Question

Write a Bash script called move that could replace the UNIX command mv. 'move' tries to rename the source file (using the UNIX command mv), but if the destination file exists, appends an index number, a sort of version number, to the destination file. So if the user types:

move a.txt b.txt

and b.txt already exists, move will rename the file to b.txt.1. If b.txt.1 already exists, move must rename the file to be b.txt.2, and so on, until the file can be successfully renamed with a name that does not already exist.

Answer 1

Bash Script:

#!/bin/bash

# Fetching file name from arguments
SFile="$1"
DFile="$2"
name=$DFile
serial=1

while [ 1 ]
do
   # Checking for existence of file
   if [ ! -e "$DFile" ]; then
       break
   # If file exist already
   else
       DFile="$name$serial"
       serial=$(($serial+1))
      
   fi
done

# Performing move option
mv $SFile $DFile

# Printing result
echo "Moved to file: "
echo $DFile

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Sample Run:

anil@ubuntu:- ./move.sh bba bcom Moved to file: bcom2 anil@ubuntu:-S touch bba anil@ubuntu:-$ ./move.sh bba bcom Moved to file: bcom3 anil@ubuntu:-S touch bba anil@ubuntu:-$ ./move.sh bba bcom Moved to file: bcom4 anil@ubuntu:-S touch bba anil@ubuntu:-$ ./move.sh bba bcom Moved to file: bcom5 anil@ubuntu:-$