You might be able to merge something like this into your code:
Code:
#!/bin/ksh
BASESLOT=4096
ConfigDir='/path/used/to/store/TapeSlotFile'
IAm=${0##*/}
TapeSlotFile="$ConfigDir/${IAm}_slot"
if [ ! -r "$TapeSlotFile" ]
then printf '%s: Warning: Configuration file (%s) Not found.\n\t%s\n' \
"$IAm" "$TapeSlotFile" 'It is being created now.' >&2
TAPE=0
if ! echo "$TAPE" > "$TapeSlotFile"
then printf "%s: Error: Can't create tape slot file.\n\t%s\n" \
"$IAm" 'Terminating.' >&2
exit 1
fi
# The following line is not needed if only root will run this script.
chmod 664 "$TapeSlotFile"
else read TAPE < "$TapeSlotFile"
TAPE=$(((TAPE + 1) % 23))
if ! echo "$TAPE" > "$TapeSlotFile"
then printf "%s: Error: Can't update tape slot file (%s).\n\t%s\n" \
"$IAm" "$TapeSlotFile" 'Terminating.' >&2
exit 2
fi
fi
SLOT=$((BASESLOT + TAPE))
printf 'Assigned tape slot: %d\n' "$SLOT"
Note that it is using $TAPE values 0 through 22 to select from $SLOT values 4096 through 4118. I'm sure you can make adjustments if the assigned slot range is off. You definitely need to set the ConfigDir variable (on the line shown in red in the script) to the name of a directory where anyone who should be running this script has permission to create files. And, if the users running the script don't all have the same user ID (such as root), they need to at least run with the same group ID.
This User Gave Thanks to Don Cragun For This Post:
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Thanks button at the lower left corner of that post is one way to convey your thanks.