Shell Programming and Scripting

#!/bin/bash

# Some codes goes here


        for ((offset=$thumbStart; offset<=$thumbEnd; offset+=10)) # LINE 459
        do
        printf -v outfile "$filePNG"_"%03d.png" "$((++n))"

        ffmpeg -itsoffset -$offset -i $fileFinal -vcodec mjpeg -vframes 1 -an -f rawvideo -s 640x480 "$outfile"

        done

        mv *.png $path2thumb

         fi # End if [ $thumb -eq 0 ]

        multipleThumbs=$?

        } # end multipleThumbs

# sh runScript.sh 
smartCode.sh: 459: functions.sh: Syntax error: Bad for loop variable

        for ((offset=$thumbStart; offset<=$thumbEnd; offset+=10)) # LINE 459
        do
        printf -v outfile "$filePNG"_"%03d.png" "$((++n))"

        ffmpeg -itsoffset -$offset -i $fileFinal -vcodec mjpeg -vframes 1 -an -f rawvideo -s 640x480 "$outfile"

        for ((Offset=$thumbStart; Offset<=$thumbEnd; Offset+=10)) # LINE 459
        do
        printf -v outfile "$filePNG"_"%03d.png" "$((++n))"

        ffmpeg -itsoffset -$Offset -i $fileFinal -vcodec jpeg -vframes 1 -an -f rawvideo -s 640x480 "$outfile"

#!/bin/bash

for (( i=0; i<=10; i+=2 ))
do
 echo "Welcome $i times" 
done

sh.sh: 3: sh.sh: Syntax error: Bad for loop variable

Last login: Sat Aug 13 12:31:55 on ttys000
AMIGA:barrywalker~> dash
AMIGA:\u\w> #!/bin/bash

for (( i=0; i<=10; i+=2 ))
do
 echo "Welcome $i times" 
doneAMIGA:\u\w> AMIGA:\u\w> dash: 3: Syntax error: Bad for loop variable
AMIGA:\u\w> dash: 3: Syntax error: "do" unexpected
AMIGA:\u\w> AMIGA:\u\w> Welcome  times
AMIGA:\u\w> exit
dash: 5: doneexit: not found
AMIGA:\u\w> exit
AMIGA:barrywalker~> 
AMIGA:barrywalker~> #!/bin/bash
AMIGA:barrywalker~> 
AMIGA:barrywalker~> for (( i=0; i<=10; i+=2 ))
> do
>  echo "Welcome $i times" 
> done
Welcome 0 times
Welcome 2 times
Welcome 4 times
Welcome 6 times
Welcome 8 times
Welcome 10 times
AMIGA:barrywalker~> _

# bash -version
GNU bash, version 4.3.11(1)-release (x86_64-pc-linux-gnu)
Copyright (C) 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>

This is free software; you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

OS, ker|rel, machine: Linux, 3.16.0-73-generic, x86_64
Distribution        : Ubuntu 14.04.2 (KDE, Trusty Tahr) 
bash GNU bash 4.3.11

OS, ker|rel, machine: Linux, 3.16.0-4-amd64, x86_64
Distribution        : Debian 8.4 (jessie) 
bash GNU bash 4.3.30

# mv sh.sh test.sh
# sh test.sh 
test.sh: 3: test.sh: Syntax error: Bad for loop variable