Shell Programming and Scripting

cp junkfile /tmp/junkfile

sp_cp junkfile /tmp/junkfile

#! /bin/bash
#
# script to backup a file in current directory
# will read directory analyzing scriptname.???
# take the last ??? & increment by one
# finally cp scriptname to scriptname.###
#
# 07/29/2008,jmg  Program Create

clear
# set variables

# verify correct number of parameters
if [ "$#" -ne 1 ]
   then
      echo "This program makes a copy of a program or script"
      echo "copying from scriptname to scriptname.001 (or next number)"
      echo "[located at /opt/dputils] "
      echo " "
      echo "Incorrect number of arguments"
      echo "command scriptname -- examples are"
      echo "script_bk pcsmain"
      echo "script_bk runedit"
      echo " "
      exit
fi

# read the parameters
scriptname="$1"

# determine if any archive copies currently exist
num_arc=$(ls -l "$scriptname".* 2>/dev/null | wc -l)
if [ $num_arc -ge 999 ]
   then
   echo "Warning - already 999 files; please review versions"
   echo "Program terminating"
   exit
fi

if [ $num_arc -eq 0 ]
   then
      arc_ver="001"
   else
      arc_v=$((num_arc+1))
      arc_ver=$(printf "%.3d" "$arc_v")
fi

# make the actual archive file
echo "Copying "$scriptname" to "$scriptname"."$arc_ver
cp $scriptname $scriptname"."$arc_ver

exit 0