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Full Discussion: ksh - Get last character from string - Bad Substitution error
Top Forums Shell Programming and Scripting ksh - Get last character from string - Bad Substitution error Post 302899941 by ysrini on Friday 2nd of May 2014 01:53:42 PM
Old 05-02-2014
ksh - Get last character from string - Bad Substitution error
I want to get the last character from my machine name using the following code, the default shell is bash, the script runs in ksh.
I get 'bad' substitution error on running the script, but works fine if run using dot and space.

Why?

Code:
[ysrini@linuxapp01a bin]$ echo $0
bash

[ysrini@linuxapp01a bin]$ cat -n myenv.sh 
     1  #!/usr/bin/ksh
     2
     3  export SERVER_NAME=`hostname`
     4  echo "SERVER_NAME : ${SERVER_NAME}"
     5
     6  export SERVER_NODE=`echo ${SERVER_NAME:${#SERVER_NAME} - 1}`
     7  echo "SERVER_NODE : ${SERVER_NODE}"
     8
     9  export SERVER_ROOT_NAME=`echo "${SERVER_NAME%?}"`
    10  echo "SERVER_ROOT_NAME : ${SERVER_ROOT_NAME}"


[ysrini@linuxapp01a bin]$ myenv.sh 
SERVER_NAME : linuxapp01a
./myenv.sh[6]: : bad substitution
SERVER_NODE : 
SERVER_ROOT_NAME : linuxapp01

[ysrini@linuxapp01a bin]$ . myenv.sh 
SERVER_NAME : linuxapp01a
SERVER_NODE : a
SERVER_ROOT_NAME : linuxapp01

 

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LEARN ABOUT PHP

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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