Shell Programming and Scripting

function f1 {


 } 
 egrep -v '^#' list_file \
 | while read arg1 arg2 arg3 arg4; do 
  f1 $arg1 $arg2 $arg3 $arg4   
done

./my_script file1

skrynesaver@busybox ~/tmp$ cat tmp.sh 
#!/bin/bash
function f1 { echo  $(($1 + $2 + $3 + $4 )) ;  }

while read line ; do
	echo $line | grep -e '^#' >>$1 || f1 $line
done < ~/tmp/tmp.dat

skrynesaver@busybox ~/tmp$ cat tmp.dat
# comment 1
# comment 2
10 20 12 9
#comment 3
12 4 6 7 
#comment 4
skrynesaver@busybox ~/tmp$ ./tmp.sh comments
51
29
skrynesaver@busybox ~/tmp$ cat comments
# comment 1
# comment 2
#comment 3
#comment 4
skrynesaver@busybox ~/tmp$

./myscript mylogname

egrep '^#' list_file 
#!/bin/bash
# This is a comment
# This is another comment

f1() {
  :                             # put your function here
} 

[ $# -eq 1 ] || exit 1          # exit when no file provided
outfile=$1                      # this is the file that the user provides on the command line

while read line; do
  case $line in               
    \#*) echo "$line"           # Skip the comment
         ;;
      *) set -- $line           # split $line into positional parameters
         f1 "$@"                # call f1 with the positional parameters
         ;;
  esac
done < list_file > "$outfile"   # read from list_file, write to $outfile

function f1 {


 } 
 egrep -v '^#' list_file \
 | while read arg1 arg2 arg3 arg4; do 
  f1 $arg1 $arg2 $arg3 $arg4   
done

./my_script list_file

./my_script

./my_script 10 20 srv_log srv4

#!/bin/bash
# set -vx

f1()    {
         echo $1 $2 $3 $4                                       # put your function here
        } 


case $# in
        0)      echo -e "# comment1\n# comment2" > list_file    # create list_file as desired
                read -p "Please fill in this list_file: "       # prompt as desired, read answer
                echo $REPLY                                     # do whatever with the user's reply
                ;;
        1)      [ -f "$1" ] || exit                             # check if file exists; otherwise exit
                grep -v '^#' "$1" |                             # do what you did before
                        while read arg1 arg2 arg3 arg4
                                do f1 $arg1 $arg2 $arg3 $arg4
                                done
                ;;
        4)      echo -e "# comment1\n# comment2" > list_file    # create list_file as desired
                echo $1 $2 $3 $4 >> list_file                   # put your function here
                ;;
        *)      echo "error msg"; exit
esac

$ ./test X Y Z S
$ cat list_file
# comment1
# comment2
X Y Z S