flowchart LR
A(Python) --> B[fname.py file]
B --> C[python fname.py]
C --> D{hello world}
E(C) --> F[fname.c file]
F --> G[gcc fname.c -o ename]
G --> H[./ename]
H --> I{hello world}
Week 0x1
Crypto
podmanvimgccgitwsl --install -d ubuntu command oncewsl to… enter wsl.sudo apt update oncesudo apt upgrade oncesudo apt install podmanpodman commands within WSLpodman machine startpodman machine initpodman-machine-default-arm64.rawpodman run -it is an image
run instances.| Command | Explanation |
|---|---|
podman |
do something with containers |
run |
run a new container |
-d |
detach - we’ll cover this next |
-p |
This is port forward… |
8080:80 |
80 is where websites usually live |
| 8080 is where we went (:8080) | |
docker/... |
Name of an image |
8080:80 to 8083:80-d-d flag, it:
podman commands to:
vimpodman psCONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
7d6af09131b5 docker.io/docker/welcome-to-docker:latest nginx -g daemon o... 2 minutes ago Up 2 minutes 0.0.0.0:8080->80/tcp, 80/tcp confident_darwin
2e1b9f844dcd docker.io/docker/welcome-to-docker:latest nginx -g daemon o... 2 minutes ago Up 2 minutes 0.0.0.0:8083->80/tcp, 80/tcp adoring_shamirpodman ps -a to see old containers./bin/shbash > sh, but sometimes only sh availablerun -it
podman ps:
podman ps -apodman start by namevim:vim
vim, I implicitly exit the container.exit, to mepodmanvimgccgitapt to manage packages, like gcc and vimapt install to… install gcc from apt-y as by default apt asks us if we’re sure-y, apt will wait for us to type
-yi to enter “insert mode”vim terminal emulator
:term: is meaningful in vimgccw to change “window”vim movement key, like j
j moves down one “thing”:w to write the filew+kpodmanls to list files, look for a.out./ prefix to use a.out as an executablepodmanvimgccgitpython is written in GCC Cclang now but that’s newcat, ls, rmpython or podman or vim, GCC is a command - gccgcc takes at least one argument: a filename, usually of a C file./ prefix
python which runs a script without creating a corresponding program.flowchart LR
A(Python) --> B[fname.py file]
B --> C[python fname.py]
C --> D{hello world}
E(C) --> F[fname.c file]
F --> G[gcc fname.c -o ename]
G --> H[./ename]
H --> I{hello world}
gcc has many options
-o specifies the name of the output file-std specifies the C version (there’s a few)-Wall -Wextra -Werror -Wpedantic set warnings - I use all 4-w stop all warnings.-O2 to compile more slowly to make faster code:term and runvim window was tiny and I didn’t want to resize itgcc samp.c --std=c89user@DESKTOP-THMS2PJ:~/crypto/c89_99$ podman exec -it -l gcc samp.c --std=c89
samp.c: In function 'main':
samp.c:5:9: error: C++ style comments are not allowed in ISO C90
5 | // This is a C++ style comment
| ^
samp.c:5:9: note: (this will be reported only once per input file)
user@DESKTOP-THMS2PJ:~/crypto/c89_99$ podman exec -it -l gcc samp.csamp.c: In function 'main':
samp.c:5:9: error: C++ style comments are not allowed in ISO C90
5 | // This is a C++ style comment
| ^
samp.c:5:9: note: (this will be reported only once per input file)
samp.c:3:14: error: unused parameter 'argc' [-Werror=unused-parameter]
3 | int main(int argc, char **argv) {
| ~~~~^~~~
samp.c:3:27: error: unused parameter 'argv' [-Werror=unused-parameter]
3 | int main(int argc, char **argv) {
| ~~~~~~~^~~~
cc1: all warnings being treated as errors-Wall for intro programming classes!int main(int argc, char **argv) {
int i;
/* if (argc < 1) {
return 1;
} */
for (i = 0 ; argv[1][i]; i++) {
argv[1][i] = cipher(argv[1][i], i);
}
printf("%s\n", argv[1]);
return 0;
}int main(int argc, char **argv) {
int i;
for (i = 0 ; argv[1][i]; i++) {
argv[1][i] = cipher(argv[1][i], i);
int i++;
}
printf("%s\n", argv[1]);
return 0;
}const convention-Werror=char-subscriptsint main(int argc, char **argv) {
char i;
for (i = 0 ; argv[1][i]; i++) {
argv[1][i] = cipher(argv[1][i], i);
}
printf("%s\n", argv[1]);
return 0;
}int main(int argc, char **argv) {
char i;
if (argc < 1) {
return 1;
}
char *input_string = argv[1];
for (i = 0 ; argv[1][i]; i++) {
argv[1][i] = cipher(argv[1][i], i);
}
printf("%s\n", argv[1]);
return 0;
}int main(int argc, char **argv) {
char i;
if (argc < 1) {
return 1;
}
char *output_string;
for (i = 0 ; argv[1][i]; i++) {
output_string[i] = cipher(argv[1][i], i);
}
printf("%s\n", argv[1]);
return 0;
}podmanvimgccgitgit
If you want a lot of control and flexibility, you can use the command line.
gitpodmanvimgccgitroot@262ad65a08ba:/# vim build.sh
root@262ad65a08ba:/# ./build.sh
bash: ./build.sh: Permission denied
root@262ad65a08ba:/# chmod 777 build.sh
root@262ad65a08ba:/# ./build.sh
samp.c: In function 'main':
samp.c:5:9: error: C++ style comments are not allowed in ISO C90
5 | // This is a C++ style comment
| ^
samp.c:5:9: note: (this will be reported only once per input file)
samp.c:3:14: error: unused parameter 'argc' [-Werror=unused-parameter]
3 | int main(int argc, char **argv) {
| ~~~~^~~~
samp.c:3:27: error: unused parameter 'argv' [-Werror=unused-parameter]
3 | int main(int argc, char **argv) {
| ~~~~~~~^~~~
cc1: all warnings being treated as errors
root@262ad65a08ba:/# cat build.sh
#!/bin/sh
gcc samp.c --std=c89 -Wall -Wextra -Werror -Wpedantic -O2 -o samp
root@262ad65a08ba:/#