Find files with a specific extension: find . | grep -i "\.tex"
Find directories:
find . \( -type d \)
Find and remove directories:
find . \( -type d \) -exec rm -r {} \;
grep options:
-i case insensitive
-n show line numbers
Example: grep -ni "what I'm looking for" my_file.txt
Use ln -s <file or directory> .
To remove, use rm <file> or rm <directory without the trailing />
unrar x file.rar
Extracts files from file.rar, including the path stored in file.rar
unrar t file.rar
Tests the archive, printing the content of file.rar to standard output.
-v 3 (verbosity)
-i <input filename>
-b:v 1024k (bitrate, bit/s)
-bt 1024k (bitrate tolerance in bits)
-qscale:v 4 (The available qscale values range from 1 (highest quality) to 31 (lowest quality))
-strict -2 (to use the experimental mp4 h264 encoder)
ffmpeg -i <frames-in>_%04d.png -b:v 1024K <video-out>.mp4
ffmpeg -i <video-in>.wmv -b:v 1024K -qscale:v 4 -strict -2 <video-out>.mp4
Converting to png:
ffmpeg -v 1 -i 'myvideo.mp4' 'myimages_%04d.png'
Wether you are working on a Mac (MacOSX), on Windows or Linux, you might want to compress existing pdf files to reduce its file size. Use Ghostscript :
gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/screen -dNOPAUSE -dQUIET -dBATCH -sOutputFile=out.pdf in.pdf
-dPDFSETTINGS=/screen = 72 dpi images
-dPDFSETTINGS=/ebook = 150 dpi images
-dPDFSETTINGS=/printer = 300 dpi images
-dPDFSETTINGS=/default
Common commands:
svn commit
svn update
svn diff -r<revision number> <file>
svn update -r<revision number> <file>
svn add <file>
svn delete <file>
svn move <file before> <file after>
svn info <file>@<revision number>
svn help
svn propedit svn:ignore ./some_path (./ for example), then in the editor, add things like *.class, *.obj, etc. one per line.
svn checkout <your repository url> <directory where to put the files>
optional: --username <your user name>
Git for those who know subversion: http://git.or.cz/course/svn.html
Advice: pull frequently (avoids complex conflict resolution); commit often, commit when changes have been tested.
It is useful to first understand the different states that a file can be into: https://git-scm.com/book/en/v2/Git-Basics-Recording-Changes-to-the-Repository
Works with the hosted repository:
git clone git://<host>/project.git
git pull
git push -u origin master (-u saves the parameters remote 'origin' and the branch 'master')
git push
git reset <filename> (reset a staged file)
git checkout -- octocat.txt
Works with the local repository:
git add
git commit
git rm (removes files on disk and stages it)
git commit -a : Removes files that are no longer on disk. This is an alternative to git rm.
Branches:
git branch <branch name>
git checkout <branch name>
git merge <branch name> (you need to be in the 'parent' branch, for example in the master branch, so git checkout <parent branch>, then git merge <child branch>, and you then need to push your changes, for example with git push origin master
git branch -d <branch name> : deletes the branch
Common commands:
git diff
git diff --staged (diff files not commited yet)
git config --global diff.tool <the software you want to use>
git blame (-w ingnore white space -M ignore moving text) : identifies who modified a line.
Other commands:
git status
git log
git init (in the repository where you want to initialize a repository)
git stash (save current changes to get back to a clean repository)
git stash pop (get back to the save changes)
git stash drop (forget these savec changes)
You added a file as text while it is a binary file? Change it from text mode to binary right inside CVS:
cvs admin -kb yourfile.jpg
cvs update -A yourfile.jpg
Change the command to cvs admin -kkv yourfile.txt to do the inverse modification (binary to ascii). You still need to do cvs update -A yourfile.txt.
Split screen horizontally (C-x 2) or vertically (C-x 3).
Parallel compression of files using multi-core CPUs:
tar --use-compress-program=pbzip2 -cvf test-2-frames.tar.bz2 test-frames