Improve company productivity with a Business Account.Sign Up

x
?
Solved

ksh variable expansion when reading from an external file.

Posted on 2004-04-20
3
Medium Priority
?
765 Views
Last Modified: 2013-12-27
Hi,

   I think this is an easy question!  I've got a text file where I store information that I want to read into a ksh script.  For example, the text file has a line:
abcdef|-p ${NAME}

   In my ksh script, I have defined the NAME variable (NAME="temp") but when I parse the line from the text file as follows (line has been read into variable REC):
TEXT=$(echo $REC|awk '-F|' '{print $2}')
the resulting TEXT variable contains:
-p ${NAME}
instead of:
-p temp

  Is there a way to get this variable expansion to work properly?

Thanks

0
Comment
Question by:KAG99
  • 2
3 Comments
 
LVL 7

Expert Comment

by:fim32
ID: 10870235
hmm, i don't think ksh works that way...  unlike perl, there are no advanced q// options...
perhaps someone can correct me if i'm wrong?

the easiest way to do this, is to set your vars in your text file to some distinctive character string, like %%NAME%% (i've seen this one used)

and then after you've awked, sed the replacement:
TEXT=$(echo $REC|awk '-F|' '{print $2}'|sed -e "s/%%NAME%%/$NAME/")
0
 
LVL 3

Accepted Solution

by:
dtkerns earned 200 total points
ID: 10870973
you need to use eval to get ksh to do double substitution ... and an echo since eval needs to do something with the expresion

TEXT=`eval echo $(echo $REC|awk '-F|' '{print $2}')`
0
 
LVL 7

Expert Comment

by:fim32
ID: 10873119
ah, that pesky eval :P
0

Featured Post

Free Tool: Subnet Calculator

The subnet calculator helps you design networks by taking an IP address and network mask and returning information such as network, broadcast address, and host range.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

A metadevice consists of one or more devices (slices). It can be expanded by adding slices. Then, it can be grown to fill a larger space while the file system is in use. However, not all UNIX file systems (UFS) can be expanded this way. The conca…
I have been running these systems for a few years now and I am just very happy with them.   I just wanted to share the manual that I have created for upgrades and other things.  Oooh yes! FreeBSD makes me happy (as a server), no maintenance and I al…
Learn several ways to interact with files and get file information from the bash shell. ls lists the contents of a directory: Using the -a flag displays hidden files: Using the -l flag formats the output in a long list: The file command gives us mor…
Learn how to navigate the file tree with the shell. Use pwd to print the current working directory: Use ls to list a directory's contents: Use cd to change to a new directory: Use wildcards instead of typing out long directory names: Use ../ to move…

580 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question