Моделируйте действие команды mv

Этот сценарий должен добиться цели. Это может обработать несколько исходных файлов/каталогов, также. Используйте его тот же способ, которым Вы использовали бы mv - mvsim source... dest. Обратите внимание, что это не обращает внимание на опции, и при этом это не фильтрует их (это просто рассматривает их как имена файлов), и это не могло бы работать хорошо с символьными ссылками.

#!/bin/bash

if [ $# -lt 2 ]; then
    echo "Too few arguments given; at least 2 arguments are needed."
    exit 1
fi

lastArg="${@:$#}"

i=1
for param in "$@"; do
    if [ ! -e "$param" -a $i -lt $# ]; then
        echo "Error: $param does not exist."
        exit 1
    elif [ "$param" = "$lastArg" -a $i -lt $# ]; then
        echo "Error: $param is the same file/directory as the destination."
        exit 1
    fi
    ((i++))
done

if [ $# -eq 2 ]; then # special case for 2 arguments to make output look better
    if [ -d "$1" ]; then
        if [ -d "$2" ]; then
            echo "Moves directory $1 (and anything inside it) into directory $2"
            exit 0
        elif [ ! -e "$2" ]; then
            echo "Renames directory $1 to $2"
            exit 0
        else
            echo "Error: $2 is not a directory; mv cannot overwrite a non-directory with a directory."
            exit 1
        fi
    else
        if [ -d "$2" ]; then
            echo "Moves file $1 into directory $2"
        elif [ -e "$2" ]; then
            echo "Renames file $1 to $2, replacing file $2"
        else
            echo "Renames file $1 to $2"
        fi
        exit 0
    fi
elif [ ! -e "$lastArg" ]; then
    echo "Error: $lastArg does not exist."
    exit 1
elif [ ! -d "$lastArg" ]; then
    echo "Error: $lastArg is not a directory; mv cannot merge multiple files into one."
    exit 1
fi

argsLeft=$#
echo "Moves..."
for param in  "$@"; do
    if [ $argsLeft -eq 1 ]; then
        echo "...Into the directory $param" # has to be a directory because -f $lastArg was dealt with earlier
        exit 0
    fi
    if [ -d "$param" ]; then
        if [ ! -d "$lastArg" ]; then
            echo "Error: $lastArg is not a directory; mv cannot overwrite a non-directory with a directory."
            exit 1
        fi
        if [ $argsLeft -eq $# ]; then
            echo "The directory ${param} (and anything inside it)..."
        else
            echo "And the directory ${param} (and anything inside it)..."
        fi
    else
        if [ $argsLeft -eq $# ]; then
            echo "The file ${param}..."
        else
            echo "And the file ${param}..."
        fi
    fi
    ((argsLeft--))
done

Некоторые примеры:

$ ls
dir1  dir2  file1  file2  file3  mvsim
$ ./mvsim file1 file2
Renames file file1 to file2, replacing file file2
$ ./mvsim file1 newfile
Renames file file1 to newfile
$ ./mvsim file1 dir1
Moves file file1 into the directory dir1
$ ./mvsim file1 file2 file3 dir1
Moves...
The file file1...
And the file file2...
And the file file3...
...Into the directory dir1
$ ./mvsim file1 file2 dir1 dir2
Moves...
The file file1...
And the file file2...
And the directory dir1 (and anything inside it)...
...Into the directory dir2
$ ./mvsim file1 file2 file3 # error - file3 isn't a directory
Error: file3 is not a directory; mv cannot merge multiple files into one.
$ ./mvsim -f -i file1 dir1 # options aren't parsed or filtered out
Error: -f does not exist.