Renaming files in a folder (linux)

Question

I have a different HTML files in a folder. How to rename the files so that they have the names of:

1.html
2.html
3.html
...

Answer 1

This can make it:

i=1
for file in /your/folder/*
do
   mv $file ${i}.html
   i=$((i+1)) #((i++)) was giving errors (see comments)
done

It loops through all files in /your/folder and renames them according to the number $i that keeps increasing.

Answer 2

Here is my script

#!/bin/sh
#
#       batchrename - renames files like 01.ext, 02.ext ...
#   
#   format :  batchrename <list of files>
#        or:              -r <extension> <<list of files> or <dir>>
#   -r - recoursively
counter=0
extrec=""
if [ "$#" -lt "1" ]; then
    echo -e "\n\t\tUsage:\n\tbatchrename [opt]\nopt:"
    echo -e "-r <ext> <folder> (or file list) -- renames recoursively ALL files"
    echo -e "\tin folder <folder> (or by file list given)  with extension .<ext>"
    echo -e "<folder> -- renames ALL files in folder given"
    echo -e "<file list> -- renames ALL files of given filelist.\n\n"
    exit 0
fi
Name="$*"
if [ "$1" = "-r" ]; then
    extrec="$2"
    shift
    shift
    Name="$*"
    [ "$Name" = "" ] && Name="./"
fi
echo -e "\n\t\t\tRENAMING"

for file in $Name
do
file=`echo "$file" | sed "s/<>/ /g"`
    if [ -d "$file" ];then
    echo -e "\nDiving into \033[38m $file \033[39m"
    cd "$file"
    if [ "$extrec" != "" ]; then
        batchrename -r $extrec `ls -1 | sed "s/\ /<>/g"`
    else
        batchrename `ls -1 | sed "s/\ /<>/g"`   
    fi
    cd ../
    continue
    fi
    ext=`ext "$file"`
    if [ "$ext" = "ion" ]; then
    continue
    fi
    if [ "$extrec" = "" -o "$ext" = "$extrec" ];then
        counter=`expr $counter + 1`
    echo -e "Progress: $counter files\r\c"
        mv "$file" "rnmd$counter.$ext"
    fi
done
echo -e "\n\n\t\t\tENDING"
digits=`echo $counter|awk '{print length ($0)}'`
cnt=1
while [ $digits -gt $cnt ]
do
    f=`ls -S -1|grep "rnmd[0-9]\{$cnt\}\."`
    rename rnmd rnmd0 $f
    cnt=`expr $cnt + 1`
done
if [ "$counter" -gt "0" ]; then
    rename rnmd "" rnmd*
fi
echo -e "\n\t\t\tDone !!!\n"

After renaming all your files will looks like 001.file, 002.file, ... and so on. Amount of leading zeros depends on amount of files. So, after renaming ls will show right order of files!

It use intermediate script ext:

#!/bin/sh
#
#       ext - returns file suffix (case-unsensitive)
#
File="$*"
if [ -d "$File" ]; then
    echo ""
    exit 0
fi
EXT=`echo $File|sed 's/.\{1,\}\.//g'`
if [ "$EXT" = "$File" ]; then
    EXT=""
fi
echo $EXT| tr '[:upper:]' '[:lower:]'