Creating a file system for ARM development board under Linux

#!/bin/bash
#yuanxin.yang develop 2015-07-05
#Path of file system and Busybox ====>You can customize it yourself FILESYSTEM=/Softwave/filesystem #Define the location of the file system you made BUSYBOX=/Softwave/arm/busybox-1.17.2 #Location of Busybox software LIBS=/usr/local/arm/4.5.1/arm-none-linux-gnueabi #Location of cross-compilation related library files #Judge whether the file exists and delete it if it exists if [ -d $FILESYSTEM ]
then
  rm -rf $FILESYSTEM &>/dev/null
  mkdir $FILESYSTEM &>/dev/null 
else
  mkdir $FILESYSTEM &>/dev/null 
fi
#Copy busybox related files if ! cp -rf $BUSYBOX/_install/* $FILESYSTEM &>/dev/null
then
  echo "cp busybox failed..."
  exit 1
fi
#Copy libraryif !cp -rf $LIBS/lib/ $FILESYSTEM/ &>/dev/null
then
  echo "copy libs fair...."
  exit 1
fi
#Copy etc
if ! cp -rf $BUSYBOX/examples/bootfloppy/etc $FILESYSTEM &>/dev/null
then
  echo "copy etc fair..."
  exit 1
fi
#Create Linux related directories cd $FILESYSTEM &>/dev/null
mkdir boot mnt root sys var net proc tmp dev home opt &>/dev/null
#Modify the configuration file echo > $FILESYSTEM/etc/fstab 
#Modify the etc/profile file echo "# /etc/profile: system-wide .profile file for the Bourne shells" > $FILESYSTEM/etc/profile
echo "echo \"===========================\"" >> $FILESYSTEM/etc/profile
echo "echo \"Welcom to Linux System\"" >> $FILESYSTEM/etc/profile
echo "echo \"===========================\"" >> $FILESYSTEM/etc/profile
echo "export PS1=\"[jiaobenzhijia@Linux \W] # \"" >> $FILESYSTEM/etc/profile
#Modify etc/init.d/rcS
echo "#!/bin/sh" > $FILESYSTEM/etc/init.d/rcS
echo "/bin/mount -n -t proc none /proc" >> $FILESYSTEM/etc/init.d/rcS 
echo "/bin/mount -n -t sysfs none /sys " >> $FILESYSTEM/etc/init.d/rcS 
echo "/bin/mount -t ramfs none /dev " >> $FILESYSTEM/etc/init.d/rcS 
echo "/bin/mount -n -t ramfs none /tmp " >> $FILESYSTEM/etc/init.d/rcS 
echo "/sbin/mdev -s" >> $FILESYSTEM/etc/init.d/rcS  
#Configure nfs service if ! grep "$FILESYSTEM" /etc/exports &>/dev/null
then
  echo "/filesystem *(rw,sync,no_root_squash)" >> /etc/exports
fi
#Start the service iptables -F &>/dev/null
service rpcbind restart 
service nfs restart 
echo "make filesystem ok....."
exit 0