Error : Shell script returns unary operator is expected error message

Question

i am fixing a given shell script and i am getting following error message

line 322: [: ==: unary operator expected

this error is returned from this line.

 if [ $4 == "managed?.out" ];then

could someone explain me what makes this error

Also could someone explain what is the purpose of using ? in the"managed?.out"

thanks in advance for any help

codaddict · Accepted Answer · 2012-05-03 08:56:30Z

5

You need to quote $4:

if [ "$4" == "managed?.out" ];then

answered May 3, 2012 at 8:56

codaddict

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2 Comments

H_7 Over a year ago

Could you explain why exactly you need to do this? @codaddict

Hengjie Over a year ago

Yes, I'd be interested in the answer to @H_7's question as well.

Raphael Roth · Accepted Answer · 2012-05-03 09:06:17Z

1

change the if statement to

if [ "$4" == "managed?.out" ];then

The double-quotes are only necessary as you use $4, if your variable would be $string, you would not need them.

should "?" be interpreted as a bash-wildcard? if yes, you need to use

if [[ "$4" == managed?.out ]];then

answered May 3, 2012 at 9:06

Raphael Roth

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Comments

chemila · Accepted Answer · 2012-05-03 09:18:46Z

0

try:

if [[ $4 == "managed?.out" ]];then

answered May 3, 2012 at 9:18

chemila

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1 Comment

KItis Over a year ago

this is a separate question. what is the purpose of using ? sign in the managed?.out text.

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