Run a batch file
- From the start menu: START > RUN c:path_to_scriptsmy_script.cmd, OK.
- "c:path to scriptsmy script.cmd"
- Open a new CMD prompt by choosing START > RUN cmd, OK.
- From the command line, enter the name of the script and press return.
- It is also possible to run batch scripts with the old (Windows 95 style) .
How to write a script – the steps:
- You start with an idea.
- Pre-write.
- Build your world.
- Set your characters, conflict, and relationships.
- Write – synopsis, treatment, and then the script itself.
- Write in format.
- Rewrite.
- Submit!
Steps to write and execute a script
- Open the terminal. Go to the directory where you want to create your script.
- Create a file with . sh extension.
- Write the script in the file using an editor.
- Make the script executable with command chmod +x <fileName>.
- Run the script using ./<fileName>.
Bash is a command processor that typically runs in a text window where the user types commands that cause actions. Bash can also read and execute commands from a file, called a shell script.
How to Write Shell Script in Linux/Unix
- Create a file using a vi editor(or any other editor). Name script file with extension . sh.
- Start the script with #! /bin/sh.
- Write some code.
- Save the script file as filename.sh.
- For executing the script type bash filename.sh.
Bash stands for "Bourne Again SHell", and is a replacement/improvement of the original Bourne shell ( sh ). Shell scripting is scripting in any shell, whereas Bash scripting is scripting specifically for Bash.
xargs will run the first two commands in parallel, and then whenever one of them terminates, it will start another one, until the entire job is done.
The semicolon (;) operator allows you to execute multiple commands in succession, regardless of whether each previous command succeeds. For example, open a Terminal window (Ctrl+Alt+T in Ubuntu and Linux Mint). Then, type the following three commands on one line, separated by semicolons, and press Enter.
Is it possible to run two commands at the same time in a shell script , Yes, it is. If you want to do two things concurrently, and wait for them both to complete, you can do something like: sh ./stay/get_it_ios.sh & PIDIOS=$! sh . The first three commands wget commands will be executed in parallel.
In shell, when you see $ command one && command two. the intent is to execute the command that follows the && only if the first command is successful. This is idiomatic of Posix shells, and not only found in Bash. It intends to prevent the running of the second process if the first fails.
Run multiples commands by using & between the commands. It's will execute the commands in background. It can be done with simple Makefile: sleep%: sleep $(subst sleep,,$@) @echo $@ done.
In case you need to execute several processes in batches, or in chunks, you can use the shell builtin command called "wait". See below. The first three commands wget commands will be executed in parallel. "wait" will make the script wait till those 3 gets finished.
Small. Alpine Linux is built around musl libc and busybox. This makes it smaller and more resource efficient than traditional GNU/Linux distributions. A container requires no more than 8 MB and a minimal installation to disk requires around 130 MB of storage.
Alpine Linux is a Linux distribution built around musl libc and BusyBox. The image is only 5 MB in size and has access to a package repository that is much more complete than other BusyBox based images. Read more about Alpine Linux here and you can see how their mantra fits in right at home with Docker images.
Secure. Alpine Linux is a security-oriented, lightweight Linux distribution based on musl libc and busybox.
Alpine Linux is a Linux distribution based on musl and BusyBox, designed for security, simplicity, and resource efficiency. It used a hardened kernel until release 3.8 and compiles all user-space binaries as position-independent executables with stack-smashing protection.
– The default shell in Alpine is the busybox provided ash. As with anything in Alpine, it is also quite minimalistic, and lacks some shell convenience features, such as auto completion. If you're into bash, like myself, simply install the bash apk package, and use it as your default shell.
By default, bash is not included with BusyBox and Alpine Linux. The postmarketOS project, which is designed to run on mobile devices, is based on Alpine Linux. Many Docker images are also based upon Alpine, and you may install bash shell in Docker-based images too.
Docker Build Error: env: can't execute 'bash': No such file or directory. This error is because of the absence of bash shell in the docker container. In-order to fix this error, we need to include command to install bash shell within the Docker file. Then rebuild the docker image and run the container.
Alpine Linux is a security-oriented, lightweight Linux distribution based on musl libc and busybox. What is Debian? The Universal Operating System. Debian systems currently use the Linux kernel or the FreeBSD kernel.
Almquist shell (also known as A Shell, ash and sh) is a lightweight Unix shell originally written by Kenneth Almquist in the late 1980s. Initially a clone of the System V. 4 variant of the Bourne shell, it replaced the original Bourne shell in the BSD versions of Unix released in the early 1990s.
Since you can't 'execute' a directory, the execute bit has been put to better use. The execute bit on a directory allows you to access items that are inside the directory, even if you cannot list the directories contents.
You have two choices:
- Use the correct absolute path to the script: /Users/sh.
- Use the path based on your home directory: ~/test/test_bash_script.sh.
If you make the scrip executable with chmod 755 <nameofscript> to run it you only need to type the path to the script. When you see ./script being used it telling the shell that the script is located on the same directory you are executing it. To use full path you type sh /home/user/scripts/someScript .
