md5pv: md5sum with pv and output as file

0-md5pv-readme.md

md5pv: md5sum with pv and output as file

Add progress bar to your md5sum, and save the output as file!

Requirements

md5sum and pv must be installed on the target machine.

Installation

Just download the script and put it into your $PATH and make it executable.

Usage

$ md5pv [-w] filename

Flags

-h: The help message
-w: Write hash output to a .md5 file next to the checked file

References

• nixCraft: Bash Shell Script Function Examples
• StackOverflow: How do I pass in optional flags and parameters to bash script?

md5pv

#!/bin/bash
# md5pv: md5sum with pv and output as file

# Define usage function
usage(){
  echo -e "$0: md5sum with pv and output as file\nUsage: $0 [-w] filename"
  echo -e "Flags:\n  -h\tThis message\n  -w\tWrite hash output to a .md5 file next to the checked file"
  exit 1
}

# Define is_file_exists function
# $f -> store argument passed to the script
is_file_exists() {
  local f="$1"
  [[ -f "$f" ]] && return 0 || return 1
}

# Invoke usage
# call usage() function if filename not supplied
[[ $# -eq 0 ]] && usage

# Flag detection
write=false
while getopts :hw opt; do
  case $opt in 
    h) usage; exit ;;
    w) write=true ;;
   \?) echo "$0: Unknown option -$OPTARG"; exit 1 ;;
  esac
done
shift $(( OPTIND - 1 ))

# Invoke is_file_exists
if ( is_file_exists "$1" )
then
  output=$(pv $1 | md5sum | awk "{print \$1}")
  if ( write )
  then
    fname=$(echo $1 | awk -F "/" "{print \$NF}")
    echo "$output $fname" > "$1.md5"
  fi
  echo "$output $1"
else
  echo "$0: File not found"
fi