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What's wrong with my bash script to iterate over files
#!/bin/bash

file="release-candidate-1.0.tar.gz"
patch_base="patch-1.0."
patch_extension=".tar.gz"
i="1"

while [ -f $file ]
do
    echo $file
    file="${patch_base}${i}${patch_extension}"
    i=$((i+1))
done

# ./script.sh
file=release-candidate-1.0.tar.gz: Command not found.
path_base=patch-1.0.: Command not found.
patch_extension=.tar.gz: Command not found.
i=1: Command not found.
file: Undefined variable.
#

#!/bin/bash

file="release-candidate-1.0.tar.gz"
patch_bas="patch-1.0."
patch_extension=".tar.gz"
i="1"

while [ -f $file ]
do
    echo $file
    file="${patch_base}${i}${patch_extension}"
    i=$((i+1))
done

for i in {1..10} ; do
   file="${patch_base}${i}${patch_extension}"
   if [ -f ${file} ] ; then
      echo "Found ${file}"
   else
      echo "NO ${file}"
   fi
done

file="release-candidate-1.0.tar.gz"
patch_base="patch-1.0."
patch_extension=".tar.gz"
i="1"

/bin/bash -vx script.sh

portsnap fetch
portsnap extract update
cd /usr/ports/shells/bash
make install clean

#!/usr/local/bin/bash

file="release-candidate-1.0.tar.gz";
patch_base="patch-1.0.";
patch_extension=".tar.gz";
last_patch=500;
got_all_files=1;

for (( i = 0; i <= $last_patch; i++))
do
    if [ $i -eq 0 ]
    then
        if [ ! -f $file ]
        then
            got_all_files=0;
        fi
    else
        file=$patch_base$i$patch_extension;
        if [ ! -f $file ]
        then
            got_all_files=0;
        fi
    fi
done

if [ $got_all_files -eq 0 ]
then
    echo "Missing files.";
    exit;
fi

file="release-candidate-1.0.tar.gz";

for (( i = 0; i <= $last_patch; i++))
do
    if [ $i -eq 0 ]
    then
        tar xzvpf $file
        ./install.sh
        ./services restart
    else
        file=$patch_base$i$patch_extension;
        tar xzvpf $file
        ./patch.sh
    fi
done