Solved

ksh variable expansion when reading from an external file.

Posted on 2004-04-20
3
738 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
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 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 50 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

Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Let's say you need to move the data of a file system from one partition to another. This generally involves dismounting the file system, backing it up to tapes, and restoring it to a new partition. You may also copy the file system from one place to…
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…
Learn how to get help with Linux/Unix bash shell commands. Use help to read help documents for built in bash shell commands.: Use man to interface with the online reference manuals for shell commands.: Use man to search man pages for unknown command…
Learn how to find files with the shell using the find and locate commands. Use locate to find a needle in a haystack.: With locate, check if the file still exists.: Use find to get the actual location of the file.:

751 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