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# 8  
Old 02-21-2012
Quote:
Originally Posted by goddevil
I have changed my shebang to #!/usr/bin/bash and this only increases the errors that i get. I still get the output that i require though



I am trying to see if VAR1 consists of the string 63u and if it does, then execute the statements under if
2 things are wrong -
1. You are missing a double quote in your expression (echo $VAR1")
2. Your test expression can't just be the output of the grep command - you need to perform some kind of test operation on it.

Try the following (using $() syntax instead of the deprecated backticks):

Code:
if [[ -n "$(echo "$VAR1" | grep 63u)" ]]

This User Gave Thanks to mobitron For This Post:
goddevil
# 9  
Old 02-21-2012
Code:
VAR1="hostname63uf.group"
if [[ "$var1" =~ /63u/ ]]
then
        SUB1="yes"
        SUB2="23421"
else
        SUB1="no"          
fi

if [ "$SUB1" == "no" ]
then
        SUB2="48421"
else
        SUB2="47615"
fi
echo $SUB1 $SUB2

This User Gave Thanks to balajesuri For This Post:
goddevil
# 10  
Old 02-21-2012
Thanks a mil for the replies everyone. I modified my code and the below code works as expected

Code:
VAR1="hostname63uf.group"
if [[ `echo "$VAR1" |grep 63u` ]]
then
        SUB1="yes"
        SUB2="23421"
else
        SUB1="no"          
fi
if [ "$SUB1" == "no" ]
then
        SUB2="48421"
else
        SUB2="47615"
fi
echo $SUB1 $SUB2

# 11  
Old 02-21-2012
Quote:
Originally Posted by mobitron
Your test expression can't just be the output of the grep command - you need to perform some kind of test operation on it.

Try the following (using $() syntax instead of the deprecated backticks):

Code:
if [[ -n "$(echo "$VAR1" | grep 63u)" ]]

You're mistaken. You can indeed just test the result of a command subsitution or any shell expansion by itself. [[ -n "..." ]] and [[ "..." ]] are synonymous.

Regards,
Alister
These 2 Users Gave Thanks to alister For This Post:
goddevil mobitron
# 12  
Old 02-21-2012
Quote:
Originally Posted by alister
You're mistaken. You can indeed just test the result of a command subsitution or any shell expansion by itself. [[ -n "..." ]] and [[ "..." ]] are synonymous.

Regards,
Alister
I was indeed mistaken. Thanks for putting me straight!
# 13  
Old 02-21-2012
Quote:
Originally Posted by goddevil
Thanks a mil for the replies everyone. I modified my code and the below code works as expected

Code:
if [[ `echo "$VAR1" |grep 63u` ]]
then

Congratulations on getting it working. In case you're interested, here's a more direct way of accomplishing that task:
Code:
if echo "$VAR1" | grep -q 63u
then

If for some reason your grep does not support -q:
Code:
if echo "$VAR1" | grep 63u >/dev/null
then

Regards,
Alister
# 14  
Old 02-21-2012
Quote:
Originally Posted by alister
Congratulations on getting it working. In case you're interested, here's a more direct way of accomplishing that task:
Code:
if echo "$VAR1" | grep -q 63u
then

If for some reason your grep does not support -q:
Code:
if echo "$VAR1" | grep 63u >/dev/null
then

Regards,
Alister
Thanks Alister. I did not know that you could do away with the [] braces. So in effect what i've been doing is tantamount to using a double negative speech.

Code:
if echo "$VAR1" | grep 63u >/dev/null

worked a charm

The grep does not support -q and i get the following :
Quote:
grep: illegal option -- q
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