Why Is M In Vim Not Working For Uppercase Marks?

2025-09-03 11:15:38 355
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5 Answers

Nora
Nora
2025-09-04 16:20:19
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.
Grayson
Grayson
2025-09-07 00:12:02
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.
Ruby
Ruby
2025-09-07 14:23:02
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.
Aaron
Aaron
2025-09-08 07:15:22
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.
Hazel
Hazel
2025-09-09 18:08:26
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.
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