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Full Discussion: bash-function with array acting bizarre, bug?
Top Forums Shell Programming and Scripting bash-function with array acting bizarre, bug? Post 302280556 by gand on Tuesday 27th of January 2009 08:39:02 AM
Old 01-27-2009
bash-function with array acting bizarre, bug?
Hello,

basically what this script is supposed to do is showing a list of hosts that is given a number, that you will be able to choose from a list.
A check is made to verify that the chosen number is within the array and this is where things go bad and I don't know why, bizarre.

I've spent quite some time trying to figure out why this function doesn't give the correct output (see below the script).

Code:
HOSTLIST="test1 test2 test3"

List_Hosts ()
{
  num=1
  hosts=
  HI_HOSTS=
  hostlist=(NULL $( echo $HOSTLIST ))
  hostnumbers=${#hostlist[@]}
  for (( i=1; i<${hostnumbers}; i++ )); do
    hosts=$( echo "$hosts($num)-${hostlist[$i]} " )
    let num=num+1
  done
  echo -e "\n$hosts\n"
  echo -n "Enter number(s) (comma-separated - 1,2,3): "
  read input
  if [ -n "$( echo "$input" | tr , " " | tr -d '[0-9]' | awk '{print $1}' )" ]; then
    echo -e "\nNone numerical value \"$input\" entered, please try again."
    List_Hosts
  else
    for hostnum in $( echo "$input" | tr , " " ) ; do
      if [ "$hostnum" -eq 0 -o "$hostnum" -gt $[$hostnumbers-1] ]; then
        echo "Number \"$hostnum\" doesn't match existing values, please try again."
        List_Hosts
      fi
      HI_HOSTS=$( echo "$HI_HOSTS${hostlist[$hostnum]} " )
    done
  fi
}
List_Hosts
echo $HI_HOSTS

output
# ./script.sh
 (1)-test1 (2)-test2 (3)-test3

Enter number(s) (comma-separated - 1,2,3): 4
Number "4" doesn't match existing values, please try again.

(1)-test1 (2)-test2 (3)-test3

Enter number(s) (comma-separated - 1,2,3): 5
Number "5" doesn't match existing values, please try again.

(1)-test1 (2)-test2 (3)-test3

Enter number(s) (comma-separated - 1,2,3): 1,2
test1 test2 test2 test2

for each unmatched number it will add the last entry again. Running it without typing an unmatched number it will give the correct output.
 

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LEARN ABOUT FREEBSD

krb5_get_krb_admin_hst

KRB5_GET_KRBHST(3)					   BSD Library Functions Manual 					KRB5_GET_KRBHST(3)

NAME

     krb5_get_krbhst, krb5_get_krb_admin_hst, krb5_get_krb_changepw_hst, krb5_get_krb524hst, krb5_free_krbhst -- lookup Kerberos KDC hosts

LIBRARY

     Kerberos 5 Library (libkrb5, -lkrb5)

SYNOPSIS

     #include <krb5.h>

     krb5_error_code
     krb5_get_krbhst(krb5_context context, const krb5_realm *realm, char ***hostlist);

     krb5_error_code
     krb5_get_krb_admin_hst(krb5_context context, const krb5_realm *realm, char ***hostlist);

     krb5_error_code
     krb5_get_krb_changepw_hst(krb5_context context, const krb5_realm *realm, char ***hostlist);

     krb5_error_code
     krb5_get_krb524hst(krb5_context context, const krb5_realm *realm, char ***hostlist);

     krb5_error_code
     krb5_free_krbhst(krb5_context context, char **hostlist);

DESCRIPTION

     These functions implement the old API to get a list of Kerberos hosts, and are thus similar to the krb5_krbhst_init() functions. However,
     since these functions returns all hosts in one go, they potentially have to do more lookups than necessary. These functions remain for com-
     patibility reasons.

     After a call to one of these functions, hostlist is a NULL terminated list of strings, pointing to the requested Kerberos hosts. These should
     be freed with krb5_free_krbhst() when done with.

EXAMPLES

     The following code will print the KDCs of the realm ``MY.REALM''.

	   char **hosts, **p;
	   krb5_get_krbhst(context, "MY.REALM", &hosts);
	   for(p = hosts; *p; p++)
	       printf("%s
", *p);
	   krb5_free_krbhst(context, hosts);

SEE ALSO

     krb5_krbhst_init(3)

HEIMDAL 
							  April 24, 2005							   HEIMDAL
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