Shell Programming and Scripting

123-12345-00.sct
123-12345-00.mot
123-12345-01.mot
123-12345-02.mot
123-12345-03.mot
123-12345-04.mot
123-12345-05.mot
123-12346-00.sct
123-12346-00.mot
123-12346-01.mot
123-12346-02.mot
123-12346-03.mot
123-12346-04.mot
123-12346-05.mot

 if [ ! -d "$dir" ]; then echo "$0: $dir: no such directory"; exit; fi;

  #! /usr/bin/env bash
    dir="$1"
    count="$2"
    [ "$dir" ] && [ $count -gt 0 ] && {
           if [ ! -d "$dir" ]; then echo "$0: $dir: no such directory"; exit; fi;
           RANDOM=$$$(date +%s)                    #init random seed
           for (( c=0; c < $count; c++ )); do
                files=(*.sct)                       #creates array of sct files
                  ct=${#files[@]}                     #computes array length
                if [ $ct -eq 0 ]; then break; fi
                sct=${files[$[($RANDOM % $ct)]]}    #pick random file
                prefix=$(echo $sct | sed 's:\(.*-\).*:\1:')
                mot_files=($(ls $prefix*.mot 2> /dev/null))
                mv $sct $dir
            if [ ${#mot_files[@]} -gt 0 ]; then 
                mv ${mot_files[@]} $dir  #
            fi
            done
        } || echo "usage: $0 <dir> <num of files>"

++ dir=$’\r’
++ count=$’\r’
++ ‘[‘ $ ‘\r’ ‘]’
++ ‘[‘ –gto ‘]’
./random_select.sh: line 4: [:-gt:unary operator expected
++ ‘[‘ ‘!’ –d$ ‘\r’ ‘]’
: no such directory ‘lect.sh
:no such directory
++ exit

tr -d '\r' random_select.sh