Bash script

hw22-3

# Write a bash script named "hw22-3" that accepts a list of inode numbers from the command line,
#     and displays
#     the file name and physical file system of each file with that inode number.  If no
#     file exists with that inode number display "no such file".
#
#     EXAMPLE:
#               > hw22-3 8384567 12345
#                 Inode "8384567" has files:
#                         main.cpp on /dev/mapper/system-student
#
#                 Inode "12345" has files:
#                         No such file

# With this version, I can enter a known inode with a file, and I get stuff back that doesn't seem right, AND
# I also put in inode "fvdfvafd" and that shouldn't come up with anything, but it comes up with the same stuff.
# At one point, it was returning the right stuff. But... well, it was 4AM when last I worked on it.

#!/bin/bash

# The way I read the problem, this needs to act on ARGS rather than STDIN
# read -a inodes

for inode in ${@}
do
  # This will always make $filename empty, because your main redirect is
  # /dev/null. Also, adding the / as the path will keep most variants of
  # `find` from screaming.
  #filename=$(find -inum $i > /dev/null 2>&1)

  echo "Inode \"${inode}\" has files:"

  # Set up a loop-sentinel so we can determine if any files were found for the
  # inode in question.
  found="no"

  # Note: This will likely die in a fire if a candidate comes up that has white
  #       space in the filename. For our purposes here, though, it ought to be
  #       good enough for government work.
  for filename in $(find / -inum ${inode} 2>/dev/null)
  do
    # If there are any files returned by the `find`, 
    found="yes"

    file_system=$(df "${filename}" 2>/dev/null | awk '{if(NR>1)print $1}')
    echo -e "\t${filename} on ${file_system}"
  done

  # By this point, if the above inner loop ran, $found should be "yes."
  # Otherwise, that means we didn't find any files for the inode in question.
  if [ "${found}" == "no" ]
  then
    echo -e "\tNo such files"
  fi

  # Let's dump out a single echo just to separate the inode entries
  echo
done

with_functions.sh

#!/bin/bash

# Return the file system device on which a given file lives
file_system() {
  filename=${1}

  df "${filename}" 2>/dev/null | awk '{if(NR>1)print $1}'
}

# Find and print out the details of each file associated with a given inode
# number on any file system mounted on the box.
find_files() {
  inode=${1}
  found=0

  for filename in $(find / -inum ${inode} 2>/dev/null)
  do
    found=1
    echo -e "\t${filename} on $(file_system "${filename}")"
  done

  # If we found something, return true. Otherwise, false.
  [ "${found}" -eq 1 ]
}

main() {
  for inode in ${@}
  do
    echo "Inode \"${inode}\" has files:"

    # If files are found, we let `find_files` handle the output. Otherwise,
    # we declare that no files were found.
    find_files "${inode}" || echo -e "\tNo such file"

    # Let's add a newline between each inode report
    echo
  done
}

# The way I read the problem, this needs to act on ARGS rather than STDIN
# read -a inodes

main $@