KSH script with a test on a NULL

[kozlow]

This works on my AIX systems but not my HP-UX

#!/bin/ksh
while read TBS
do
if ! [ $TBS ]
then
echo No Tablespace to process
continue
else
echo $TBS
fi
done < tbs

The tbs file contains sql output of all the tablespaces in my oracle database. The problem is that there is some blank lines in the file. I am tring to read the file, without processing any blank lines....

It will run if I remove the #!/bin/ksh

Error Received:
!: not found

Any ideas??????

 

[LKBrwnDBA]

Replace

if ! [ $TBS ]

with

if [ -z $TBS ]




----------------------------------------------------------------------------
The person who says it can't be done should not interrupt the person doing it. -- Chinese proverb

 

[guggach]

LKBrwnDBA is correct, but
- while already do the test,
it will break as soon TBS is empty
- the else (after a continue in 'if') is unused.
considere:
if [ xxx ]
then ... ; continue
fi
do-something

- so your code should be:
while read TBS
do echo $TBS
done < tbs



guggach

 

[kozlow]

LKBrwnDBA....

Since the variable is Null, I recieve error:
./tst[4]: test: argument expected

guggach... The file I read has null lines in the begining and such.... I am not tring to continue at EOF....

Will Continue to look around....

 

[Ygor]

Try using grep and quoting the variable...

#!/bin/ksh
grep . tbs | while read TBS
do
        if [ -z "$TBS" ]
        then
                 :
        fi
done

 

[vinky]

Try,

if [[ -z "$TBS" ]]