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Full Discussion: Simple Variable substitution in ksh not working
Top Forums Shell Programming and Scripting Simple Variable substitution in ksh not working Post 302960994 by mukesh.lalwani on Monday 23rd of November 2015 01:55:19 AM
Old 11-23-2015
Simple Variable substitution in ksh not working
Hi Gurus,
Not able to catch what's going wrong here. I just want to get output as "tree".

Code:
server:/mk/app/nexapp $ echo $SHELL
/usr/bin/ksh
server:/mk/app/nexapp $ export db_name1="tree"
server:/mk/app/nexapp $ export i=1

1st try:
Code:
server:/mk/app/nexapp $ echo $(db_name$i)
ksh: db_name1:  not found.

2nd try:
Code:
server:/mk/app/nexapp $ echo $((db_name$i))
ksh: tree: 0403-009 The specified number is not valid for this command.

3rd try:
Code:
server:/mk/app/nexapp $ echo $(`(db_name$i)`)
ksh: db_name1:  not found.

Please help me understand why substitution is not working here. and what could be done to get the output as tree

---------- Post updated at 01:55 AM ---------- Previous update was at 01:17 AM ----------

variable substitution in ksh
Last edited by Don Cragun; 11-23-2015 at 03:12 AM.. Reason: Add CODE tags.
 

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LEARN ABOUT PLAN9

times

times(1)							   User Commands							  times(1)

NAME

       times - shell built-in function to report time usages of the current shell

SYNOPSIS

   sh
       times

   ksh
       times

DESCRIPTION

   sh
       Print the accumulated user and system times for processes run from the shell.

   ksh
       Print the accumulated user and system times for the shell and for processes run from the shell.

       On this man page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways:

       1.  Variable assignment lists preceding the command remain in effect when the command completes.

       2.  I/O redirections are processed after variable assignments.

       3.  Errors cause a script that contains them to abort.

       4.  Words,  following a command preceded by ** that are in the format of a variable assignment, are expanded with the same rules as a vari-
	   able assignment. This means that tilde substitution is performed after the = sign and word splitting and file name generation  are  not
	   performed.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       ksh(1), sh(1), time(1), attributes(5)

SunOS 5.10							    15 Apr 1994 							  times(1)
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