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Variable equal to zero Linux 2.6.32-300.39.2.el

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# 1  
Old 11-25-2015
Variable equal to zero Linux 2.6.32-300.39.2.el
Code:
friends

as I can query for a variable that is zero, from a shell ??

# 2  
Old 11-25-2015
bash (and other bourne compatible shells): if [ -z $var ]; then ...; fi
This User Gave Thanks to RudiC For This Post:
tricampeon81
# 3  
Old 11-25-2015
To test is a variable is zero:

Code:
if [ $var -eq 0 ]; then ....

or, using a string comparison
Code:
if [ "$var" = 0 ]; then ....

To test if a variable contains an empty string (""), you can use RudiC's suggestion...
This User Gave Thanks to Scrutinizer For This Post:
tricampeon81
# 4  
Old 11-25-2015
Quote:
Originally Posted by Scrutinizer
To test is a variable is zero:

Code:
if [ $var -eq 0 ]; then ....

or, using a string comparison
Code:
if [ "$var" = 0 ]; then ....

To test if a variable contains an empty string (""), you can use RudiC's suggestion...

thank you !!!!
Use this option without problem


Code:
if [ $var -eq 0 ]; then ....

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