bash syntax problems

hashbangbinbash · 04-15-2008, 06:41 AM

I have a similar question about the correct syntax for this scriptlet:

Code:

#!/bin/bash
n=( date | awk '{print $3 }')
if ($n =< 7)
 echo "do the thing"
done.

can't quite find the answer through google.

pixellany · 04-15-2008, 06:53 AM

Quote:

Originally Posted by hashbangbinbash

I have a similar question about the correct syntax for this scriptlet:

Code:

#!/bin/bash
n=( date | awk '{print $3 }')
if ($n =< 7)
 echo "do the thing"
done.

can't quite find the answer through google.

How is this similar to the OP asking about ping??!! (It's better to put into your own thread)

What is the question?
One thing I see is the assignment of the result of a command. It needs to be one of 2 forms:
n=$(command)
n=`command`
(those are back-tics, not single quotes)

hashbangbinbash · 04-15-2008, 07:04 AM

Quote:

Originally Posted by pixellany

How is this similar to the OP asking about ping??!! (It's better to put into your own thread)

What is the question?
One thing I see is the assignment of the result of a command. It needs to be one of 2 forms:
n=$(command)
n=`command`
(those are back-tics, not single quotes)

it's a question about bash scripting where a condition is tested and a command results from that condition. Is there any diffefrence with back-ticks and "$()"?

pixellany · 04-15-2008, 07:30 AM

Quote:

Originally Posted by hashbangbinbash

it's a question about bash scripting where a condition is tested and a command results from that condition. Is there any difference with back-ticks and "$()"?

Why not try it?

(No, they do exactly the same thing)

jschiwal · 04-15-2008, 08:03 AM

Quote:

Originally Posted by hashbangbinbash

it's a question about bash scripting where a condition is tested and a command results from that condition. Is there any diffefrence with back-ticks and "$()"?

You can have an expression with $() inside another expression in $().