dynamic case

[hok1man]

Hi guys,

I was wondering whether we can do dynamic in case options from a file :

for example in a file content like this :
step_first.ksh
step_second.ksh
step_third.ksh


so in normal static case selection it would look like this.

case "$SELECT" in
1) step_first.ksh ;;
2) step_second.ksh ;;
3) step_third.ksh ;;
esac

how if I would like to make it dynamic, so if I put step_four.ksh in the file, I don't have to change my script.

Any idea would be appreciated.

Thanks guys

 

[Mike042]

Here's an idea for a script:
- read the file of 'script-names'
- create the commands for the case statement and write them to a file in /tmp (as a script)
- run the /tmp script (which prompts for $SELECT and runs the chosen named script)
- do any further processing required
- delete the /tmp/script
- exit

The only file that will need updating is the file containing the 'script-names'


I hope that helps, and makes sense.

Mike

 

[SamBones]

If you file is called [tt]scripts.dat[/tt]...

step_first.ksh
step_second.ksh
step_third.ksh

...you can do this...

#!/bin/ksh

SELECT=2

print $SELECT | select CHOICE in $(<scripts.dat)
do
    print "You selected $CHOICE"
    break
done

Then, all you do is add new options to [tt]scripts.dat[/tt] and they will be automatically added to the options you can select from.

If you want it to be interactive and have someone type the option, it's like this...

#!/bin/ksh

select CHOICE in $(<scripts.dat)
do
    print "You selected $CHOICE"
    break
done

You can fine tune and tweak for your particular problem.

 

[columb]

The following code snippet is probably a bit over the top for what you want but it's a general purpose menu using ksh arrays

do_menu()
  {
  while :
  do
    # Clear the screen
    tput clear
    # Display the header
    echo "\n\n\t$(tput smso)$header$(tput rmso)\n"
    # Display any error message
    [[ -n "$message" ]] && { echo "\t$message\n"; message=; }
    # Display menu lines
    IDX=1
    while [ $IDX -lt ${#contents[*]} ]
    do
      printf "\t%2.2s - %s\n" $IDX "${contents[$IDX]}"
      (( IDX += 1 ))
    done
    echo "\n\t Q - Quit\n\n\t\c"
    # Read reply
    read ans
    # Handle blank answer
    [[ -z "$ans" ]] && {
      message="No response given"
      continue
      }
    # If ans == 'q' then quit
    [[ $ans = 'q' || $ans = "Q" ]] && exit
    # Check the answer is pure numeric
    expr $ans : "^[0-9]*$" > /dev/null || {
      message="Please enter numbers only"
      continue
      }
    # Check answer is within range
    [[ $ans -lt 1 || $ans -ge ${#contents[*]} ]] && {
      message="$ans is not a valid response"
      continue
       }
    # All tests passed - return ans
    return $ans
  done
  }

Before calling it you would have something along the lines of

IFS='
'
header="This is a menu header"
set -A contents "" "Selection Choice 1" "Selection Choice 2"
do_menu

So, if your selections are in a file you would use

IFS='
'
header="This is a menu header"
set -A contents "" $(< /path/to/file/with/selections)

Things to note are[ul]
[li]The first entry in the array is a null string. This is to get round the fact that ksh arrays start at 0 whereas user friendly menus start at 1[/li]
[li]The IFS has to be set to CR to prevent spaces in the menu choices being seen as record seperators[/li]
[li]The choice is returned as an error value[/li][/ul]



On the internet no one knows you're a dog

Columb Healy

 

[hok1man]

Hi Sambones,

Unfortunately there are some scripts we need to sudo, so in the script.dat would be :

step_first.ksh
step_second.ksh
sudo su - appadm -c "step_third.ksh"

after I put in select, they divided word by word, so it becomes

 1) sudo
 2) su
 3) -
 4) appadm
 5) -c
 6) "step_third.ksh"

how do I parse it by line ?

Thanks mate

 

[PHV]

You may try this:

#!/bin/ksh
[!]IFS="
"[/!]
select CHOICE in $(<scripts.dat)
do
    print "You selected $CHOICE"
    break
done

Hope This Helps, PH.
FAQ219-2884
FAQ181-2886