Created
May 9, 2024 17:12
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Bash-C Hello World: Compile and run a C program from a single Bash script
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| #!/bin/bash | |
| # bash_c_example.sh | |
| # Directory to store the C source file and the executable | |
| EXAMPLES_DIR="$HOME/bash_c_examples" | |
| # Ensure the directory exists, create it if not | |
| mkdir -p "$EXAMPLES_DIR" | |
| # Check if hello_world.c and hello_world executable already exist | |
| if [[ -f "$EXAMPLES_DIR/hello_world.c" && -x "$EXAMPLES_DIR/hello_world" ]]; then | |
| # Run the existing executable | |
| echo "(Running existing hello_world executable)" | |
| "$EXAMPLES_DIR/hello_world" | |
| else | |
| # Define the C code with "Hello, World!" inside a docstring | |
| CODE=$(cat <<EOF | |
| #include <stdio.h> | |
| int main() { | |
| printf("\\nHello, World!\\n\\n"); | |
| return 0; | |
| } | |
| EOF | |
| ) | |
| # Create a C source file with the defined code in the specified directory | |
| echo "$CODE" > "$EXAMPLES_DIR/hello_world.c" | |
| # Change directory to the examples directory | |
| cd "$EXAMPLES_DIR" || exit | |
| # Compile the C source file using GCC | |
| gcc -o hello_world hello_world.c | |
| # Run the compiled executable | |
| echo "(Running newly compiled hello_world executable)" | |
| ./hello_world | |
| fi |
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make executable:
$ chmod +x bash_c_example.shrun it the first time:
$ ./bash_c_example.shexample output:
run it a second time:
$ ./bash_c_example.sh