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Linux CommandsArchives & checksums

Create a compressed tar archive

Bundle a directory into a gzip-compressed tar archive, preserving the directory structure.

tar✓ Tested
SQLReporting & grouped calculations

Distinguish row count from non-null value count

SQL: COUNT(*) includes every row while COUNT(column) skips NULL values.

SQL✓ Tested
SQL ServerReporting & grouped calculations

Distinguish row count from non-null value count

SQL Server: COUNT(*) includes every row while COUNT(column) skips NULL values.

SQL Server✓ Tested
PostgresReporting & grouped calculations

Distinguish row count from non-null value count

Postgres: COUNT(*) includes every row while COUNT(column) skips NULL values.

Postgres✓ Tested
SQLiteReporting & grouped calculations

Distinguish row count from non-null value count

SQLite: COUNT(*) includes every row while COUNT(column) skips NULL values.

SQLite✓ Tested
Arduino / CDigital signals & interrupts

Drive the built-in LED low after turning it on

Arduino / C: digitalWrite changes the actual output level of a configured pin.

Arduino / C✓ Tested
PythonText validation & encoding

Extract named regex fields

Python: Use named capture groups to parse a known date-shaped identifier.

Python✓ Tested
Arduino / CDigital signals & interrupts

Generate and measure a short output pulse

Arduino / C: delayMicroseconds can create a short blocking pulse on an output pin.

Arduino / C✓ Tested
SQLBulk changes & set operations

Increment a stored value in the database

SQL: An in-database arithmetic update avoids a separate application read-modify-write step.

SQL✓ Tested
SQL ServerBulk changes & set operations

Increment a stored value in the database

SQL Server: An in-database arithmetic update avoids a separate application read-modify-write step.

SQL Server✓ Tested
PostgresBulk changes & set operations

Increment a stored value in the database

Postgres: An in-database arithmetic update avoids a separate application read-modify-write step.

Postgres✓ Tested
SQLiteBulk changes & set operations

Increment a stored value in the database

SQLite: An in-database arithmetic update avoids a separate application read-modify-write step.

SQLite✓ Tested