SHIFT-COMMAND-SHELL-SCRIPT.txt

https://www.computerhope.com/unix/bash/shift.htm

#!/bin/bash
# Scan directories for old files (over 365 days) and delete them.
USAGE="Usage: $0 dir1 dir2 dir3 ..."
if [ "$#" == "0" ]; then                      # If zero arguments were supplied,
  echo "Error: no directory names provided."
  echo "$USAGE"                               # display a help message
  exit 1                                      # and return an error.
fi
while (( "$#" )); do        # While there are arguments still to be shifted...
  while IFS= read -r -d $'\0' file; do
    echo "Removing $file..."
    rm $file
  done < <(find "$1" -type f -atime +365 -print0)
  shift
done
echo "Done."
exit 0

=============================================================================================
#!/bin/bash

while [[ $1 ]];do
  case $1 in
    -f | --file)
       FILE=$2
       shift
      ;;
   -n | --name)
       NAME=$2
       shift
      ;;
   -p | --password)
       PASS=$2
        shift
     ;;
  esac
 shift
done

for I in $FILE
do
NAME=$(echo $I|tr ',' '\n')
for J in $NAME
do
echo $J
done
done



rcxdev@rcxdev:/tmp$ bash  check.sh --file jenkins,subham,mandal,ram
jenkins
subham
mandal
ram

==============================================================================================


while [ "$1" ]
do
   if [ "$1" = "-b" ]; then
        ob="$2"
        case $ob in
          16) basesystem="Hex";;
           8) basesystem="Oct";;
           2) basesystem="bin";;
           *) basesystem="Unknown";;
        esac
       shift 2
   elif [ "$1" = "-n" ]
   then
      num="$2"
      shift 2
   else
      echo "Program $0 does not recognize option $1"
      exit 1
   fi
done
output=`echo "obase=$ob;ibase=10; $num;" | bc`
echo "$num Decimal number = $output in $basesystem number system(base=$ob)"