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
~eyaram_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
key
aram_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)