Why Is M In Vim Not Working For Uppercase Marks?

2025-09-03 11:15:38
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5 Answers

Nora
Nora
Favorite read: Mark of an Alpha's Mate
Novel Fan Office Worker
I'm a little obsessive about tiny text tools, so when 'm' misbehaves I start with the simplest checks. Uppercase marks are meant to be global — they remember the filename and position — so the workflow is: in Normal mode type mA to set, then elsewhere use 'A or `A to jump. If m + uppercase letter doesn’t set the mark, the usual culprits are being in the wrong mode, your keyboard/terminal not sending the shifted character, or a mapping in your config/plugin overriding m.

Quick debug steps I run: press Ctrl+V then Shift+letter to verify what Vim receives; run :verbose nmap m to see if something mapped m and where it came from; look at :marks to see active marks; and test in a clean Vim (vim -u NONE) or gVim to rule out your vimrc/plugins. If you're using tmux or a remote terminal, try toggling settings or testing locally because those layers sometimes swallow or transform keystrokes. Often it’s a mapping or terminal quirk, and once you find that, everything’s back to normal.
2025-09-04 16:20:19
22
Grayson
Grayson
Favorite read: Mark me, please
Spoiler Watcher Journalist
I'm pretty sure what's biting you here: uppercase marks in Vim behave differently than the little lowercase ones, and that difference is often the cause of confusion. Lowercase marks (a–z) are file-local, while uppercase marks (A–Z) are global — they store the file name and a position so you can jump between files. To set one you must type m then the capital letter (for example mA). To jump, use 'A (line) or `A (exact position).

If mA doesn't seem to do anything, check a few concrete things. First, are you in Normal mode? m only works there. Second, make sure the keypress is actually reaching Vim: press Ctrl+V then Shift+A in insert mode to see what character the terminal sends. Third, check for mappings that hijack m with :verbose nmap m (or :map m). Plugins or your vimrc can remap m and break the default behavior. Also try :marks to list current marks and see whether the uppercase mark was created but you’re jumping incorrectly. If you use tmux, a terminal emulator, or an SSH connection, those can sometimes interfere with special key handling — try gVim or a different terminal to isolate the problem.
2025-09-07 00:12:02
7
Ruby
Ruby
Favorite read: MARKED
Bookworm Lawyer
Short, practical: uppercase marks (A–Z) are global; set them with mA and jump with 'A or `A. If mA seems dead, first ensure you're in Normal mode. Then check for mappings with :verbose nmap m — plugins sometimes remap m. Also use :marks to confirm whether the mark exists. If the key itself isn't reaching Vim, hit Ctrl+V then press Shift+letter to inspect the raw input. Terminal multiplexers (tmux), remote shells, or weird keyboard layouts can block shifted input. Try running vim -u NONE or gVim to isolate the problem.
2025-09-07 14:23:02
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Aaron
Aaron
Favorite read: MARK
Ending Guesser Veterinarian
Okay, picture this like a boss-fight mechanic: lowercase marks are local minions; uppercase marks are global bosses — you need to hit the right combo (m + capital) to tag them. If m + Shift+letter isn’t tagging the boss, check three things: are you in Normal mode, is the key reaching Vim, and is something remapping m?

I test the key with Ctrl+V then the capital letter to see the literal input. I also run :marks to see what’s already stored and :verbose nmap m to hunt for remaps. If it works in gVim but not in your terminal, tmux or the terminal emulator might be capturing Shift. Swapping terminal or testing with vim -u NONE will usually point to the culprit — once you find it, setting and jumping to uppercase marks feels way more satisfying.
2025-09-08 07:15:22
4
Hazel
Hazel
Careful Explainer Assistant
I used to get tripped up by this until I made a little checklist. Uppercase marks are global: they store the file name and position so you can jump across files, while lowercase marks live only in the current buffer. Setting is m + capital letter (mA); jumping is 'A or `A. If that isn’t working, don’t panic — it’s usually environment or remapping.

Step-by-step I follow: verify mode (Normal), then :marks to see if the mark exists. If it’s absent, I check :verbose nmap m to see if 'm' has been remapped by my vimrc or a plugin and note the file/line that set it. If mapping looks clean, I test raw key input with Ctrl+V + Shift+letter to confirm the terminal sends an uppercase character. If things look odd only in my terminal session, I test with vim -u NONE or gVim; if the mark works there, re-examine terminal/tmux/SSH settings. Fixing the mapping or using a terminal that passes Shift properly usually resolves it, and then marking across files becomes delightfully reliable.
2025-09-09 18:08:26
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What does m in vim do when setting marks?

5 Answers2025-09-03 23:50:50
Whenever I'm deep in a giant source file the 'm' command in Vim is my go-to little bookmark trick. Hit 'm' then a letter (for example 'ma') and Vim records the cursor position as mark 'a'. Lowercase letters a–z create marks that are local to the current file (buffer), so they help me jump around within that one document without affecting other files. If I need to jump back, I use a backtick and the letter (for example ` `a` ) to go to the exact column and line, or a single quote and the letter (for example 'a) to jump to the start of that line. Uppercase letters A–Z store the filename too, so they act like global marks across files in the same Vim session — handy when I hop between multiple modules. You can list marks with :marks and remove them with :delmarks. Small tip: some environments also save marks across sessions if your config writes marks to viminfo, which means your bookmarks can survive a restart if you set it up right.

How do I use m in vim to set a local mark?

5 Answers2025-09-03 11:44:49
Okay, here's a friendly walkthrough that helped me stop losing my place in files: press m followed by a letter to set a mark at the cursor. For example, ma sets mark 'a' right where the cursor sits. Lowercase letters (a–z) are local marks that live in the current file or buffer, which is great when I'm juggling long source files and want to bounce back to a function header. To jump back I use 'a (single quote plus the mark letter) to move to the start of the marked line, or `a (backtick plus the mark letter) to jump to the exact column and line where I set the mark. That difference saved me once when I needed to return to the exact column inside a long JSON object — `a was the hero. If I want to see what marks are set, I type :marks and it lists them. To remove marks I use :delmarks a or :delmarks a b c. Uppercase marks (A–Z) behave a bit differently — they record the file too so you can jump between files in the same session. Small tip: set useful short-named marks for spots you revisit often, like ma for a test stub and mb for a TODO comment; it's saved me tons of time.

Which keys follow m in vim to name a mark?

5 Answers2025-09-03 04:33:35
Okay, here’s the short-and-handy version I keep in my head: to name a mark in Vim you press m plus a letter — m followed by any lowercase a–z or uppercase A–Z. Lowercase marks (like ma) are local to the current file, while uppercase marks (like mA) are global in the sense that you can jump to them from other files in the same Vim session. To jump back you use the quote or backtick: 'a moves you to the start of the line of mark a, while `a moves you to the exact column/position. If you ever need to see what marks exist, :marks lists them. There are also automatic numbered marks (0–9) set by jumps/edits, and handy special marks such as '" (last exit position), '. (last change), '^ (last insert), '< and '> (visual selection bounds). I use marks all the time to hop between functions — it’s like tiny anchors in your code. Pro tip: use :delmarks to remove marks and :help mark for a deeper dive; once you get the habit, navigation becomes delightfully snappy.

Does m in vim support digits or special mark names?

5 Answers2025-09-03 01:44:27
Oh, this one used to confuse me too — Vim's mark system is a little quirky if you come from editors with numbered bookmarks. The short practical rule I use now: the m command only accepts letters. So m followed by a lowercase letter (ma, mb...) sets a local mark in the current file; uppercase letters (mA, mB...) set marks that can point to other files too. Digits and the special single-character marks (like '.', '^', '"', '[', ']', '<', '>') are not something you can create with m. Those numeric marks ('0 through '9) and the special marks are managed by Vim itself — they record jumps, last change, insert position, visual selection bounds, etc. You can jump to them with ' or ` but you can't set them manually with m. If you want to inspect what's set, :marks is your friend; :delmarks removes marks. I often keep a tiny cheat sheet pasted on my wall: use lowercase for local spots, uppercase for file-spanning marks, and let Vim manage the numbered/special ones — they’re there for navigation history and edits, not manual bookmarking.
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