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Full Discussion: appending two strings
Top Forums Shell Programming and Scripting appending two strings Post 302326989 by badrimohanty on Friday 19th of June 2009 09:56:02 AM
Old 06-19-2009
appending two strings

Hi,

I have a small doubt. Here is the code snippet for which the output that I'm getting are a bit surprising.

testing.sh

#!/bin/sh
arg_1=$1
echo "arg passed by user is:${arg_1}"
mapping=`grep ${arg_1}= testing.conf | awk -F"=" '{print $2}'`
echo "mapping is $mapping"
key=param_file_$mapping
echo "key:${key}~"
param_file=`grep ${key}= testing.conf | awk -F"=" '{print $2}'`
echo "param file is:${param_file}"


testing.conf
ram=219
param_file_219=/home/testDir
ram_kumar=220
param_file_220=/home/testdir1


Now while running the shell script as ./testing.sh ram I am getting the following output
output
arg passed by user is:ram
mapping is 219
~eySmiliearam_file_219
param file is:


The lines in bold in the output are quite ambiguous.
The desired output should be

arg passed by user is:ram
mapping is 219
keySmiliearam_file_219~
param file is:/home/testDir

Could anyone please help me in finding where the bug is in the script?
 

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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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