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Small, practical examples. Search by task or narrow things down below.

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PostgresBulk changes & set operations

Copy selected rows into another table

Postgres: INSERT SELECT performs a set-based copy with an explicit destination column list.

Postgres✓ Tested
SQLiteBulk changes & set operations

Copy selected rows into another table

SQLite: INSERT SELECT performs a set-based copy with an explicit destination column list.

SQLite✓ Tested
CStrings

Copy text into a fixed buffer

Use snprintf and check for truncation when copying a C string.

C✓ Tested
GitRestoring & revising local work

Correct the latest unpublished commit message

Git: Amend replaces the current commit while preserving its tree when no new changes are staged.

Git✓ Tested
Arduino / CDigital signals & interrupts

Count a button’s falling edge in the main loop

Arduino / C: Compare each reading with the previous state to detect transitions.

Arduino / C✓ Tested
Arduino / CDigital input & output

Count a falling edge with an interrupt

Increment a counter when an external input changes.

attachInterrupt✓ Tested
CStrings & byte buffers

Count a leading run of allowed characters

C: strspn counts bytes at the start that belong to a specified character set.

C✓ Tested
Arduino / CDigital signals & interrupts

Count a rising edge with an interrupt

Arduino / C: RISING triggers when the input changes from low to high.

Arduino / C✓ Tested
HTMLTables & list numbering

Count an ordered list downward

HTML: The reversed attribute changes the native numbering direction.

HTML✓ Tested
PowerShellGetting Started

Count array elements

PowerShell: Count array elements using PowerShell 7.

PowerShell✓ Tested
Linux CommandsStreams & byte tools

Count bytes in a file

Linux Commands: Use wc -c for byte length rather than Unicode character count.

Linux Commands✓ Tested
GitGetting Started

Count commits on the current branch

Git: Count commits on the current branch inside the disposable repository created by the input setup.

Git✓ Tested