Here's a practical, minimal guide for using GDB in Ubuntu terminal — from launching to setting breakpoints and navigating your code. 🧰 Step 1: Compile with Debug Symbols Use -g and disable optimizations ( -O0 preferred for debugging): bash Copy Edit g++ -g -O0 -o myprog myprog.cpp 🚀 Step 2: Launch GDB bash Copy Edit gdb ./myprog You'll see a (gdb) prompt. 🎯 Step 3: Set Breakpoints You can set breakpoints in three main ways : ✅ a. At a function gdb Copy Edit (gdb) break main ✅ b. At a specific file and line gdb Copy Edit (gdb) break myprog.cpp:42 ✅ c. At a method in a class gdb Copy Edit (gdb) break MyClass::doSomething If the symbol is mangled (C++), GDB usually demangles automatically, especially if compiled with -g . ▶️ Step 4: Run the Program gdb Copy Edit (gdb) run 🧠Step 5: Navigate Command Meaning next or n Step over current line step or s Step into function call finish Run until current function returns continue or c Continue until...
Q: git push origin main; vs gi push -u origin main;
chatGpt:
The difference between `git push origin main` and `git push -u origin main` lies in the `-u` (or `--set-upstream`) flag. Here's what each command does:
### 1. **`git push origin main`**
- This command pushes the `main` branch to the remote repository named `origin`.
- If you've already pushed the `main` branch before, this command will simply update the remote branch with any new commits you've made.
- It **does not** set any upstream tracking information for the branch.
### 2. **`git push -u origin main`**
- This command does the same thing as `git push origin main` (i.e., it pushes the `main` branch to the remote repository named `origin`).
- The `-u` (or `--set-upstream`) flag additionally sets the upstream branch for `main` to `origin/main`. This means that future `git pull` or `git push` commands can be executed without specifying the remote and branch, as Git will automatically use `origin/main` as the default.
- After running `git push -u origin main` once, you can use `git push` or `git pull` without specifying the branch or remote, and Git will know which branch to push to or pull from.
### Example:
#### Without `-u`:
```bash
git push origin main
```
- You will always need to specify `origin` and `main` when pushing or pulling unless you have already set up an upstream branch.
#### With `-u`:
```bash
git push -u origin main
```
- This sets the upstream tracking branch, so in the future, you can simply use:
```bash
git push
git pull
```
### When to Use `git push -u`?
- You typically use `git push -u` the first time you push a new branch to the remote repository.
- Once the upstream branch is set, you can omit the remote and branch names in future `git push` or `git pull` commands.
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