Useful commands

List of useful commands I looked for, found and figured I'll definitely need them again later.

Shell

Daily Work

View the list of environment variables

printenv | less

Image processing

Resize PNG image and convert it to base64 format for HTML

FILE="YOUR_FILE.png" && sips -Z 32 $FILE && echo "data:image/png;base64,$(cat $FILE | base64)" | pbcopy

Git

Daily Work

View changes about to be committed

git diff --cached

• w/o --cached the diff of ANY changes is shown

Show incoming changes w/o creating a merge conflict

git log -p HEAD..FETCH_HEAD

Statistics

Top 10 touched files in a git repository (by a specific author)

git log --author="vlmaier" --pretty=format: --name-only | sort | uniq -c | sort -rg | head -10

Refactoring

Replace author email in commits

git filter-branch --env-filter '
WRONG_EMAIL="..."
NEW_NAME="..."
NEW_EMAIL="..."

if [ "$GIT_COMMITTER_EMAIL" = "$WRONG_EMAIL" ]
then
    export GIT_COMMITTER_NAME="$NEW_NAME"
    export GIT_COMMITTER_EMAIL="$NEW_EMAIL"
fi
if [ "$GIT_AUTHOR_EMAIL" = "$WRONG_EMAIL" ]
then
    export GIT_AUTHOR_NAME="$NEW_NAME"
    export GIT_AUTHOR_EMAIL="$NEW_EMAIL"
fi
' --tag-name-filter cat -- --branches --tags

Forensics

View project history w/ diffs at each step

git log -p

Search for all occurrences of "..." in any files

git grep "..."

• specify a commit hash after "..." to be more specific

Browse any commits from the last 2 weeks modified files under the . directory

git log --since="2 weeks ago" .

Show file for a particular version

git show [commit|tag]:filename

Show all commits since a specific commit | tag

git log [commit|tag]..

Show any changes matching the string "..."

git log -p -S '...'

Get set of patches between two versions

git format-patch main..feature/test

Show number of commits since it diverged from origin

git log origin..origin/feature/test | wc -l

Show reflog entries for a branch

git log --walk-reflogs branch

• reflog history is only available for the LOCAL repository

Maven

Check for new dependency updates

mvn versions:display-dependency-updates