What is a bash wait command?
Here you will find out:
- what a bash wait command is
- how to use wait in bash scripting
- when DiskInternals can help you
Are you ready? Let's read!
About a bash wait command
As the name implies, wait is a Linux command that waits until a running process is completed and returns an exit status. If multiple processes are running simultaneously, the wait command will only take note of the last process ID. In contrast, if the wait command is not linked with a job or process ID, it waits for all child processes to execute and return an exit status. The bash wait command is commonly used with process IDs or job IDs.
It is important to understand that the exit code of the wait command relies on the last known operand. When a process returns an exit code that is higher than 128, it means the process terminated unusually. The case is different when you get an exit code between 1 and 126. However, if the wait command is called without operands and all known job IDs have been executed, it exits with the value “0”. But when the last job ID is unknown, the wait command exits with the value 127.
Syntax and description of the bash wait command
The syntax of the bash wait command is:
Explanation:
Wait – the bash wait command
Pid – process ID (command ID)
Jobid – job ID (used to identify group background processes)
The wait command in the above syntax will wait for the identified process or job indicated by pid or jobid and report the termination status. But if pid is not specified, wait will simply wait for all currently active child processes and then return zero. Similarly, if jobid isn’t specified, the wait command will wait for all processes in the pipeline.
Examples of using wait in bash scripting
Here’s a comprehensive example of using the wait command in advanced bash scripting. The script below contains two processes, each having a unique pid. Now, the script is to run the processes in the background. The first command has a $process_id ($1). Also, the wait command is linked with the $process_id of the first command; thus, the second command will wait until the first command executes and return an exit code. “$?” is used to print the exit status of the wait command.
You can open Linux files in Windows easily
Opening Linux files on Windows is not feasible unless you use third-party software. DiskInternals Linux Reader is a professional software solution for Linux users. It allows Linux users to access their Linux files while operating in Windows. Also, this software works for virtual machine users. DiskInternals Linux Reader features a similar interface to that of Windows File Explorer, making it easier for anyone to view and access Linux partitions in Windows. If you’re operating a dual-boot PC, DiskInternals Linux Reader is your best option for third0party software that can allow you to open Linux files in Windows.
Related articles
- How to Access Linux Ext2 or Ext3 on Windows
- How to Access Ext4 from Windows
- How to Mount Ext4 on Windows for Free
- Mount Linux Drive on Windows for Free
- Bash Script: All You Need to Know
- An Algorithm: How to Create Bash While Loop
- Linux Shell: What You Need to Know at First
- How to Use Shell Script Sleep Command
- Bash: How to Check if the File Does Not Exist
- How to use bash get script directory in Linux
- 20 Examples of Bash Find Command
- Shell Script Cut: Basic You Need to Know
- Bash: How to Check if String Not Empty in Linux
- Linux: Sudo in Bash Scripts
- Linux: Bash Printf Examples
- Linux: Bash First Line
- Linux: A Bash Startup Script
- Linux: Write a Shell Script
- Shell Script: Replace String in File
- Bash and sh: is there any difference
- A Bash Dirname Command
- Linux: A Bash Source Command
- A Bash to Loop through Lines in File
- A Bash Nested Loop
- Use a Shell Script to Send an Email
- Using Bash to Write to a File
- About Bash Language
- Bash for Loop in One Line
- Learn about useful bash scripts
- About chaining bash commands
- About a bash export command
- Arch Linux install script
- About advanced bash scripting
- Learn about C shell script
- Learn about Korn shell scripting
- Using && in an IF statement in bash
- If you want to run shell script in background
- The disk you inserted was not readable by this computer error
- Learn about SFTP in bash scripting
- Copy command in shell scripts
- Install Oracle Database
- About a bash date command
- Guide in Pictures
- 5 Basic Shell Script Examples for Your First Script
- Bash Time Command on Linux
- How to Check Bash String Equality
- How to Use Linux Wait Command
- Bash: How to Loop Through Files in Directory
- Bash Cat Command in Examples
- Bash Script SSH: How to Use It
- Bash: A Script For User Input
- Linux ZSH: the basic you need to know
- Basic of Grep in Linux Shell Script
- Bash: how to split strings in Linux
- Hello World Script in Bash
- A Linux bin/bash Shell
- Linux: New Line in Shell Script
- Linux: Bash String Ends With
- Linux: $0 in a Shell Script
- A crontab service shell script
- A Bash Multiline Command
- Linux: A Bash Linter
- A Bash Test Command
- A Bash Status of Last Command
- Linux: A Bash Basename Command
- AWK in a Bash Script
- Learn about systemd startup script
- Learn about a bash error code
- Using a bash tee command
- To run a shell script in Dockerfile
- About a bash UNTIL loop
- Using /usr/bin/env command
- Whether bash waits for command to finish
- Using bash if 0
- Learn to run Perl script in Linux
- Examples of using the Expect
- Shell script usage
- Here is everything you need to know about Bash for Windows