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Using sed and if multiple conditions

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Top Forums Shell Programming and Scripting Using sed and if multiple conditions
# 1  
Old 07-19-2014
Using sed and if multiple conditions
Hi

I've been trying to get this to work but so far no luck.
Code:
    #!/usr/bin/ksh

unset EXP
APP=$1
EXP=`sed -n "/${APP}/p" tIclrpt.out |awk '{print $7}'|sed '/^$/d'`
EXT=`sed -n "/${i}/p" ${SESLOG} |awk '{print $4}'|grep "${i}"`
EXEM=/path/to/fail
ACTI=/path/to/success

if [ -z $EXP ] || [ -z $EXP = none ]
then
echo " this has a value"
echo " EXP Value is: ${EXP} "
echo "${APP}" >> $ACTI
else
echo "${APP}" >> $EXEM
fi


I need 1 of the two conditions met to log the application into a log that can be used to recycle the application at a later time.

Sometimes when you query this app, it will display one of two characters with that sed i used.
1. output is "none"
2. output is blank


In a test, just to echo if it's working or not, it always see's the blank line as a value.
if I do it this way with the application of value = none
Code:
if [ -z $EXP ] || [ -z $EXP = none ]

It works the way it should.

But if the value is blank i get this:

Code:
exp3.ksh[6]: test: argument expected
 this has a value
 EXP Value is:

# 2  
Old 07-19-2014
Code:
if [ -z "$EXP" ] || [ "$EXP" = "none" ]
then

This User Gave Thanks to MadeInGermany For This Post:
techy1
# 3  
Old 07-19-2014
Quote:
Originally Posted by MadeInGermany
Code:
if [ -z "$EXP" ] || [ "$EXP" = "none" ]
then

hey thanks! actually figured it out when i took a break lol... over thinking it too much. It was actually supposed to be:

Code:
if [ -z "$EXP" -o "$EXP" = "none" ]

# 4  
Old 07-19-2014
Note: -o works too, but it has been marked obsolescent, and therefore MadeInGermany's suggestion is the preferred approach.

See Test: Application Usage
# 5  
Old 07-19-2014
Really? I think -o within [ ] (test) is quite okay. Perhaps you mean the [[ ]] compound that has || for "or".
# 6  
Old 07-19-2014
No I mean the standard test.
Quote:
The XSI extensions specifying the -a and -o binary primaries and the '(' and ')' operators have been marked obsolescent. (Many expressions using them are ambiguously defined by the grammar depending on the specific expressions being evaluated.) Scripts using these expressions should be converted to the forms given below. Even though many implementations will continue to support these obsolescent forms, scripts should be extremely careful when dealing with user-supplied input that could be confused with these and other primaries and operators. Unless the application developer knows all the cases that produce input to the script .....
Test: Application Usage
This User Gave Thanks to Scrutinizer For This Post:
MadeInGermany
# 7  
Old 07-19-2014
Interesting - this would break thousands of old scripts.
In old times test and even [ were an external command; -a and -o were most efficient.

IMHO they should leave it alone and recommend the [[ ]] instead.
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