Sort Shell Symbols by What They Change

Sort each shell feature by the layer it primarily affects. Name or text expansion Stream routing Status-based sequencing Literal protection *.log expands to matching filenames $DEST expands a variable value cmd1 | cmd2 connects stdout to stdin > sends stdout to a file 2>&1 joins stderr with stdout cmd1 && cmd2 runs second command after success cmd1 || recover runs fallback after failure single quotes keep most characters literal double quotes preserve spaces while still allowing variable expansion

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