gistfile1.txt

#!/usr/bin/env bash
set +o noclobber

timestamp=$(date +%Y%m%d%H%M%S)

device="$1"
resolution=300
mode='Black & White'
format=tiff
batch="$timestamp"_%03d.tiff

sleep 0.01
# if [ "$(which usleep  2>/dev/null )" != '' ];then
#     usleep 10000
# else
#     sleep  0.01
# fi

# From: https://github.com/rtomayko/shocco/blob/master/shocco.sh#L108
# Work and Cleanup
# ----------------

# Make sure we have a `TMPDIR` set. The `:=` parameter expansion assigns
# the value if `TMPDIR` is unset or null.
: ${TMPDIR:=/tmp}

# Create a temporary directory for doing work. Use `mktemp(1)` if
# available; but, since `mktemp(1)` is not POSIX specified, fallback on naive
# (and insecure) temp dir generation using the program's basename and pid.
: ${WORK:=$(
      if command -v mktemp 1>/dev/null 2>&1
      then
          mktemp -d "$TMPDIR/$(basename $0).XXXXXXXXXX"
      else
          dir="$TMPDIR/$(basename $0).$$"
          mkdir "$dir"
          echo "$dir"
      fi
  )}

# We want to be absolutely sure we're not going to do something stupid like
# use `.` or `/` as a work dir. Better safe than sorry.
test -z "$WORK" -o "$WORK" = '/' && {
    echo "$(basename $0): could not create a temp work dir."
    exit 1
}

# We're about to create a ton of shit under our `$WORK` directory. Register
# an `EXIT` trap that cleans everything up. This guarantees we don't leave
# anything hanging around unless we're killed with a `SIGKILL`.
trap "rm -rf $WORK" 0

# Change into the work directory. The program will finish up in there.
cd "$WORK"

# Scanning
scanimage --device-name "$device" --resolution "$resolution" --mode "$mode" --format "$format" --batch="$batch"

# Merging scanned tiff files
tiffcp "$WORK"/*.tiff "$WORK"/output.tiff

# Convert tiff to pdf
tiff2pdf -o /home/me/scan_docs/"$timestamp".pdf "$WORK"/output.tiff