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assign awk command result to a variable

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# 1  
Old 01-22-2009
Question assign awk command result to a variable
Code:
#!/bin/sh
#
##
MYSTRING = `awk '/myApp.app/' /Users/$USER/Library/Preferences/loginwindow.plist`
if [$MYSTRING = ""]
then
echo String not found
defaults write /Users/$USER/Library/Preferences/loginwindow AutoLaunchedApplicationDictionary -dict-add -string Hide -bool YES -string Path -string '/Applications/myApp.app'
else
echo String found
fi

Always result "String found". What is problem? Thanks.
# 2  
Old 01-22-2009
Remove all the spaces around the equal signs (=) in the assign statements in your script.

Regards
Last edited by Franklin52; 01-22-2009 at 07:47 AM..
# 3  
Old 01-22-2009
Check if it is empty or not by including
Code:
...
echo "${MYSTRING}"
...

If it looks empty but is still not recognized, use maybe something like
Code:
...
echo "${MYSTRING}" > tmpfile
...

Then check afterwards with
Code:
od -c < tmpfile

if it is really empty.

Also you can try to use following test instead comparing to "":
Code:
...
if [[ -z ${MYSTRING} ]]; then
...

# 4  
Old 01-22-2009
And as I just see Franklin's post, insert a blank between the square bracket and the inner characters like:

Code:
if [ $MYSTRING = "" ]
    ^              ^

# 5  
Old 01-22-2009
Code:
#!/bin/sh
#
##
MYSTRING="www"
TEMP="qqq"
echo ${MYSTRING}
echo ${TEMP}
if [ "${MYSTRING}"="${TEMP}" ];
then
echo String equal
else
echo String not equal
fi

Result "String equal". What is not correct? Thanks SmilieSmilie
# 6  
Old 01-22-2009
Code:
if [ "${MYSTRING}" = "${TEMP}" ];
                  ^ ^

Need blanks there.
Last edited by zaxxon; 01-22-2009 at 08:27 AM.. Reason: typo
# 7  
Old 01-22-2009
This is correct (compare two string):
Code:
#!/bin/sh
#
##
MYSTRING="www"
TEMP="qqq"
echo ${MYSTRING}
echo ${TEMP}
if [ "${MYSTRING}" = "${TEMP}" ];
then
echo String equal
else
echo String not equal
fi

First code edit:
Code:
#!/bin/sh
#
##
MYSTRING=`awk '/myApp.app/' /Users/$USER/Library/Preferences/loginwindow.plist`
if [ "${MYSTRING}"  =  "" ];
then
echo String not found
defaults write /Users/$USER/Library/Preferences/loginwindow AutoLaunchedApplicationDictionary -dict-add -string Hide -bool YES -string Path -string '/Applications/myApp.app'
else
echo String found
fi

SmilieGood WorkSmilie
Thanks
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