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What is Pipestatus?
PIPESTATUS. An array variable (see Arrays below) containing a list of exit status values from the processes in the most-recently-executed foreground pipeline (which may contain only a single command).
What is the $@ variable?
The variable $@ is all parameters $1 .. whatever . The variable $* , is similar, but does not preserve any whitespace, and quoting, so “File with spaces” becomes “File” “with” “spaces”. This is similar to the echo stuff we looked at in A First Script. As a general rule, use $@ and avoid $* .
What is Unix Pipestatus?
There is an internal Bash variable called $PIPESTATUS ; it’s an array that holds the exit status of each command in your last foreground pipeline of commands. | tee out.txt ; test ${PIPESTATUS[0]} -eq 0.
Why does pipestatus [ ] change all the time?
Because $ {PIPESTATUS []} is a special variable, it changes all the time. However, we can copy this array into another array, which is just a regular array, which will not be changed at all just by running some more commands. Copying an array requires a slightly different syntax to simply copying contents of a variable into another:
How to check the exit status of a pipeline?
Checking the exit status of ANY command in a pipeline It’s a pretty common thing in a shell script to want to check the exit status of the previous command. You can do this with the $? variable, as is widely known: #!/bin/bash grep some.machine.example.com /etc/hosts if [ “$?”
How to prevent Jenkins from interpreting the pipelinestatus [ 0 ] as a variable?
The docker ps -a | grep $APP_CONTAINER_NAME command is returning non-zero when the container was not correctly built/tested, hence the || true. How can I prevent Jenkins from interpreting the $ {PIPELINESTATUS [0]} as a variable replacement in the script?
How to check the exit status of any command?
So, to see what grep found, we can write our script like this: The downside is, that any command you use to access $ {PIPESTATUS []}, will automatically replace the current state of the array with the return code of the command you have just run: grep | tee