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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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echo(1B)					     SunOS/BSD Compatibility Package Commands						  echo(1B)

NAME
echo - echo arguments to standard output SYNOPSIS
/usr/ucb/echo [-n] [argument] DESCRIPTION
echo writes its arguments, separated by BLANKs and terminated by a NEWLINE, to the standard output. echo is useful for producing diagnostics in command files and for sending known data into a pipe, and for displaying the contents of envi- ronment variables. For example, you can use echo to determine how many subdirectories below the root directory (/) is your current directory, as follows: o echo your current-working-directory's full pathname o pipe the output through tr to translate the path's embedded slash-characters into space-characters o pipe that output through wc -w for a count of the names in your path. example% /usr/bin/echo "echo $PWD | tr '/' ' ' | wc -w" See tr(1) and wc(1) for their functionality. The shells csh(1), ksh(1), and sh(1), each have an echo built-in command, which, by default, will have precedence, and will be invoked if the user calls echo without a full pathname. /usr/ucb/echo and csh's echo() have an -n option, but do not understand back-slashed escape characters. sh's echo(), ksh's echo(), and /usr/bin/echo, on the other hand, understand the black-slashed escape characters, and ksh's echo() also understands a as the audible bell character; however, these commands do not have an -n option. OPTIONS
-n Do not add the NEWLINE to the output. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWscpu | +-----------------------------+-----------------------------+ SEE ALSO
csh(1), echo(1), ksh(1), sh(1), tr(1), wc(1), attributes(5) NOTES
The -n option is a transition aid for BSD applications, and may not be supported in future releases. SunOS 5.10 3 Aug 1994 echo(1B)
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