1 #!/bin/sh   2   3 # vim: set sw=4 ts=4 et:   4   5 help()   6   7 {   8   9 cat <  10  11 b2h -- convert binary to decimal  12  13 USAGE: b2h [-h] binarynum  14  15 OPTIONS: -h help text  16  17 EXAMPLE: b2h 111010  18  19 will return 58  20  21 HELP  22  23 exit 0  24  25 }  26  27 error()  28  29 {  30  31 # print an error and exit  32  33 echo "$1"  34  35 exit 1  36  37 }  38  39 lastchar()  40  41 {  42  43 # return the last character of a string in $rval  44  45 if [ -z "$1" ]; then  46  47 # empty string  48  49 rval=""  50  51 return  52  53 fi  54  55 # wc puts some space behind the output this is why we need sed:  56  57 numofchar=`echo -n "$1" | wc -c | sed 's/ //g' `  58  59 # now cut out the last char  60  61 rval=`echo -n "$1" | cut -b $numofchar`  62  63 }  64  65 chop()  66  67 {  68  69 # remove the last character in string and return it in $rval  70  71 if [ -z "$1" ]; then  72  73 # empty string  74  75 rval=""  76  77 return  78  79 fi  80  81 # wc puts some space behind the output this is why we need sed:  82  83 numofchar=`echo -n "$1" | wc -c | sed 's/ //g' `  84  85 if [ "$numofchar" = "1" ]; then  86  87 # only one char in string  88  89 rval=""  90  91 return  92  93 fi  94  95 numofcharminus1=`expr $numofchar "-" 1`  96  97 # now cut all but the last char:  98  99 rval=`echo -n "$1" | cut -b 0-${numofcharminus1}` 100 101 } 102 103 while [ -n "$1" ]; do 104 105 case $1 in 106 107 -h) help;shift 1;; # function help is called 108 109 --) shift;break;; # end of options 110 111 -*) error "error: no such option $1. -h for help";; 112 113 *) break;; 114 115 esac 116 117 done 118 119 # The main program 120 121 sum=0 122 123 weight=1 124 125 # one arg must be given: 126 127 [ -z "$1" ] && help 128 129 binnum="$1" 130 131 binnumorig="$1" 132 133 while [ -n "$binnum" ]; do 134 135 lastchar "$binnum" 136 137 if [ "$rval" = "1" ]; then 138 139 sum=`expr "$weight" "+" "$sum"` 140 141 fi 142 143 # remove the last position in $binnum 144 145 chop "$binnum" 146 147 binnum="$rval" 148 149 weight=`expr "$weight" "*" 2` 150 151 done 152 153 echo "binary $binnumorig is decimal $sum"

 1 #!/bin/sh  2  3 # vim: set sw=4 ts=4 et:  4  5 ver="0.1"  6  7 help()  8  9 { 10 11 cat < 12 13 rotatefile -- rotate the file name 14 15 USAGE: rotatefile [-h] filename 16 17 OPTIONS: -h help text 18 19 EXAMPLE: rotatefile out 20 21 This will e.g rename out.2 to out.3, out.1 to out.2, out to out.1 22 23 and create an empty out-file 24 25 The max number is 10 26 27 version $ver 28 29 HELP 30 31 exit 0 32 33 } 34 35 error() 36 37 { 38 39 echo "$1" 40 41 exit 1 42 43 } 44 45 while [ -n "$1" ]; do 46 47 case $1 in 48 49 -h) help;shift 1;; 50 51 --) break;; 52 53 -*) echo "error: no such option $1. -h for help";exit 1;; 54 55 *) break;; 56 57 esac 58 59 done 60 61 # input check: 62 63 if [ -z "$1" ] ; then 64 65 error "ERROR: you must specify a file, use -h for help" 66 67 fi 68 69 filen="$1" 70 71 # rename any .1 , .2 etc file: 72 73 for n in 9 8 7 6 5 4 3 2 1; do 74 75 if [ -f "$filen.$n" ]; then 76 77 p=`expr $n + 1` 78 79 echo "mv $filen.$n $filen.$p" 80 81 mv $filen.$n $filen.$p 82 83 fi 84 85 done 86 87 # rename the original file: 88 89 if [ -f "$filen" ]; then 90 91 echo "mv $filen $filen.1" 92 93 mv $filen $filen.1 94 95 fi 96 97 echo touch $filen 98 99 touch $filen