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Eric Renouf questions

Eric Renouf answers

• How to efficiently list files that have exactly `n` lines?
• Error: Tar command not found
• Are bitwise operators supported in regular shell /bin/sh (not bash)
• Count total directories and files in all sub directories unix [duplicate]
• Is sed line deletion atomic?
• Execute a shell script with ampersand from a python program
• Generating a sha256 from bash (without echo)
• Get an element from a associative array in bash with set -u
• Is it possible to share a namespace across multiple files
• psql return code if zero rows found