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To probe star formation processes, we present a multi-scale andmulti-wavelength investigation of the `Snake' nebula/infrared dark cloudG11.11$-$0.12 (hereafter, G11; length $\sim$27 pc). Spitzer images hint at thepresence of sub-filaments (in absorption), and reveal four infrared-darkhub-filament system (HFS) candidates (extent $<$ 6 pc) toward G11, wheremassive clumps ($>$ 500 $M_{\odot}$) and protostars are identified. The$^{13}$CO(2-1), C$^{18}$O(2-1), and NH$_{3}$(1,1) line data reveal a noticeablevelocity oscillation toward G11, as well as its left part (or part-A) aroundV$_{lsr}$ of 31.5 km s$^{-1}$, and its right part (or part-B) around V$_{lsr}$of 29.5 km s$^{-1}$. The common zone of these cloud components is investigatedtoward the center's G11 housing one HFS. Each cloud component hosts twosub-filaments. In comparison to part-A, more ATLASGAL clumps are observedtoward part-B. The JWST near-infrared images discover one infrared-dark HFScandidate (extent $\sim$0.55 pc) around the massive protostar G11P1 (i.e.,G11P1-HFS). Hence, the infrared observations reveal multiple infrared-dark HFScandidates at multi-scale in G11. The ALMA 1.16 mm continuum map shows multiplefinger-like features (extent $\sim$3500-10000 AU) surrounding a dustyenvelope-like feature (extent $\sim$18000 AU) toward the central hub ofG11P1-HFS. Signatures of forming massive stars are found toward the center ofthe envelope-like feature. The ALMA H$^{13}$CO$^{+}$ line data show two cloudcomponents with a velocity separation of $\sim$2 km s$^{-1}$ toward G11P1.Overall, the collision process, the ``fray and fragment'' mechanism, and the``global non-isotropic collapse'' scenario seem to be operational in G11.

Galactic `Snake' IRDC G11.11$-$0.12: a site of multiple hub-filament systems and colliding filamentary clouds