Concatenating strings in Shell

Question

I am facing this issue when concatenating strings Linux shell script

apphome="`cd \`dirname $0\` && pwd && cd - >/dev/null`"
echo "***************** APP Home***************"
echo $apphome
libdir="${apphome}/lib"
echo "**********Lib  DIR ***********************"
echo ${libdir}

echo $apphome and echo $libdir gives following output

***************** APP Home***************
/product/abc/project1/cba/STADATA
**********Lib  DIR ***********************
/libduct/abc/project1/cba/STADATA

why don't it append /lib to the libdir correctly, could anybody explain me what is going wrong here

Copy just that bit you posted into its own file and run it directly using sh or bash. You're introducing error somewhere that you're not posting. — tylerl
– tylerl, Commented Oct 31, 2012 at 7:03
Somehow, $apphome ends with a carriage return. Are you using a Windows shell? — glenn jackman
– glenn jackman, Commented Oct 31, 2012 at 10:57
$() nests, backticks do not. Use: $( cd $( dirname $0 ) && pwd ) ( no need to cd back, it's a subshell) or $( dirname $( readlink -f $0 )). Backticks are evil. — William Pursell
– William Pursell, Commented Oct 31, 2012 at 12:38

Matteo · Accepted Answer · 2012-10-31 06:42:08Z

2

Just quote the string

libdir="${apphome}/lib"

Complete script

#!/bin/sh
apphome="`cd \`dirname $0\` && pwd && cd - >/dev/null`"
echo "***************** APP Home***************"
echo $apphome
libdir="${apphome}/lib"
echo "**********Lib  DIR ***********************"
echo ${libdir}

gives

***************** APP Home***************
/product/abc/project1/cba/STADATA
**********Lib  DIR ***********************
/product/abc/project1/cba/STADATA/lib

answered Oct 31, 2012 at 6:42

Matteo

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8 Comments

Matteo Over a year ago

Ok which shell are you using? How is the script executed?

MeaCulpa Over a year ago

If it keeps failing you I suggest printf which is bullet-proof :)

KItis Over a year ago

i have tried executing script as sh scriptname.sh and ./scriptname.sh both gives same error. How can I know which shell I am using.

cdarke Over a year ago

Run the script as follows bash -x ./scriptname.sh. That will give you a trace of what it is doing, which should lead to a solution.

user1026870 Over a year ago

Glenn Jackman's comment is the best hint

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