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String generation from user input

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# 8  
Old 10-03-2012
Thanks a lot for that, workes great when I try it out. However, I have some troubles invoking it in my script.

I have the following:

Code:
read -p "  Blades?: " blades

blstr=seq 1 14|paste -s|cut -f "$blades"|tr '\t' ' '
hsgen="sh hostgen $blstr > hfil"
eval $hsgen

I guess I need an eval command or similar somewhere?

I'm a newbie on this. Learning, but not at the speed I had hoped...

Tobbe
# 9  
Old 10-03-2012
First, the variable blstr is not assigned the desired result unless you use "command substitution", i.e. $(seq ... ). Then, why do you use the hsgen variable at all instead of issuing the command itself? Third, $hsgen will execute by itself except for the redirection; if you want that, use eval $hsgen.
This User Gave Thanks to RudiC For This Post:
Tobbev
# 10  
Old 10-03-2012
Some systems (such as Solaris 10 and 11) have neither jot nor seq utilities. If you want to stay in awk rather than use jot, perl, or seq the following will work:
Code:
#!/bin/ksh
printf "%s\n" "1-3,6,7,9-11" "101-105,1000,10010-10013" | awk -F, '{
    no = 0 # number of values output for this input line
    # Loop through comma separated input fields.
    for(i = 1; i <= NF; i++) {
        n = split($i, range, "-")
        # Loop through the dash separated range.
        # Note that if there is no dash in $i, range[1] == range[n].
        for(j=range[1]; j<=range[n]; printf("%s%d", no++ ? " " : "", j++));
    }
    printf("\n")
}'

With the two lines of input I gave it, it produces the following output:
Code:
1 2 3 6 7 9 10 11
101 102 103 104 105 1000 10010 10011 10012 10013

# 11  
Old 10-03-2012
Rudic, thanks a million.

The reason for using the hsgen part like it is, is that I need redirection to a file.

Thanks again!

Tobbe

---------- Post updated at 06:32 AM ---------- Previous update was at 06:30 AM ----------

Don Cragun, I'm on Suse Enterprise, so seq works fine. Thanks for the effort though, awk is amazingly powerful.

Tobbe
# 12  
Old 10-03-2012
I think what RudiC was asking was: Why are you using:
Code:
hsgen="sh hostgen $blstr > hfil"
eval $hsgen

instead of: hostgen $blstr > hfil?
# 13  
Old 10-03-2012
bash version (space separated list, use IFS=, read ... for comma separated):
Code:
while read -p "  Blades?: " -a blades
do
  for b in "${blades[@]}"
  do
    for ((i=${b%%-*}; i<=${b##*-}; i++))
    do 
      printf "%s" "$i "
    done  
  done
  echo
done

# 14  
Old 10-03-2012
Quote:
Originally Posted by alister
Simplifying Ygor's inspired approach:
Code:
seq -s ' ' 14 | cut -d ' ' -f "$n"

Quote:
Originally Posted by Don Cragun
Some systems (such as Solaris 10 and 11) have neither jot nor seq utilities.
One possible approach that's POSIX-blessed and does not use sh nor awk (for fun):
Code:
bc <<EOBC | paste -sd ' ' | cut -d ' ' -f $n
    while (x < 14) ++x
EOBC

Regards,
Alister
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