How to use watch with a piped command?
I usually use watch Linux utility to watch the output of a command repeatedly every n seconds, like in watch df -h /some_volume/. But I seem not to be able to use watch with a piped series of command like:
How does the Watch Command in Linux work?
How does Linux Watch command work? 1 Once the job or command was successfully executed then it will print the “0” exit code. 2 Once the job or command failures then it will print the “1” exit code. 3 when the job or command forking the process to watch the failed then it will print the “2” exit code.
When to print exit code in Linux Watch?
1: Once the job or command failures then it will print the “1” exit code. 2: when the job or command forking the process to watch the failed then it will print the “2” exit code. 3: When it will replace the child process of stdout with write side pipe failed then it will print the “3” exit code.
How often do you execute the watch command?
watch [option(s)] command. When used without any of its few options, watch executes the specified command every two seconds. The command can include any options and arguments (i.e., file names or other input data) that would normally be used with it.
What can you do with the Watch Command in Linux?
Using Watch Command in Linux Watch is a great utility that automatically refreshes data. Some of the more common uses for this command involve monitoring system processes or logs, but it can be used in combination with pipes for more versatility.
How to watch the output of a command?
Commands with Pipes. If you want to execute a command that contains pipes you need to enclose the command in single or double quotes. If you don’t enclose the full command watch will run just the first command and then pipe its output to the next command in the pipeline. watch ‘COMMAND_1 | COMMAND_2’.