $numofchar` } chop() { 　　# remove the last character in string and return it in $rval 　　if [ -z "$1" ]; then 　　　　# empty string 　　　　rval="" 　　　　return 　　fi 　　# wc puts some space behind the output this is why we need sed: 　　numofchar=`echo -n "$1" | wc -c | sed 's/ //g' ` 　　if [ "$numofchar" = "1" ]; then 　　　　# only one char in string 　　　　rval="" 　　　　return 　　fi 　　numofcharminus1=`expr $numofchar "-" 1` 　　# now cut all but the last char: 　　rval=`echo -n "$1" | cut -b 0-${numofcharminus1}` } while [ -n "$1" ]; do case $1 in 　　-h) help;shift 1;; # function help is called 　　--) shift;break;; # end of options 　　-*) error "error: no such option $1. -h for help";; 　　*) break;; esac done # The main program sum=0 weight=1 # one arg must be given: [ -z "$1" ] && help binnum="$1" binnumorig="$1" while [ -n "$binnum" ]; do 　　lastchar "$binnum" 　　if [ "$rval" = "1" ]; then 　　　　sum=`expr "$weight" "+" "$sum"` 　　fi 　　# remove the last position in $binnum 　　chop "$binnum" 　　binnum="$rval" 　　weight=`expr "$weight" "*" 2` done echo "binary $binnumorig is decimal $sum" #

#!/bin/sh # vim: set sw=4 ts=4 et: ver="0.1" help() { 　　cat < rotatefile -- rotate the file name USAGE: rotatefile [-h] filename OPTIONS: -h help text EXAMPLE: rotatefile out This will e.g rename out.2 to out.3, out.1 to out.2, out to out.1 and create an empty out-file The max number is 10 version $ver HELP 　　exit 0 } error() { 　　echo "$1" 　　exit 1 } while [ -n "$1" ]; do case $1 in 　　-h) help;shift 1;; 　　--) break;; 　　-*) echo "error: no such option $1. -h for help";exit 1;; 　　*) break;; esac done # input check: if [ -z "$1" ] ; then error "ERROR: you must specify a file, use -h for help" fi filen="$1" # rename any .1 , .2 etc file: for n in Array 8 7 6 5 4 3 2 1; do 　　if [ -f "$filen.$n" ]; then 　　　　p=`expr $n + 1` 　　　　echo "mv $filen.$n $filen.$p" 　　　　mv $filen.$n $filen.$p 　　fi done # rename the original file: if [ -f "$filen" ]; then 　　echo "mv $filen $filen.1" 　　mv $filen $filen.1 fi echo touch $filen touch $filen