I know there's a way to do it by putting the value in an array and assigning it that way. but i'm not sure how to do it efficiently. any ideas? i dont want to have to evoke two commands just to assign a variable. the two commands in this case being "echo" and "awk".
also, i'm hoping the proposed solutions can be used on all unix systems.
I know there's a way to do it by putting the value in an array and assigning it that way. but i'm not sure how to do it efficiently. any ideas? i dont want to have to evoke two commands just to assign a variable. the two commands in this case being "echo" and "awk".
also, i'm hoping the proposed solutions can be used on all unix systems.
The shell i will be using in most cases is:
Code:
/bin/sh
What OS are you using? /bin/sh varies considerably from system to system. (It is a 1980's vintage Bourne shell on some systems, a hard link or a symlink to a Korn shell on some systems, a hard link or symliink to bash on some systems, and there are lots of other possibilities on other systems.)
And, 4val is not a valid variable name (at least in Bourne, bash, and Korn shells where user defined shell variables start with an underscore or an alphabetic character; not a number).
I don't understand why you're using echo and awk to get the 2nd and 4th fields from constant strings. If the strings are constants, why not just use:
Code:
VAL2=3
VAL4=3
So, if you aren't processing constant strings, where are they coming from? Are they already stored in a shell variable? Are they from the 1st line of a file?
Arrays can't be used on all UNIX systems with /bin/sh, but we can probably come up with something portable and efficient if you give us a better description of where the data comes from and what you want to do with it.
Last edited by Scrutinizer; 09-06-2014 at 03:42 PM..
What OS are you using? /bin/sh varies considerably from system to system. (It is a 1980's vintage Bourne shell on some systems, a hard link or a symlink to a Korn shell on some systems, a hard link or symliink to bash on some systems, and there are lots of other possibilities on other systems.)
And, 4val is not a valid variable name (at least in Bourne, bash, and Korn shells where user defined shell variables start with an underscore or an alphabetic character; not a number).
I don't understand why you're using echo and awk to get the 2nd and 4th fields from constant strings. If the strings are constants, why not just use:
[CODE]VAL2=3[
VAL4=3/CODE]
So, if you aren't processing constant strings, where are they coming from? Are they already stored in a shell variable? Are they from the 1st line of a file?
Arrays can't be used on all UNIX systems with /bin/sh, but we can probably come up with something portable and efficient if you give us a better description of where the data comes from and what you want to do with it.
the os i'm working on varies, some are linux, aix, sunos, hpux.
the examples i gave, are really just examples.
so in the case of:
Code:
VAL4=$(echo "7 3 2 38 3")
please note, that the "7 3 2 38 3" are values from a different process which must be assigned. they are really not constants. they change.
looking for something like this that assigns by arrays?
Code:
NewVariable=${VAL4}[4]
this is just an example. im trying to grab whatever is in 4th field of another variable and assigninng it to a new variable?
yes. something like this. but how do u specify the delimiter if it is something other than space?
maybe awk can be used here? the goal here is to be able to do this without calling two commands.
If you're going to use /bin/sh on Solaris/SunOS systems, you have to restrict yourself to features available in a pure 1980s Bourne shell (no $(cmd) command substitution, no shell variable arrays, no ${var#pattern}, ${var##pattern}, ${var%pattern}, ${var%%pattern}, nor ${var:start:length} variable expansions, ...).
For what you have described you could use the following with any shell I've ever seen that would be installed as /bin/sh on any Linux or UNIX system:
Code:
set1="7 3 2 38 3"
set2="4:21:N:3"
for set in "$set1" "$set2"
do IFS=' :' read junk VAL2 junk VAL4 junk <<-EOF
$set
EOF
printf 'From set=\"%s\": VAL2=%s, VAL4=%s\n' "$set" "$VAL2" "$VAL4"
done
and would produce the output:
Code:
From set="7 3 2 38 3": VAL2=3, VAL4=38
From set="4:21:N:3": VAL2=21, VAL4=3
Note that the here-document in this script has two tab characters before the $set and one tab before the EOF. If you change the tab before the EOF to spaces this script will not work!
This User Gave Thanks to Don Cragun For This Post:
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09-06-2014
