Simple question about sed or awk

setianusa · 09-16-2005, 02:05 PM

Hi,

I have a variable which may have a value like this :
i=$(echo "-pabc.par -sXYZ:123 -cZZ")
or like this :
i=$(echo "-sXYZ:123")
or like this :
i=$(echo "") # empty, or null

From that $i variable, I would like to generate 3 variables, $P, $S, and $C
In the first case :
$P=abc.par
$S=XYZ:123
$C=ZZ

In the second one
$S=XYZ:123
$P and $C are null or empty

And in the third one all 3 variables are empty or null.

How can I do this using sed or awk ?

Thanks for any help.

druuna · 09-16-2005, 03:28 PM

Hi,

Does this have to be done with sed or awk?

This does what you want, but no sed or awk is used:

Code:

#!/bin/bash

# test string used:
i="-pabc.par -sXYZ:123 -cZZ"

# start with nullified variables
P=""
S=""
S=""

# parse contents of i one at the time (if any):
for THIS in ${i}
do
  # check to see if first 2 characters match.
  case ${THIS} in
    -p*) P=${THIS:2} ;; # a match on -p , remove first 2 characters
    -s*) S=${THIS:2} ;;
    -c*) C=${THIS:2} ;;
  esac
done

# print variables:
echo "P: ${P}"
echo "S: ${S}"
echo "C: ${C}"

exit 0

A sed or awk solution is probably possible, but this seems to be one of the simpler ways of doing it (my 2c, that is

).

Anyway, hope this helps.

setianusa · 09-16-2005, 03:57 PM

Thanks a lot druuna !