To ignore all files larger than 100MB:

find ./* -size +100M | cat >> .gitignore

To ignore all files larger than 100MB but with pathnames not contianing “data” and without repeating already added large file names:

find ./*work*/ -not -path **data**  -size +100M | sed 's|^\./||g' | cat >> .gitignore; awk '!NF || !seen[$0]++' .gitignore

An Example .gitignore file with other useful settings:

  GNU nano 2.9.3                                           .gitignore

# Blocklist files/folders in same directory as the .gitignore file
/*
*data/*
*work*/*data*/*
*gh18-work/models/*
*gh18-work/results/*

# Includelist some files
!.gitignore
!README.md
!**.sh

# Ignore all files named .DS_Store or ending with .log
**/.DS_Store
**.log

# Includelist folder/a/b1/ and folder/a/b2/ trailing "/" is optional for folders, may match file though. "/" is NOT
# optional when followed by a *
!*work*/
!*work*/*

# Adding to the above, this also works...
#!/folder/a/deeply /folder/a/deeply/* !/folder/a/deeply/nested /folder/a/deeply/nested/*
#!/folder/a/deeply/nested/subfolder

# Ignore all files larger than 150MB
g2net-work/g2net-detecting-continuous-gravitational-waves.zip
mlgwsc-work/injections4_1.25s.npy
mlgwsc-work/real_noise_file.hdf


# ==========================================
# LaTeX Core Auxiliary Files
# ==========================================
*.aux
**/*.aux
*.log
*.out
**/*.out
*.toc
*.lof
*.lot
*.fls
*.fdb_latexmk
*.synctex.gz
*.synctex(busy)
*.xdv
*.dvi

# ==========================================
# Bibliography (BibTeX / Biber)
# ==========================================
*.bbl
*.bcf
*.blg
*-blx.bib
*.run.xml
*.brf

# ==========================================
# Beamer Presentation Temp Files (if applicable)
# ==========================================
*.nav
*.snm
*.vrb

# ==========================================
# Output Documents
# ==========================================
# Note: Comment these out if you want to track final compiled PDFs
*.pdf
**/*.pdf

# ==========================================
# Python & Data Scripts
# ==========================================
__pycache__/
*.py[cod]
*$py.class
.ipynb_checkpoints/

# ==========================================
# OS Specific & Editor Temp Files
# ==========================================
.DS_Store
**/.DS_Store
.AppleDouble
.LSOverride
Icon

# IDEs and Text Editors
.vscode/
.idea/
*.swp
*.swo
*~

Useful links: