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## Name
syscall - test a system call
## Synopsis
```**sh
$ syscall [-o] [-l] [-h] <syscall-name> <args...> [buf==BUFSIZ buffer]
```
## Description
The `syscall` utility can be used to invoke a system call with the given arguments.
## Options
* `-o`: Output the contents of the buffer argument specified as buf to stdout.
* `-l`: Print a space separated list of all the Serenity system calls and exit. Note that not all the system calls can be invoked using this tool.
* `-h`: Print a help message and exit.
## Examples
Write a string to standard output:
```sh
$ syscall write 1 hello 5
```
Read a string from the standard input into a buffer and output the buffer contents to stdout:
```sh
$ syscall -o read 0 buf 3
```
Get the pid of the current running process:
```sh
$ syscall getpid
```
Sleep for 3 seconds:
```sh
$ syscall sleep 3
```
Create a directory:
```sh
$ syscall mkdir my-dir 0755
```
Exit the program with status 2:
```sh
$ syscall exit 2
```
## History
This is a direct port of a utility with the same name originated from the Plan 9 operating system.
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