Shellscript action if two files are different

bash shell scp

if ! cmp test.py test.py~ >/dev/null 2>&1then  # restart servicefi

Breaking that down:

cmp test.py test.py~ returns true (0) if test.py and test.py~ are identical, else false (1). You can see this in man cmp.
! inverts that result, so the if statement translates to "if test.py and test.py~ are different".
The redirects >/dev/null 2>&1 send all output of cmp to null device, so you just get the true/false comparison result, without any unwanted noise on the console.

bash shell scp

You could diff() the two files. A return code of zero (0) means there are no differences. A return code of one (1) says the files differ.

bash shell scp

I'd do something like

zumodo@shold$ cat /test/test/test/server.py | ssh zumodo@otherhost 'cat - > /test/test/test/test.py.new ; cmp /test/test/test/test.py /test/test/test/test.py.new || (mv /test/test/test/test.py.new /test/test/test/test.py ; echo issue restart command here)'

CodeHunter

Shellscript action if two files are different

Recent Posts

How can I color dots in a xy scatterplot according to column value?

How to update a claim in ASP.NET Identity?

What does {0} mean when initializing an object?

Accessing members of items in a JSONArray with Java

How to log SQL statements in Spring Boot?

Powershell Get-WebSite name parameter is ignored

How to detect scroll to bottom of html element

Java synchronized method

How to test controllers with CodeIgniter?

Detect Visual Composer

Matplotlib: Specify format of floats for tick labels

Rails join a list of strings with commas and "and" before the last