What wrong with this command in BASH

[Bird222]

First, I'm a newb so keep that in mind. 🙂 This is on my tomato router.

This seems to work

if [ $(expr $(expr $(expr $curDate - $fileDateTor) + 43200) / 86400 ) -ge 5 ]; then

However this doesn't

if $(( (($curDate - $fileDateTor + 43200) / 86400 ) >= 5 )); then

Any idea why?

 

[Jodell88]

Lack of square brackets.

 

[Bird222]

Lack of square brackets.

You mean like this?

if [ $(( (($curDate - $fileDateTor + 43200) / 86400 ) >= 5 )) ]; then

 

[Jodell88]

You mean like this?

if [ $(( (($curDate - $fileDateTor + 43200) / 86400 ) >= 5 )) ]; then

Yes, granted I have no real experience with BASH, but it does use square brackets for its conditionals.

 

[Bird222]

You mean like this?

if [ $(( (($curDate - $fileDateTor + 43200) / 86400 ) >= 5 )) ]; then

Yes, granted I have no real experience with BASH, but it does use square brackets for its conditionals.

FYI, it needs to be like this

if [ $(( (($curDate - $fileDateTor + 43200) / 86400 ) )) -ge 5 ]; then

Thanks for the hint.

 

[Ken g6]

"[]" is short for the "test" command. So if you want to learn more about BASH conditionals, try `man test`.

 

[mv2devnull]

http://mywiki.wooledge.org/BashFAQ has IMO interesting snippets.
For example: http://mywiki.wooledge.org/BashFAQ/031