When wait command is executed with $process_id then the next command will wait for completing the task of the first echo command. It waits till all commands are completed, i.e.
’ is used to read the status value of wait command. exits with status 0) that you need to chain it to the next command with the && logical operator The background process will run as normal unless it attempts to read from the console, in which case it will … When running a batch file, each command does not seem to wait until a previous command has finished.
The second wait command is used with ‘ $! ’ and this indicate the process id of the last running process. ‘ $? Unless you explicitly put a command into the background (using a single & character), the shell will wait for it to complete before execution proceeds to the next command It's only if you want to ensure that a command completes successfully (i.e. To prevent our script from exiting, we use the wait command. Hope this helps. For example: Given the following code snippet, the test to see if DEST.DOC exists must not run until after the COPY command … Bash normally waits for a process to complete before starting another. In this case, the process begins execution in the background, and you immediately get another bash prompt, allowing you to do more work. Forcing wait-to-finish for each command in batch files. You can override this behavior by appending an ampersand to the command line: command &. Note, you can use wait in interactive shells as well. However in a bash script, we likely don’t want our script to finish executing until the forked processes are complete. "wait" waits for all background jobs to complete. Sample: sleep 30 & sleep 40 & sleep 120 & wait. at least 120 seconds for this example.
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