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I want to keep an eye on a file as it is created. So I used this command

ls -hal ./file |awk '{print $5}'

which gives the size of the file I am looking for. I use awk because I don't need other stuff, just the file size.

But I'm unable to use this with watch command, because if I try

watch ls -hal ./file |awk '{print $5}'

then watch only accepts ls -hal ./file and then pipes it to awk, giving no output.

If I try

watch "ls -hal ./file |awk '{print $5}'"

then it gets weird showing wrong command and whole output.

Every 2.0s: ls -hal ./file |awk '{print }'              Sun Jul 20 15:52:18 2014

-rw-rw---- 1 aditya aditya 1.7K Jul 20 15:52 ./file

You can see there is no $5 in the awk command.

Further quoting creates various similar errors.

So what is the right way to quote this command?

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2 Answers 2

up vote 4 down vote accepted

One option would be to escape the $ in your awk expression

watch "ls -hal ./file |awk '{print \$5}'"

Alternatively, you could avoid the issue altogether by using stat instead of parsing the output of ls

watch stat -c '%s' ./file
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@RegisteredUser I recommend to accept this (steeldriver's) answer instead of mine because it gives right solution for awk and also sort syntax by stat! –  Pandya Jul 20 at 11:02

Use following command :

watch 'ls -hal ./file|cut -d " " -f 5'

And if you want to highlight difference than,

watch -d 'ls -hal ./file|cut -d " " -f 5'

This will give work as you want!

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